WEBVTT

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They say an Englishman's home
is his castle. And this is mine.

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Some say it's a bit on the big
side for one person, but...

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Well, it's somewhere to lay my head.

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Yes, I'm just a regular guy
living in a standard gaff,

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leading an ordinary existence

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and struggling to answer
all of life's big questions.

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Like, why can't I feed the dog
while relaxing in the garden?

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Is it possible for me to
boil the kettle while I perform

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my morning ablutions?

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And why can't I cook my sausages
while writing my memoirs?

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I'm sure there are neat but dreary
digital solutions available,

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but who wants to do this...

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...when you can do this?

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It's just better.

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So I'm holding
a knockout tournament...

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This already feels dangerous.

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...where teams
of amateur engineers...

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...will compete
to perform my ordinary chores

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in extraordinary ways.

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Love it when a plan comes together.

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With chain reaction machines.

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Crazy contraptions
made famous by viral videos

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that involve linking up
everyday objects to magical effect.

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Chain reaction guru Zach Umperovitch
is the fearsome judge.

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That had better work perfectly
the first time.

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Oh, you stupid thing!

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Dr Shini Somara will reveal
the science inside the machines.

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And at the end of it all,
one team will be crowned

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chain reaction champions.

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It's a dilemma
as old as time itself.

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You're sitting comfortably

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watching your favourite TV show,
and then it hits you.

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You promised to water the plants.

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It's a prospect
too awful to comprehend.

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But could ingenious engineering
save the day?

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Is it possible to keep the garden
hydrated without leaving the sofa?

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To find out, I'm relying on

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three science-mad brothers and a
trio of physics-obsessed students

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arriving at one of my
many outbuildings.

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I may be eccentric,
but I'm not completely mad.

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I'm not letting the teams in here.

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Instead, I've given each team
a set of rooms just like mine,

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and workshops
I've packed with everyday objects

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for them to use in their builds.

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Target. Frying pans.

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Who knew?

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They've got three days.

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On day one, their machines
need to start at my comfy TV chair

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and travel to the door
into my kitchen.

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Then on day two, they need to cross
my kitchen and reach the garden.

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And on day three,
they need to go through my garden

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and water the plants.

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So I would say let's start with the
beginning. How do we start it,

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and maybe think about
how we're going to end it, too.

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Oh, good. A sensible plan like that

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will hopefully impress
our expert judge.

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Zach Umperovitch is a two-time chain
reaction machine world record

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holder, creator of some of the most
ambitious machines ever built.

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And I flew him all the way
from America just to help me out.

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I just love chain reaction machines,

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the absurd, cartoonish
nature of them.

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They're started by human touch,
but then each individual object

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triggers one after the other
until the task is solved.

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Some of my machines take weeks,
even months, to build,

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but we've asked our teams
to build them in just three days.

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A lack of common sense
may just be what we need

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in this challenge. Oh!

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The first hopefuls
are the Bueno Brothers.

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Enrique, Javi and Ruben, three
brothers originally from Spain.

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We've kind of sort of grown up
all over the place, really.

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Since we were really young,
we travel led together.

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We're kind of like our best
friends, in a way.

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I'm the best at reaching
tall places.

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He's the best at being, like,
sociable, and he's the prettiest.

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They're science obsessives

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who volunteer at technology
workshops at their old college.

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You can do it, mate, come on.
That's the one.

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When us three put our heads
together, we can come up with some

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very good things.

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Not just good things.
Out of the box things.

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Good job, GUYS-

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I'll play you some tunes, Harry.

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Making a racket.

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I can't remember, I'll be honest.

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These brothers are getting on
like a house on fire.

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Well, that's worth knowing.

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And they're already inspired

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by my priceless
— sorry, worthless — table.

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This table folds. This is, like,
something that we can use, like...

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That was louder
than I thought it would be.

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Where do you want me
to measure from?

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And, oh, great. Their rivals are
destroying my stuff, too.

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There's a shelf in there. ls there?

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Devising a way to collapse
my TV cabinet and fire out a ball.

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It all falls, but it does something.

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Meet the Young Physicists
from Leeds, 17 and 18-year-old

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overachievers
Olivia, Leon and Ivana.

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We all did physics
and we're in the same class.

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Leon is really good at not taking
orders, which sometimes

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is a good thing, because...
Sometimes it's annoying.

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OK, I'll give you that.

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Ivana listens. I just listen
and then I fail to do it.

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I do it, but I just
don't do it correctly.

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Olivia's good at finding
solutions very, very quick.

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She is very, very bossy.

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She never lets us breathe.
She never lets us speak.

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All right, OK, calm down.

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But she can have a moments
of being quite relaxed with things,

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I'd say. Once every blue moon.

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I'll take that. I'll take that.

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See, I don't know whether
it'd be easier to cut with a saw

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or just break it with my knee.
Saw, come on.

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Well, we know who's in charge, then.

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Hello, team. Hello. Hello.

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How are you feeling? Yeah, good.

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Planning? Yes. It's a thing.

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Objects. Have you narrowed it down?

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Your TV. My TV? Yeah.

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Is it going to get hurt? Oh... Yeah.

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It depends how hard
someone throws something.

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Someone throws something. Yes.

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You'll find out what it is.

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Am I going to witness any surgical
precision at any point in your build?

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Oh, yeah. Yeah, we're doing it
to at least one decimal place.

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Who's the perfectionist?

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And stress head.
So you get stressed? Yeah.

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So they don't
have to. They still

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do, but it just
comes out in rage.

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So I'll be polite to Olivia, then.

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Their plan is to start by throwing a
remote at the door of my TV cabinet,

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which will trigger a mallet

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to collapse the shelf
and release the ball.

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In the middle, they want
a turntable to work as a pulley

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and lift a weight,

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and they want to end by using tubing
to send a ball into a bucket

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that will somehow enter my kitchen.

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Sounds promising, but each
element and each of them

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needs to work together.

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I've not been the most useful member
of the team. I'll say that much.

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Yes, case in point.

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Leon's making a bracket
so the mallet can collapse

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the shelves while Olivia and Ivana
decide how it should be fixed.

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Oh, you know, those two over there
actually creating the machine.

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Meanwhile, I'm over here
just trying to make things

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that end up being pretty much
null and void

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by the time I get over there.

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They're also not exactly the
best-looking things in the world,

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as you can probably tell.

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What's this, our parts?

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Well, what I've made.

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Oh, making things.

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So this is now going to
hit a mousetrap, which is going

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to open the door.

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Very exciting.

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Well, that was awkward.

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Over with their rivals, there's
brotherly love in the hair.

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I mean air.

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I'll talk about my problems.
So when did it all start?

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When I was young.

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I think it's time
for me to join the family.

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Chaps? Hello!

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So you've had a bit
of a think already. Plans?

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So we're going to start
it off in the chair,

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and then we're going to go to TV.

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Then we're going to go to a table.
That sets off the piano.

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We want to get a hammer smashing
down on the piano and then hopefully

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that sets off the chain reaction.

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Destruction.
I'm going to use that word.

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I mean, I think we would
have gone more for mayhem.

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And this is exactly
why I didn't want this lot

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in my real house.

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They'll start with a run of picture
frame dominoes that knock weights,

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causing the TV cabinet door
to open.

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In the middle,
a string attached to the door

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sets off a domino run on the table,

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which causes a skateboard to fall,
making the table collapse.

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Then a string from the table
releases a boot

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that smashes onto the piano keys.

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Right now they haven't got
a way to end the machine

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and enter the kitchen.

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Javi is rigging
the tricky collapsing table.

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So we've secured
this T with bungees,

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and the only thing keeping them
there is the little piece of wood

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that I fastened in there.
So once I pull it...

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It doesn't work
the way I wanted it to.

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It's OK. Part of the process.

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But in theory that should happen.

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There's a bit too much friction
with the carpet, so we'll get there.

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Speaking of friction...

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Have I just wasted my time on that?

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No, because we still need...
We still that to move.

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What's going to happen
is that's going to get hit,

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and then the hammer
is going to swing the latch.

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The Young Physicists have finished
their collapsing TV cabinet...

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Leon's mood?

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I think he's feeling
a bit useless, but he's not.

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...and are starting on
the fiddly middle stage,

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a record player they hope
has enough power to lift a weight.

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We'll tie a string to one of these,

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and then that will pull something up
on a pulley. That works really well.

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Really, really well. Meanwhile...

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Success!

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...a load of cobblers.

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Bro, can you find me
two small *s?

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Find a * for a man,
he'll * once.

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Find a man a box of *s...
He's got *s for ever.

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So, Zach, I have already seen

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a rolling pin
being inserted into a boot,

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three ducks falling into a piano...

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Do you have a spare rubber duck?

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...and a lethal table?

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Kind of the crux of all
that is the duck cascade. What?

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It's like dominoes, where
you have the boot falls down,

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it triggers a key on the piano
that then pulls the first duck,

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then causing the next duck to get
pulled, and then so on and so forth.

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There you go!

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The Young Physicists in blue.
How far advanced are they?

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I saw them ruining a record
with some bolts.

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It comes off really easily
because of the bolt.

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I'd say they're a little
behind at the moment.

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Watching with that record,
they're making a wheel and axle

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that winds a string
and causes the next reaction.

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But if something doesn't go
according to plan, you wonder

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if they have a backup plan.

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Trust me, I've been in this
situation countless times.

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My method is fix it,
redesign it or scrap it.

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Don't move forward
until you know something works.

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Well, they're all armed
with power tools.

00:11:03.059 --> 00:11:05.723
I don't see how this can go wrong.

00:11:05.748 --> 00:11:10.284
The teams now have four hours until
testing their living room machines.

00:11:10.309 --> 00:11:12.084
Not quite how
I was planning it to go.

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The Bueno Brothers need
to give their machine an end.

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What have you done to this?

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While the Young Physicists are
working on joining their TV cabinet

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at the start to the record.
player in the middle

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Having it go round. Why don't we do
the whole like ramp table idea?

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Just hold it, like, up-ish.

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So we make it so that it
would be level when it's up. Mm-hm.

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They want to prop the table
at an angle, then knock

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it down with the ball that flies
from the TV cabinet.

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This should topple a candlestick
that pulls a string,

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switching on the record player.

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It just missed it.

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How long have we got?

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You have one hour left. One hour.

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The Bueno Brothers are rushing with
a new, ridiculously ambitious plan

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to end their machine
with a whole new door.

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Potentially a tad tall.

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A good time for me to arrive. Yeah.

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Do you want to help us kick in the
door? It's smaller than the hole.

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So, tiny tap, tiny_ tap,
tiny tap, tiny tap, tmy tap-

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Yeah. How's it going otherwise?

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The collapsing piano panel
will release a string joined

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to a hammer that will swing down
and knock the door to the floor.

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Look down.
Look down, close your eyes.

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So all we have to do now is attach
the hammer to the piano somehow.

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But the panel doesn't have the
strength to hold the hammer up.

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No matter how we do it,

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the weight from the rope is just
going to want to pull it forward.

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It's not enough grip. No.

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We don't have time.

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I don't wish to spread
panic and alarm,

00:12:48.389 --> 00:12:51.164
but you have 15 minutes left.

00:12:51.189 --> 00:12:53.044
Just do a granny knot.
It's not hard.

00:12:53.069 --> 00:12:55.014
The Young Physicists have discovered

00:12:55.039 --> 00:12:58.404
a balloon filled with rice
is all my record player can lift.

00:12:58.429 --> 00:12:59.803
Hey!

00:12:59.828 --> 00:13:03.524
And it turns out to be the perfect
way to knock a ball onto a bucket

00:13:03.549 --> 00:13:05.164
resting on a mousetrap.

00:13:05.189 --> 00:13:06.524
(50, go, go, go, go.

00:13:06.549 --> 00:13:08.124
The brothers have ditched the idea

00:13:08.149 --> 00:13:10.654
of holding the hammer up
with string.

00:13:10.679 --> 00:13:12.654
We haven't had time to test that.

00:13:12.679 --> 00:13:16.483
So they're propping it with a cane
that the string should yank out.

00:13:19.508 --> 00:13:25.014
You have five, four,
three, two, one...

00:13:25.039 --> 00:13:26.860
Stop building, tools down.

00:13:26.885 --> 00:13:29.718
That's not going to work.
I can feel it in my bones. OK.

00:13:29.743 --> 00:13:32.949
So not much confidence after
their first day building, then.

00:13:32.974 --> 00:13:36.149
The Bueno Brothers will test
their living room machine first.

00:13:37.664 --> 00:13:39.509
This is it. How are you feeling?

00:13:39.534 --> 00:13:41.798
Nervous? You've gone really quiet!

00:13:41.823 --> 00:13:43.109
Yeah!

00:13:43.134 --> 00:13:46.899
A TV cabinet should trigger
the tricky collapsing table.

00:13:46.924 --> 00:13:50.869
A boot should smash into the piano,
triggering a duck cascade.

00:13:50.894 --> 00:13:54.109
And with any luck, a string
should release the hammer

00:13:54.134 --> 00:13:55.639
and smash down the door,

00:13:55.664 --> 00:13:58.949
ready to set off tomorrow's
contraption in the kitchen.

00:13:58.974 --> 00:14:00.999
Right, well, if we're all set?

00:14:01.024 --> 00:14:04.159
Commence testing in your own time.

00:14:04.184 --> 00:14:05.869
Come on, man. No pressure.

00:14:16.613 --> 00:14:19.159
Nnnn... Nope.

00:14:19.184 --> 00:14:20.519
It's stopped!

00:14:21.934 --> 00:14:23.269
It's a tragedy.

00:14:23.294 --> 00:14:27.749
Despite the dominos releasing
the skateboard, the table failed.

00:14:27.774 --> 00:14:32.109
Some tape came loose underneath, so
the wood block wasn't pulled free,

00:14:32.134 --> 00:14:34.189
preventing the table's collapse.

00:14:34.214 --> 00:14:37.029
It's the first time
that's not triggered.

00:14:37.054 --> 00:14:40.269
Listen. It went very well
up to the point where it stopped.

00:14:40.294 --> 00:14:43.439
I'm going to say busy day tomorrow.

00:14:43.464 --> 00:14:46.389
The Young Physicists' test
run should see a ball fall

00:14:46.414 --> 00:14:48.718
from the collapsing TV cabinet.

00:14:48.743 --> 00:14:51.439
A falling candlestick should
switch on a record player

00:14:51.464 --> 00:14:52.668
to lift a balloon.

00:14:52.693 --> 00:14:57.029
And a ball should fall down a tube
and knock a bucket off a mousetrap.

00:14:57.054 --> 00:14:58.629
Simple, then.

00:14:58.654 --> 00:15:00.959
Young Physicists,
how are you feeling?

00:15:00.984 --> 00:15:02.109
Anxious. Anxious.

00:15:02.134 --> 00:15:04.468
I wish you success. Begin.

00:15:04.493 --> 00:15:07.159
Right, let's do it. Go. Yeah, fire.

00:15:13.823 --> 00:15:16.159
Well, that wasn't supposed
to happen. Hold on.

00:15:16.184 --> 00:15:18.598
What's happened there?
The lamp has come to bits.

00:15:18.623 --> 00:15:21.678
Can we just see what would have
happened if it hadn't got stuck?

00:15:23.344 --> 00:15:25.079
Yeah. There you go, look.

00:15:26.623 --> 00:15:28.829
Well, the last part worked.

00:15:34.904 --> 00:15:37.598
It would have worked. So there was
only one mistake in there.

00:15:37.623 --> 00:15:39.959
Well done, team.
That was a good day's work.

00:15:39.984 --> 00:15:43.399
The machine started perfectly,
but among the carnage, we can see

00:15:43.424 --> 00:15:45.359
a snapped lamp stand.

00:15:45.384 --> 00:15:48.399
It broke as it fell,
and the top part snagged

00:15:48.424 --> 00:15:51.678
the string the record player
was supposed to pull.

00:15:51.703 --> 00:15:54.079
I think what let us down was
we weren't working as a team

00:15:54.104 --> 00:15:56.468
at the start,
everybody was doing their own thing.

00:15:56.493 --> 00:15:58.829
And when it came together,
it just never worked.

00:15:58.854 --> 00:16:01.728
We know where it went wrong, and it
was just a piece that malfunctioned.

00:16:01.753 --> 00:16:03.439
So, a tough first day.

00:16:03.464 --> 00:16:05.728
I'm sure they'll be better tomorrow.

00:16:05.753 --> 00:16:06.879
Hopefully?

00:16:12.324 --> 00:16:15.049
Welcome back to my little bolthole.

00:16:15.074 --> 00:16:18.939
I've asked two teams of engineering
enthusiasts to build chain reaction

00:16:18.964 --> 00:16:22.729
machines that will allow me to water
the plants without missing a second

00:16:22.754 --> 00:16:24.768
of my favourite TV show.

00:16:24.793 --> 00:16:28.169
Yesterday, both teams failed
to make machines that cross

00:16:28.194 --> 00:16:29.729
my replica living room.

00:16:32.554 --> 00:16:34.838
Well, that wasn't
supposed to happen!

00:16:34.863 --> 00:16:36.449
But I'm not giving up on them.

00:16:36.474 --> 00:16:38.809
Today, my rivals need to make
new machines

00:16:38.834 --> 00:16:42.379
that cross my kitchen, and to add
a little splash of excitement,

00:16:42.404 --> 00:16:44.169
I've got a surprise.

00:16:44.194 --> 00:16:45.529
Morning, teams.

00:16:45.554 --> 00:16:49.049
Today, I want you to incorporate
a specific scientific principle

00:16:49.074 --> 00:16:50.848
into your machine.

00:16:50.873 --> 00:16:53.529
Archimedes' principle of buoyancy.

00:16:53.554 --> 00:16:55.129
Doesn't matter how you do it,

00:16:55.154 --> 00:16:57.129
but you've got to build
it into your machine.

00:16:57.154 --> 00:16:58.579
Good luck. Carry on.

00:16:58.604 --> 00:17:00.529
You're going to do brilliantly.

00:17:00.554 --> 00:17:03.459
You're going to witness
my insane drawing skills.

00:17:03.484 --> 00:17:05.169
It's a duck!

00:17:05.194 --> 00:17:06.968
It's a gorgeous duck.

00:17:06.993 --> 00:17:09.659
Archimedes' principle of buoyancy
is an object that floats

00:17:09.684 --> 00:17:13.299
will displace more or the same
weight as itself in water.

00:17:13.324 --> 00:17:15.249
I certainly believe him.

00:17:15.274 --> 00:17:17.299
That goes up. Pulley goes down.

00:17:17.324 --> 00:17:21.739
But while the teams decide how
much mess they'll have to clear up,

00:17:21.764 --> 00:17:26.659
here's Dr Shini, who's going to dive
a little deeper into buoyancy.

00:17:26.684 --> 00:17:27.739
You're welcome.

00:17:29.234 --> 00:17:33.539
Archimedes' principle of buoyancy
is the reason all ships float.

00:17:34.964 --> 00:17:39.329
This aluminium boat scale model
has a big volume because it's got

00:17:39.354 --> 00:17:41.819
a large surface area
and it's got high walls.

00:17:41.844 --> 00:17:46.218
So when I put it on the water,
it floats because there are buoyant

00:17:46.243 --> 00:17:49.848
forces pushing it up because
it's displacing large amounts

00:17:49.873 --> 00:17:52.609
of water
because of its huge footprint.

00:17:52.634 --> 00:17:54.018
And Leon's right.

00:17:54.043 --> 00:17:56.329
The displacement of water is key.

00:17:56.354 --> 00:18:00.209
Any object will float if the mass
of water it displaces is greater

00:18:00.234 --> 00:18:02.179
than its own mass.

00:18:02.204 --> 00:18:06.049
I could even add weights
to this little aluminium foil boat.

00:18:06.074 --> 00:18:09.409
You can actually see that it's
starting to displace even more water

00:18:09.434 --> 00:18:11.459
as it gets heavier and heavier.

00:18:11.484 --> 00:18:14.939
And because a greater mass of water
has been displaced, the boat

00:18:14.964 --> 00:18:17.459
still floats despite weighing more.

00:18:18.844 --> 00:18:21.409
And that's the basis
of Archimedes' principle.

00:18:24.964 --> 00:18:26.939
And all that got me thinking.

00:18:26.964 --> 00:18:30.459
There are many places in the show
where I could make a joke about

00:18:30.484 --> 00:18:32.978
one of the teams
having a sinking feeling.

00:18:33.003 --> 00:18:34.768
Vegetables float, don't they?

00:18:34.793 --> 00:18:38.539
But it's not dis place, because
dis place is where the Young

00:18:38.564 --> 00:18:41.179
Physicists seem quite confident
in how they're going

00:18:41.204 --> 00:18:43.049
to embrace displacement.

00:18:43.074 --> 00:18:44.539
Does it float? No.

00:18:44.564 --> 00:18:47.179
A dropped vegetable
will cause a jar to overflow.

00:18:48.364 --> 00:18:51.619
They plan to catch
the displaced water in a bucket.

00:18:51.644 --> 00:18:55.018
This will sit on a seesaw,
which tips as it gets heavier,

00:18:55.043 --> 00:18:57.978
triggering a pulley
to leave the kitchen.

00:18:58.003 --> 00:18:58.978
Big potato.

00:19:00.334 --> 00:19:01.819
Wahey!

00:19:01.844 --> 00:19:04.129
It sort of worked.

00:19:04.154 --> 00:19:07.209
And then that goes down...
Into a different container? Yeah.

00:19:07.234 --> 00:19:09.778
Well, this is a first.
They all seem to agree.

00:19:09.803 --> 00:19:11.309
It's a team effort.

00:19:11.334 --> 00:19:14.419
I think it works better that way,
because it didn't work yesterday

00:19:14.444 --> 00:19:18.379
when I was sort of being in charge
and telling people what to do.

00:19:18.404 --> 00:19:20.739
As they say, there's no "|" in team.

00:19:20.764 --> 00:19:22.459
Or in submerged potato.

00:19:23.594 --> 00:19:26.819
So I think we'll definitely
need to start half—filled.

00:19:26.844 --> 00:19:29.848
The Bueno Brothers are doing
it differently, embracing

00:19:29.873 --> 00:19:34.569
how an object floats if it's lighter
than the water it displaces.

00:19:34.594 --> 00:19:38.978
The plan is to use a vegetable
basket to tip a watering can,

00:19:39.003 --> 00:19:43.459
which fills a bucket
causing a glass jar to float up,

00:19:43.484 --> 00:19:47.059
which through a pulley, makes
a teacup fall onto a mouse trap

00:19:47.084 --> 00:19:50.949
and trigger the currently
unknown next stage.

00:19:50.974 --> 00:19:54.259
But are you sure it's going to
produce enough force? I think so.

00:19:54.284 --> 00:19:55.589
That should be fine.

00:19:55.614 --> 00:19:58.778
With two hours gone
and buoyancy stages under way,

00:19:58.803 --> 00:20:01.569
the teams can start fixing
yesterday's issues

00:20:01.594 --> 00:20:04.179
and think about
how to join their living room

00:20:04.204 --> 00:20:06.028
machines to the kitchen.

00:20:06.053 --> 00:20:08.858
Zach, both teams arrived this
morning with things to put right

00:20:08.883 --> 00:20:10.419
from yesterday's test.

00:20:10.444 --> 00:20:11.749
Have they? Absolutely.

00:20:11.774 --> 00:20:13.619
Today they're doing much better.

00:20:13.644 --> 00:20:16.419
The Bueno Brothers have corrected
the issue with the table.

00:20:16.444 --> 00:20:19.259
They fixed their spring mechanism,
and I believe that's going to fall

00:20:19.284 --> 00:20:20.579
much more accurately now.

00:20:20.604 --> 00:20:23.309
The Young Physicists,
they had that issue with the lamp

00:20:23.334 --> 00:20:25.699
on which they've now *ed
it in place and made

00:20:25.724 --> 00:20:27.108
it much more stable.

00:20:27.133 --> 00:20:29.978
But both have so far really
incorporated that scientific

00:20:30.003 --> 00:20:31.619
principle we've given to them.

00:20:31.644 --> 00:20:34.339
And both are using something
that I think is a bread and butter,

00:20:34.364 --> 00:20:35.858
a staple of chain reactions.

00:20:35.883 --> 00:20:37.309
And that's the pulley.

00:20:37.334 --> 00:20:40.669
Oh, good. Zack's cobbled together
one of his demos again.

00:20:40.694 --> 00:20:44.108
So what we have here is
a demonstration of pulleys.

00:20:44.133 --> 00:20:46.405
And you reckon the guys
are starting to use pulleys

00:20:46.429 --> 00:20:48.549
sensibly out there as they
get across the kitchen?

00:20:48.574 --> 00:20:51.028
Absolutely. The Bueno Brothers
are using pulleys in order to

00:20:51.053 --> 00:20:53.059
demonstrate
their buoyancy principle.

00:20:53.084 --> 00:20:56.339
The other team is using pulleys
to get from one room to the other,

00:20:56.364 --> 00:20:59.028
and I believe they're going to
use that as a pendulum system.

00:20:59.053 --> 00:21:00.499
So pulleys.

00:21:00.524 --> 00:21:03.629
Well, both of these teapots,
the exact same weight.

00:21:03.654 --> 00:21:04.858
Go ahead. Give it a pull.

00:21:04.883 --> 00:21:07.549
Pull the string? Honestly, I can't.

00:21:07.574 --> 00:21:09.309
It's incredibly difficult. Right.

00:21:09.334 --> 00:21:11.669
As this rope is going
through these eye hooks,

00:21:11.694 --> 00:21:13.579
there's been friction
added to the system.

00:21:13.604 --> 00:21:15.955
Yeah, you can see where it's
sort of pinching and rubbing

00:21:15.980 --> 00:21:17.266
and it doesn't want to move.

00:21:17.291 --> 00:21:20.161
Whereas a pulley transfers that
energy ever so nicely.

00:21:20.186 --> 00:21:22.080
And that's easier to lift? Mm-hm.

00:21:22.105 --> 00:21:25.721
And the point of that, cutting down
the friction using those pulleys

00:21:25.746 --> 00:21:28.880
that means the input,
the transition before this,

00:21:28.905 --> 00:21:31.960
it's going to have to be enormous
effort to make that happen,

00:21:31.985 --> 00:21:33.721
whereas that needs something slight.

00:21:33.746 --> 00:21:36.281
This could be just the simplest ball
falling off of the table.

00:21:36.306 --> 00:21:38.801
This could be a rat trap that
triggers this and just pulls it up

00:21:38.826 --> 00:21:40.880
and pours this... That went well.

00:21:40.905 --> 00:21:44.321
That went really well. Zach failed,
everybody. Something fell off.

00:21:44.346 --> 00:21:47.880
Just it's important for them
to know you're human. I know.

00:21:47.905 --> 00:21:51.441
Encouraging words from the maestro,
but it's not all good news.

00:21:51.466 --> 00:21:54.241
Umbrellas inside is bad luck,
you know.

00:21:54.266 --> 00:21:58.241
Teams, it's my responsibility to let
you know you are halfway through.

00:21:58.266 --> 00:21:59.911
Five hours to go.

00:21:59.936 --> 00:22:02.521
We're going to be building
a slingshot.

00:22:02.546 --> 00:22:06.321
We want to make fruit fly
from the middle of the room

00:22:06.346 --> 00:22:07.471
up until the garden.

00:22:07.496 --> 00:22:10.441
With only buoyancy stages
and a few pulleys under way,

00:22:10.466 --> 00:22:13.161
both teams need to create
the rest of their machines.

00:22:13.186 --> 00:22:15.830
Are we still going to pivot this?

00:22:15.855 --> 00:22:19.191
The Young Physicists are starting
with a swinging bottle, sending

00:22:19.216 --> 00:22:23.161
a ball down my cabinet drawers,
hitting some food box dominoes.

00:22:23.186 --> 00:22:27.551
Next, the dominoes release a cabbage
held by a string on a latch, causing

00:22:27.576 --> 00:22:30.010
a watermelon to roll down
an ironing board.

00:22:30.035 --> 00:22:34.401
This tips over a bottle of acetone,
burning a hole in a polystyrene

00:22:34.426 --> 00:22:39.161
plate that releases a ball and sets
off their final buoyancy stage.

00:22:39.186 --> 00:22:41.121
OK, then!

00:22:41.146 --> 00:22:43.401
They're finishing their pulley...

00:22:43.426 --> 00:22:44.760
And of course it doesn't go.

00:22:44.785 --> 00:22:47.601
...which causes the falling bucket
in the living room

00:22:47.626 --> 00:22:50.161
to lift a bottle that swings.

00:22:50.186 --> 00:22:51.481
Well, it's half there,

00:22:51.506 --> 00:22:54.241
and obviously the string did
hold it back a little bit. Yeah.

00:22:54.266 --> 00:22:57.090
But the Bueno Brothers
aren't being left behind.

00:22:57.115 --> 00:22:59.840
We won't clamp the door like that.

00:22:59.865 --> 00:23:03.481
The spoon is a bit of a seesaw
that is going to activate

00:23:03.506 --> 00:23:06.321
once it's hit by the dropping door.

00:23:06.346 --> 00:23:10.401
The spoon seesaw will release a
basket of pool * when struck

00:23:10.426 --> 00:23:12.760
by the falling door
from the living room.

00:23:12.785 --> 00:23:16.090
Quickly, because we're running out
of time. The rest is mostly done.

00:23:16.115 --> 00:23:19.811
The plan for the Bueno Brothers'
kitchen machine is for pool *

00:23:19.836 --> 00:23:23.041
to trigger a cascade of limes
that set off a mousetrap,

00:23:23.066 --> 00:23:25.371
causing a butternut squash to fall.

00:23:25.396 --> 00:23:27.760
Via a pulley,
this lifts a vegetable basket

00:23:27.785 --> 00:23:29.760
that sets off the buoyancy stage.

00:23:29.785 --> 00:23:33.681
Next, the mousetrap tugs a wire,
releasing a cabbage that fires

00:23:33.706 --> 00:23:35.640
a slingshot into the garden.

00:23:35.665 --> 00:23:38.601
It's got all the charm
of a school canteen food fight,

00:23:38.626 --> 00:23:40.840
but hopefully more precision.

00:23:42.586 --> 00:23:44.451
Bueno Brothers, how are you doing?

00:23:44.476 --> 00:23:47.251
It's stressful, but I think
we're almost getting there.

00:23:47.276 --> 00:23:48.531
Is any of it working?

00:23:48.556 --> 00:23:51.251
Yeah, most of it. Almost.
Can you demonstrate the door?

00:23:51.276 --> 00:23:52.726
Yeah. It's a big move, isn't it?

00:23:52.750 --> 00:23:54.451
And that's a big,
bold statement.

00:23:59.426 --> 00:24:02.281
There it is. Has it proved
reliable generally, though?

00:24:02.306 --> 00:24:03.371
Yes.

00:24:04.785 --> 00:24:07.121
How easy is it
to drill through a cabbage?

00:24:07.146 --> 00:24:09.001
Not as exciting
as I thought it would be.

00:24:09.026 --> 00:24:12.281
The Young Physicists are still
happily working together, too.

00:24:12.306 --> 00:24:14.561
By which I mean separately.

00:24:14.586 --> 00:24:16.151
We're a lot more organised today.

00:24:16.176 --> 00:24:19.511
Feeling really, really proud
of what I've done today, actually.

00:24:19.536 --> 00:24:21.231
It works.

00:24:21.256 --> 00:24:24.620
Leon's finished ruining a table to
hold his water catchers

00:24:24.645 --> 00:24:27.791
while Ivana and Olivia tackle their
tricky chemical stage...

00:24:27.816 --> 00:24:30.181
Acetone, it burns.

00:24:30.206 --> 00:24:33.740
...nail polish remover
melting a polystyrene plate.

00:24:33.765 --> 00:24:35.431
Oop,ooP,0°P-

00:24:37.765 --> 00:24:40.311
So I think if we balance a ball...

00:24:40.336 --> 00:24:42.311
Really effective, that.

00:24:42.336 --> 00:24:44.231
Young Physicists. Hello.

00:24:44.256 --> 00:24:46.591
Hello. You've ruined
everything in the kitchen.

00:24:46.616 --> 00:24:48.231
Yeah, even the table is.

00:24:48.256 --> 00:24:50.591
We've kind of drilled into it.

00:24:50.616 --> 00:24:51.887
The antique table?

00:24:51.911 --> 00:24:53.181
Yeah. Yeah. Antique table.

00:24:53.206 --> 00:24:54.711
Is this your buoyancy bit?

00:24:54.736 --> 00:24:59.261
A ball falls out of there, gets
caught and goes along these rails.

00:24:59.286 --> 00:25:02.820
A potato gets knocked
into the water.

00:25:02.845 --> 00:25:06.151
Through Archimedes' principle...
Displaces water. Yeah.

00:25:06.176 --> 00:25:08.791
That will trickle down
into the first catcher,

00:25:08.816 --> 00:25:12.671
which isn't very good...
You know how to sell it, don't you?

00:25:12.696 --> 00:25:16.261
You really do. ..through the
second catcher and into the third.

00:25:16.286 --> 00:25:18.247
Good. OK. Fills
that... Yeah. Do ink,

00:25:18.271 --> 00:25:20.231
for something to
happen next door?

00:25:20.256 --> 00:25:22.620
Yes. I sincerely hope it works.

00:25:24.336 --> 00:25:26.791
Zach, I'm seeing something
with the Young Physicists.

00:25:26.816 --> 00:25:29.111
Oh, it's such a cool principle,
but there's a lot

00:25:29.136 --> 00:25:30.391
of unknown variables with it.

00:25:30.416 --> 00:25:32.700
Let's take that plate.
That plate has to melt.

00:25:32.725 --> 00:25:34.111
Are they going to pour enough?

00:25:34.136 --> 00:25:36.750
Is that plate going to gunk up the
tracks? Absolutely brilliant,

00:25:36.775 --> 00:25:39.261
but so many places that could
potentially go wrong.

00:25:41.176 --> 00:25:44.441
So I drop this.
It has not been tested yet.

00:25:44.466 --> 00:25:46.750
Teams, 15 minutes.

00:25:46.775 --> 00:25:49.441
That's, what, 900 seconds.
Use them wisely.

00:25:49.466 --> 00:25:52.341
All right, we need to start testing
this. Let's do a full run, guys.

00:25:52.366 --> 00:25:54.721
Just do it. Just do it.
Go, go, go, go.

00:25:54.746 --> 00:25:57.700
Last-minute testing
isn't going well.

00:25:57.725 --> 00:26:00.191
The falling pineapple
that triggers the Bueno Brothers'

00:26:00.216 --> 00:26:01.830
slingshot is unreliable.

00:26:01.855 --> 00:26:04.801
Why? It was all working
a second ago!

00:26:04.826 --> 00:26:07.511
So they're swapping it with
a precariously balanced tin

00:26:07.536 --> 00:26:09.801
that should fall more easily.

00:26:09.826 --> 00:26:11.441
But, yeah, the pressure is on.

00:26:11.466 --> 00:26:13.870
Go on, go on, go on. No!

00:26:13.895 --> 00:26:17.111
And the Young Physicists are
replacing their small dominoes with

00:26:17.136 --> 00:26:21.551
a board so their unruly basketball
has a bigger target to hit.

00:26:21.576 --> 00:26:24.031
Anything that can go wrong, will.

00:26:26.136 --> 00:26:29.981
Five, four, three...

00:26:30.006 --> 00:26:32.271
two, one.

00:26:32.296 --> 00:26:35.391
And that is it. Build time is over.

00:26:36.725 --> 00:26:39.341
Get set for test run.

00:26:39.366 --> 00:26:40.471
OK.

00:26:40.496 --> 00:26:43.991
Both teams have finished on time,
so I'm hoping they start to look

00:26:44.016 --> 00:26:47.031
like they deserve a place
in the semifinal.

00:26:47.056 --> 00:26:49.351
The Bueno Brothers will test first.

00:26:49.376 --> 00:26:51.271
Bueno Brothers,
how are you feeling?

00:26:51.296 --> 00:26:53.630
Pretty nervous,
I'm not going to lie. Good.

00:26:53.655 --> 00:26:56.880
Zach, I don't want to be negative,
but if something were to go wrong,

00:26:56.905 --> 00:26:59.521
what do you think it would be?
Definitely the slingshot.

00:26:59.546 --> 00:27:02.161
I've never seen a reliable
run yet today. Slingshot.

00:27:02.186 --> 00:27:04.031
OK, we'll be looking out for that.

00:27:04.056 --> 00:27:08.080
They start with a falling door,
triggering a basket of pool *.

00:27:08.105 --> 00:27:11.830
Then the buoyancy stage of a
floating jar triggering a mousetrap,

00:27:11.855 --> 00:27:13.750
and end with a falling tin,

00:27:13.775 --> 00:27:16.960
triggering the potentially
unreliable slingshot.

00:27:16.985 --> 00:27:19.601
Well, let's not prolong the agony.
Let's do this.

00:27:19.626 --> 00:27:21.960
If you're ready, let's set
this thing off. Good luck!

00:27:31.266 --> 00:27:33.191
What's happened? I don't know.

00:27:33.216 --> 00:27:36.111
Is this a bit very slow,
or has it stopped? It's stopped.

00:27:38.466 --> 00:27:41.991
Despite the door triggering
the spoon seesaw and the pool *

00:27:42.016 --> 00:27:45.041
tumbling from the basket,
the mousetrap couldn't shift

00:27:45.066 --> 00:27:47.681
their hefty butternut squash,
and the buoyancy stage

00:27:47.706 --> 00:27:49.351
was never triggered.

00:27:50.985 --> 00:27:53.321
We genuinely thought
we were in a good place.

00:27:53.346 --> 00:27:55.991
And then you kind of see it fall
apart, like in front of you.

00:27:56.016 --> 00:27:58.321
It's heartbreaking.

00:27:58.346 --> 00:28:02.991
After yesterday's disaster,
their rivals need to fare better.

00:28:03.016 --> 00:28:06.991
The Young Physicists start
with an unruly basketball,

00:28:07.016 --> 00:28:11.471
then the clever but risky acetone
stage with the all-important

00:28:11.496 --> 00:28:14.960
demonstration of buoyancy
at the end.

00:28:14.985 --> 00:28:17.601
Young Physicists,
it is test run time.

00:28:17.626 --> 00:28:20.191
How are you feeling.
Yeah, better than yesterday.

00:28:20.216 --> 00:28:23.041
More confident on this one, but...
Still nervous. Very nervous.

00:28:23.066 --> 00:28:26.681
Zach, if something were to go wrong,
where do you think it might be?

00:28:26.706 --> 00:28:29.911
The basketball. So unpredictable.
That's a potential weak spot.

00:28:29.936 --> 00:28:33.321
Yeah. Good luck.
Leon, take it away.

00:28:41.865 --> 00:28:44.840
Oh, as feared,
it was the basketball.

00:28:44.865 --> 00:28:48.321
Leon, maybe trigger the next bit?

00:28:48.346 --> 00:28:49.431
There.

00:28:55.785 --> 00:28:57.710
This is the chemical reaction bit.

00:28:57.735 --> 00:28:59.681
Come on... Yes!

00:28:59.706 --> 00:29:01.071
Yes. Oh!

00:29:03.865 --> 00:29:05.710
It's a melting plate! Oh, God.

00:29:05.735 --> 00:29:08.041
It's just a melting plate.

00:29:08.066 --> 00:29:10.681
Well, we've gone this far. Leon,
you might as well tip it through.

00:29:10.706 --> 00:29:11.991
Go on.

00:29:12.016 --> 00:29:14.681
It's still testing. OK, OK, OK.

00:29:15.785 --> 00:29:17.171
OK.

00:29:17.196 --> 00:29:20.351
Young Physicists, I think we'll
call it quits at this point.

00:29:20.376 --> 00:29:22.431
You've got issues to resolve.

00:29:22.456 --> 00:29:26.840
As Zach feared, the unruly
basketball missed the board,

00:29:26.865 --> 00:29:29.921
and the pool ball
got stuck on the molten plate.

00:29:29.946 --> 00:29:33.071
It's two disasters in as many days.

00:29:33.096 --> 00:29:34.760
Went less than well.

00:29:34.785 --> 00:29:37.681
The funny thing is is that we were
way more organised for this one

00:29:37.706 --> 00:29:39.071
than we were for the last one.

00:29:39.096 --> 00:29:41.681
I just spent a day of my life
doing something that doesn't work.

00:29:41.706 --> 00:29:44.281
These machines can be so cruel,
and there'll be even

00:29:44.306 --> 00:29:45.791
ITIOFE PFESSUFE tomorrow.

00:29:52.675 --> 00:29:54.701
My life is hard.

00:29:54.726 --> 00:29:58.530
Even watering the plants
is a chore too far.

00:29:58.555 --> 00:30:00.621
Oh, not again!

00:30:00.646 --> 00:30:04.141
So I was hoping these
teams of young science gurus

00:30:04.166 --> 00:30:08.171
could create contraptions
that do the job for me.

00:30:08.196 --> 00:30:11.341
You sure the water's working?
Make sure the water's working.

00:30:11.366 --> 00:30:14.701
It turns out I may have
overestimated their abilities.

00:30:14.726 --> 00:30:16.621
50—50 on the water working.

00:30:16.646 --> 00:30:18.650
It's still not doing it.

00:30:18.675 --> 00:30:22.701
Teams, I'd love to sugar-coat
the events of yesterday for you,

00:30:22.726 --> 00:30:24.011
but I can't.

00:30:24.036 --> 00:30:26.701
It was an unmitigated disaster.

00:30:26.726 --> 00:30:29.701
What I sense you need
is a further challenge.

00:30:29.726 --> 00:30:33.621
So whilst one of you remains to tidy
the kitchen, I'd like the other two

00:30:33.646 --> 00:30:37.121
team members to visit your workshop,
where you'll find waiting

00:30:37.146 --> 00:30:40.791
for you a mystery object
that you must incorporate

00:30:40.816 --> 00:30:43.121
into today's build.

00:30:43.146 --> 00:30:44.840
Understood?

00:30:44.865 --> 00:30:47.121
OK. Get on with it. Good luck.

00:30:47.146 --> 00:30:48.960
Godspeed.

00:30:48.985 --> 00:30:52.351
You're going to need all the help
you can get.

00:30:52.376 --> 00:30:56.710
We do need to start moving, cos we
are going quite slow this morning.

00:30:56.735 --> 00:30:58.201
This is going to go.

00:30:58.226 --> 00:31:01.231
The teams' to do lists
are overwhelming.

00:31:01.256 --> 00:31:04.071
Fix yesterday's issues.

00:31:04.096 --> 00:31:06.431
I'm happy with that. That's going
to work now.

00:31:06.456 --> 00:31:09.921
Create a new machine that spans my
garden and waters my plants.

00:31:09.946 --> 00:31:12.197
We want to keep it small today.

00:31:12.221 --> 00:31:13.281
Yeah. So it's reliable.

00:31:13.306 --> 00:31:16.481
Ensure the whole thing works as
one contraption.

00:31:16.506 --> 00:31:17.791
OK. We're set.

00:31:17.816 --> 00:31:20.281
I think today, it has to be a plan
to just test, test, test.

00:31:20.306 --> 00:31:21.710
The more we test the better.

00:31:21.735 --> 00:31:24.921
And impress Zach with a creative
use of the mystery object.

00:31:24.946 --> 00:31:28.231
OK. They weren't there before.
Take a guess it's them.

00:31:28.256 --> 00:31:30.121
What are they?
A pair of garden shears.

00:31:30.146 --> 00:31:31.871
Oh! That's pretty cool.

00:31:31.896 --> 00:31:35.681
While the teams get to grips with
the mystery object, and hopefully

00:31:35.706 --> 00:31:40.760
avoid accidents, here's Shini Somara
with the science of garden shears.

00:31:40.785 --> 00:31:42.321
And there is some.

00:31:44.665 --> 00:31:46.681
When I see a pair of garden shears,

00:31:46.706 --> 00:31:49.231
I see two major engineering
principles.

00:31:49.256 --> 00:31:53.611
The first one being that the handles
act like levers, and levers

00:31:53.636 --> 00:31:54.970
are force multipliers.

00:31:54.995 --> 00:31:58.840
So, the amount of force I put in
at the handles gets multiplied

00:31:58.865 --> 00:32:01.151
many times at the blade edge.

00:32:01.176 --> 00:32:04.231
Then the second engineering
principle is the blade edge itself,

00:32:04.256 --> 00:32:09.441
because the sharper the blades,
the smaller their surface area.

00:32:09.466 --> 00:32:11.801
And that's a really good thing,
because all the force

00:32:11.826 --> 00:32:16.510
that I'm applying gets spread
over this small surface area,

00:32:16.535 --> 00:32:19.871
making the blade really effective.

00:32:19.896 --> 00:32:23.970
So, the teams could use these garden
shears to cut something.

00:32:23.995 --> 00:32:28.921
Or they could use the handles and
trigger the next reaction that way.

00:32:30.976 --> 00:32:33.331
I mean, it's definitely
going to be able to cut that.

00:32:33.356 --> 00:32:36.441
How many Young Physicists does
it take to cut some rope?

00:32:36.466 --> 00:32:38.720
OK. I guess I stand corrected.

00:32:38.745 --> 00:32:40.590
Oh. More than three, apparently.

00:32:40.615 --> 00:32:43.161
But you do have the pivot
point there. Yeah.

00:32:43.186 --> 00:32:46.131
So, the Young Physicists are
thinking of using the shears

00:32:46.156 --> 00:32:47.520
as a hinge.

00:32:47.545 --> 00:32:49.201
A little lower, a little lower.

00:32:49.226 --> 00:32:51.561
While, after some mutual grooming...

00:32:51.586 --> 00:32:53.201
Oh, my God. Do me as well.

00:32:53.226 --> 00:32:56.520
...the Bueno Brothers are returning
to violence and destruction.

00:32:56.545 --> 00:32:58.331
It's actually nice.

00:32:58.356 --> 00:33:02.331
We realised unanimously that we want
to pop a water balloon.

00:33:02.356 --> 00:33:04.691
Like, let's just go...
You're going to struggle

00:33:04.716 --> 00:33:07.001
unless you stick something pointy
to the end of that.

00:33:07.026 --> 00:33:09.331
Ideas formed and clock ticking,

00:33:09.356 --> 00:33:11.691
the rivals really need
to start building.

00:33:11.716 --> 00:33:14.441
I don't want to drill into Gnomy.
We have to drill into Gnomy.

00:33:14.466 --> 00:33:17.961
The Young Physicists
are modifying a gnome...

00:33:17.986 --> 00:33:21.520
Thank you for covering his eyes.
..so he can fly down a zip wire.

00:33:26.665 --> 00:33:29.441
just so you know, you are losing
the fight with the wheelbarrow.

00:33:29.466 --> 00:33:31.801
How are you feeling about today?
I'm feeling good.

00:33:31.826 --> 00:33:34.441
So, I think we're going for a simple
approach today. Good idea.

00:33:34.466 --> 00:33:37.520
Trying to get the simple out of the
way and testing all the way through,

00:33:37.545 --> 00:33:40.131
like, do something, test it, do
something, test it, to make sure

00:33:40.156 --> 00:33:42.770
that it's actually working. Yes.
Any hints about what you might be

00:33:42.795 --> 00:33:45.499
planning in here? Balloons.

00:33:45.523 --> 00:33:46.571
Balloons? Balloons. Balloons.

00:33:46.596 --> 00:33:49.001
Right. And flying gnomes.

00:33:49.026 --> 00:33:51.411
You didn't get much sleep
last night, did you, guys? No.

00:33:51.436 --> 00:33:54.770
That's clearly slightly hysterical.
OK. Yeah.

00:33:54.795 --> 00:33:58.650
Their delirium-fuel led machine
starts with a bucket on a seesaw

00:33:58.675 --> 00:34:01.704
pulling a fishing wire that releases
a bowling ball.

00:34:01.729 --> 00:34:04.679
This rolls down a ramp and hits
a croquet mallet

00:34:04.704 --> 00:34:07.349
that pulls a string collapsing
a deck chair,

00:34:07.374 --> 00:34:10.279
causing the garden shears
to release their gnome,

00:34:10.304 --> 00:34:13.349
which slides down a zip wire
and pops a water balloon

00:34:13.374 --> 00:34:15.949
suspended over my thirsty plants.

00:34:15.974 --> 00:34:17.708
What are you doing, Leon?

00:34:17.733 --> 00:34:22.229
I am setting up the machine
so that if it fails, it works.

00:34:23.894 --> 00:34:27.958
Poor Leon's tackling the tricky
water bucket seesaw.

00:34:27.983 --> 00:34:30.508
As the bucket on the left
fills with water,

00:34:30.533 --> 00:34:32.479
the one on the right will rise.

00:34:32.504 --> 00:34:36.119
This will pull the fishing wire,
which Leon is deliberately attaching

00:34:36.144 --> 00:34:38.429
gently, so it slips free.

00:34:38.454 --> 00:34:42.789
So, why not use that slippage
to help it work?

00:34:42.814 --> 00:34:45.429
Here's a little bit of tape,

00:34:45.454 --> 00:34:47.789
put a decent amount of tension
behind it,

00:34:47.814 --> 00:34:50.149
and when that just adds
a little bit more,

00:34:50.174 --> 00:34:52.999
it should slide out,
the gate will release

00:34:53.024 --> 00:34:54.399
and so will the bowling ball.

00:34:54.424 --> 00:34:57.149
Sadly, it's even harder
than it sounds.

00:34:58.743 --> 00:35:00.399
We don't need a lot of force here.

00:35:00.424 --> 00:35:02.119
It doesn't have to be
anything heavy. OK.

00:35:02.144 --> 00:35:04.869
So, I'll use a football, then.
That would've been so much easier.

00:35:04.894 --> 00:35:06.869
Misery guts has come back,
hasn't he?

00:35:06.894 --> 00:35:10.799
I'm sorry. I've just been stuck
on this for ages.

00:35:10.824 --> 00:35:13.508
And it's so annoying
trying to think of things,

00:35:13.533 --> 00:35:17.919
because I'm not that creative,
even if some people think I am.

00:35:17.944 --> 00:35:20.229
Well, you're more creative
than me, that's for sure.

00:35:20.254 --> 00:35:21.869
Someone give him a hug.

00:35:22.804 --> 00:35:25.169
there is a little bit
of engineering hysteria

00:35:25.194 --> 00:35:27.779
after everything that could go
wrong did for both teams.

00:35:27.804 --> 00:35:30.859
And that's what happens when young
people get in the garden,

00:35:30.884 --> 00:35:32.699
they go berserk.

00:35:32.724 --> 00:35:35.659
Hello, Brothers Bueno. Hi.
How are we?

00:35:35.684 --> 00:35:38.018
Straight to grips with the mystery
object. Yes. Yeah.

00:35:38.043 --> 00:35:40.379
What are you doing with it?
Stabbing it into a water balloon.

00:35:40.404 --> 00:35:42.379
You didn't want to move
it or articulate it?

00:35:42.404 --> 00:35:45.779
No. We were kind of worried anyway,
because it's kind of rusty.

00:35:45.804 --> 00:35:47.809
You're criticising my garden tools.
Yes.

00:35:47.834 --> 00:35:49.859
We want to get this all done
as soon as possible.

00:35:49.884 --> 00:35:51.739
Yeah, we need to get the whole
thing to work,

00:35:51.764 --> 00:35:54.859
so the simpler this is, the better.
Right. Well, carry on.

00:35:54.884 --> 00:35:56.739
Thank you very much.
Thank you. Thank you.

00:35:56.764 --> 00:35:59.659
This supposedly simple machine
starts when the slingshot

00:35:59.684 --> 00:36:02.379
that left the kitchen knocks over
a dustbin,

00:36:02.404 --> 00:36:05.419
setting a chain falling
from some flower baskets.

00:36:05.444 --> 00:36:09.169
The chain releases a watering can
that's propping up a lawnmower,

00:36:09.194 --> 00:36:11.499
causing the mower to fall flat.

00:36:11.524 --> 00:36:14.629
Finally, a string from the mower
topples the deck chair holding

00:36:14.654 --> 00:36:18.018
the garden shears, causing them
to burst a water balloon hidden

00:36:18.043 --> 00:36:19.709
in my plants.

00:36:19.734 --> 00:36:21.529
Honestly, these brothers.

00:36:24.043 --> 00:36:28.018
It sounds so destructive over there.
That's cos it is. That's why.

00:36:28.043 --> 00:36:30.939
Remember, we don't have very long
today. Yeah, I know.

00:36:30.964 --> 00:36:33.549
Today, reliability is king.

00:36:33.574 --> 00:36:35.819
That's not very nice, is it? Teams,

00:36:35.844 --> 00:36:38.379
you have four hours left.

00:36:38.404 --> 00:36:40.739
Four hours to change the world.

00:36:42.654 --> 00:36:46.148
The Bueno Brothers are trying to
ensure their chain fountain works

00:36:46.173 --> 00:36:48.789
smoothly... It makes a horrible
noise. It definitely does.

00:36:48.814 --> 00:36:51.268
...by adding cloths to reduce
the risk of it snagging

00:36:51.293 --> 00:36:52.739
on the flower basket.

00:36:52.764 --> 00:36:54.218
That is pretty perfect.

00:36:54.243 --> 00:36:57.429
While, in a sentence you'd never
hear anywhere else,

00:36:57.454 --> 00:37:00.909
the Young Physicists are lubricating
their gnome's zip wire.

00:37:02.324 --> 00:37:04.148
I think it slides better.

00:37:04.173 --> 00:37:08.179
Zach's expert eyes are across
all of it.

00:37:08.204 --> 00:37:10.709
Zach, what differences are
you seeing in their approach

00:37:10.734 --> 00:37:14.299
to this final stage?
Today, they're going for simple,

00:37:14.324 --> 00:37:16.379
less stuff, but test, test, test.

00:37:16.404 --> 00:37:18.989
Because, well, it's got to work.
Every time they fail

00:37:19.014 --> 00:37:22.069
they ARE making changes.
Are we going to see either team

00:37:22.094 --> 00:37:24.539
get all the way through?
I want to see it happen.

00:37:24.564 --> 00:37:27.379
I think it can happen.
Time will tell,

00:37:27.404 --> 00:37:30.179
because right now the clock
is moving on them.

00:37:32.894 --> 00:37:35.989
Both teams are tackling
the end of their machines.

00:37:36.014 --> 00:37:38.869
Did you ever go to Scouts or
something? No, no, I did not.

00:37:38.894 --> 00:37:40.429
I can tell by the knots.

00:37:40.454 --> 00:37:43.459
Team Brotherly Love are working
together on their lethal

00:37:43.484 --> 00:37:45.018
falling lawnmower.

00:37:45.043 --> 00:37:47.379
That holds pretty well.
Actually, a little higher.

00:37:47.404 --> 00:37:49.989
When the watering can propping
it up is removed...

00:37:50.014 --> 00:37:52.509
Tug on it, tug on it.
..It should fall and collapse

00:37:52.534 --> 00:37:55.268
the deck chair holding the shears.

00:37:55.293 --> 00:37:57.509
Teams, there are two hours to go.

00:37:58.923 --> 00:38:00.348
Cut it a bit fine, haven't we?

00:38:00.373 --> 00:38:02.819
You can panic if you like — or work.

00:38:02.844 --> 00:38:06.429
The Young Physicists are making the
spike to pop their water balloon.

00:38:06.454 --> 00:38:09.949
I have no clue. They just were doing
it, and here I am doing it.

00:38:09.974 --> 00:38:11.898
But nobody told poor Leon.

00:38:11.923 --> 00:38:13.739
So, we don't want that piece
of wood on it.

00:38:13.764 --> 00:38:16.098
I was using the piece of wood
to hammer it into,

00:38:16.123 --> 00:38:17.898
because I didn't want to hammer it
into the floor.

00:38:17.923 --> 00:38:19.348
Well, there we are then. Easy.

00:38:22.894 --> 00:38:24.639
I mean, I'm soggy, but.

00:38:24.664 --> 00:38:26.509
Ah. I think that was Leon's revenge.

00:38:26.534 --> 00:38:28.749
Why do you think I stepped away?

00:38:29.894 --> 00:38:32.509
There's an hour left until
each machine needs to run

00:38:32.534 --> 00:38:34.389
across all three rooms.

00:38:34.414 --> 00:38:37.589
Leon, let's get the water
sorted, because that's

00:38:37.614 --> 00:38:39.108
not working right now.

00:38:40.334 --> 00:38:42.589
Did the duck not go?
The duck didn't go.

00:38:43.484 --> 00:38:45.789
Yeah, fine. That didn't work.

00:38:45.814 --> 00:38:48.469
The Young Physicists' football
is too light...

00:38:48.494 --> 00:38:49.999
Would the bowling ball work?

00:38:50.024 --> 00:38:52.589
...so Leon's rolling out
his old nemesis.

00:38:52.614 --> 00:38:55.539
After that, we're done.
Five minutes until showtime.

00:38:55.564 --> 00:38:57.509
Come on, finish building.

00:38:57.534 --> 00:38:59.539
All right, let's run it again.

00:38:59.564 --> 00:39:02.719
Our rope broke, so we're switching
it for fishing line

00:39:02.744 --> 00:39:05.309
because the other rope
is a bit, er, temperamental.

00:39:05.334 --> 00:39:08.749
Leon, how confident are we that
the water works? Not massively.

00:39:08.774 --> 00:39:12.389
Ten, nine, eight,

00:39:12.414 --> 00:39:15.589
seven, six, five,

00:39:15.614 --> 00:39:18.028
four, three,

00:39:18.053 --> 00:39:20.309
two, one.

00:39:20.334 --> 00:39:22.999
That's it. Teams, time is up.

00:39:23.024 --> 00:39:26.949
Stop building and prepare your
machines for the final test.

00:39:26.974 --> 00:39:28.439
Good luck to both teams.

00:39:28.464 --> 00:39:30.148
All right, let's go. Oh, man.

00:39:30.173 --> 00:39:32.908
Their dignity and a place
in the semifinal

00:39:32.933 --> 00:39:35.799
are at stake. Prepare for war.

00:39:35.824 --> 00:39:38.719
So I really hope this all works.

00:39:44.814 --> 00:39:47.978
Welcome back to judgment Day
for our two teams.

00:39:48.003 --> 00:39:50.459
After three days' hard work

00:39:50.484 --> 00:39:53.739
and some agonising, catastrophic
failures,

00:39:53.764 --> 00:39:56.098
it all comes down to this.

00:39:56.123 --> 00:39:58.619
Will either machine water my plants

00:39:58.644 --> 00:40:03.028
and who will Zach choose to earn
a place in our semifinal?

00:40:03.053 --> 00:40:06.259
Once started, the teams' machines
will ideally complete their task

00:40:06.284 --> 00:40:08.028
without ever being touched again.

00:40:08.053 --> 00:40:11.028
Of course, that doesn't
always happen.

00:40:11.053 --> 00:40:14.819
So, if a machine stops mid-run, one
of the team members can step in

00:40:14.844 --> 00:40:17.098
and move it to the next transition.

00:40:17.123 --> 00:40:19.429
That's known as an intervention.

00:40:19.454 --> 00:40:22.898
Zach's rules allow a maximum
of three interventions,

00:40:22.923 --> 00:40:26.108
and he'll pick a winner based
on how many they need,

00:40:26.133 --> 00:40:29.819
as well as the creativity,
complexity and wow factor

00:40:29.844 --> 00:40:31.699
of each machine.

00:40:31.724 --> 00:40:34.699
First to face judgment
are the Bueno Brothers.

00:40:34.724 --> 00:40:37.789
Their garden machine starts with
a slingshot knocking over

00:40:37.814 --> 00:40:41.259
a dustbin, which sets
off a chain fountain.

00:40:41.284 --> 00:40:45.059
Next, a watering can is yanked from
under a lawnmower, which falls

00:40:45.084 --> 00:40:46.389
to the floor.

00:40:46.414 --> 00:40:49.509
This collapses the sun lounger,
sending the mystery object

00:40:49.534 --> 00:40:51.829
of garden shears into
a water balloon,

00:40:51.854 --> 00:40:54.339
which should pop and soak my plants.

00:40:54.364 --> 00:40:57.699
But they'll only get this far if
they've fixed all the problems

00:40:57.724 --> 00:41:00.028
in their first two rooms.

00:41:00.053 --> 00:41:02.389
This is going to be
a new experience for me,

00:41:02.414 --> 00:41:04.439
this is going to be a new experience
for all of us.

00:41:04.464 --> 00:41:07.108
Please work.
I wish you every success.

00:41:10.253 --> 00:41:13.189
On your command, set it off.

00:41:13.214 --> 00:41:15.619
Whenever you're ready, brother.
Go for it.

00:41:17.084 --> 00:41:19.589
Man, I'm nervous, but we got this.

00:41:21.253 --> 00:41:23.509
The skateboard is rolling.

00:41:23.534 --> 00:41:24.799
The table's collapsed.

00:41:24.824 --> 00:41:26.259
Boot is down.

00:41:26.284 --> 00:41:28.269
Will the door fall?

00:41:28.294 --> 00:41:29.699
Here we go. Yes, it will.

00:41:29.724 --> 00:41:32.228
Butternut squash
and veg basket dropped.

00:41:32.253 --> 00:41:35.269
We just need the teacup to trigger
the mousetrap and release...

00:41:35.294 --> 00:41:37.549
There it goes. Slingshot.

00:41:37.574 --> 00:41:39.908
Falling bin. Chain fountain.

00:41:41.053 --> 00:41:42.749
Oh, please tip the lawnmower.

00:41:42.774 --> 00:41:44.309
Come on, please!

00:41:44.334 --> 00:41:45.519
Oh, my God.

00:41:47.133 --> 00:41:49.189
Please...

00:41:49.214 --> 00:41:51.589
Oh-ho-ho-ho! Yes!

00:41:51.614 --> 00:41:53.309
Oh, my word!

00:41:56.574 --> 00:41:57.908
Speechless.

00:41:57.933 --> 00:42:00.799
I need to sit down, I think.
Well done. Oh, thank you.

00:42:00.824 --> 00:42:02.829
Congratulations, guys. Fantastic.

00:42:02.854 --> 00:42:04.599
I need a hug!

00:42:04.624 --> 00:42:07.599
A full run with no interventions

00:42:07.624 --> 00:42:10.908
and successful use of buoyancy
and the garden shears.

00:42:10.933 --> 00:42:13.419
It's a chain reaction miracle.

00:42:13.444 --> 00:42:15.988
From the instant it finished,
like, right, I don't care

00:42:16.013 --> 00:42:20.309
if I win or lose now. I built a
thing and it worked! I'm good.

00:42:22.183 --> 00:42:25.669
So, enormous pressure on their
rivals' garden machine,

00:42:25.694 --> 00:42:28.238
which starts when a seesaw
releases a latch,

00:42:28.263 --> 00:42:30.959
sending a bowling ball down a ramp.

00:42:30.984 --> 00:42:33.319
The ball hits a croquet mallet,

00:42:33.344 --> 00:42:36.189
pulling a string that opens
the garden shears.

00:42:36.214 --> 00:42:40.599
This releases a gnome down a zip
wire, knocking a spiked hinge

00:42:40.624 --> 00:42:43.908
into a water balloon, hopefully
soaking the plants below.

00:42:43.933 --> 00:42:46.879
But for that to happen,
their temperamental living room

00:42:46.904 --> 00:42:49.749
and kitchen machines
need to work first.

00:42:49.774 --> 00:42:53.749
Young Physicists, all of that
didn't build itself. Correct.

00:42:53.774 --> 00:42:55.629
It's quite a lot of effort. Yeah.

00:42:55.654 --> 00:42:58.069
And now we're about to see
if it works.

00:42:58.094 --> 00:42:59.959
I wish we weren't, but, yes. Yeah.

00:42:59.984 --> 00:43:02.269
Zach, is it going to work?

00:43:02.294 --> 00:43:05.709
That final room, I don't know.
They got it down right to the wire.

00:43:05.734 --> 00:43:11.399
Well, I just hope it does, nearly as
much as you do. In your own time,

00:43:11.424 --> 00:43:12.959
start your machine.

00:43:12.984 --> 00:43:15.549
Olivia, you know what to do. OK.

00:43:15.574 --> 00:43:18.429
And here we go. Fire.

00:43:18.454 --> 00:43:20.759
The ball is out of the TV cabinet.

00:43:20.784 --> 00:43:22.709
It's knocked the wedge
from under the table.

00:43:22.734 --> 00:43:26.429
And the record player is winding the
string and lifting the weight.

00:43:26.454 --> 00:43:28.038
So far, so good.

00:43:30.344 --> 00:43:33.319
Bingo! The red ball has fallen.

00:43:33.344 --> 00:43:36.759
I don't remember it being this slow.
And will hopefully knock the bucket

00:43:36.784 --> 00:43:38.349
from the mousetrap.

00:43:38.374 --> 00:43:40.349
OK, the bottle is released.

00:43:40.374 --> 00:43:42.839
The new football is falling.

00:43:42.864 --> 00:43:44.679
And the cabbage latch has worked.

00:43:44.704 --> 00:43:47.319
And now the ball needs to collapse
the ironing board.

00:43:47.344 --> 00:43:49.599
Ah... What's happened?

00:43:49.624 --> 00:43:50.629
It didn't fall.

00:43:50.654 --> 00:43:52.959
You're allowed an intervention.
Olivia,

00:43:52.984 --> 00:43:54.519
move it past that transition.

00:43:54.544 --> 00:43:56.399
This is the first of three
interventions

00:43:56.424 --> 00:43:58.709
they're allowed under Zach's rules.

00:43:58.734 --> 00:44:01.679
We just need to wait for the acetone
to melt the plate.

00:44:01.704 --> 00:44:04.349
This time, hopefully, the ball
won't get stuck.

00:44:04.374 --> 00:44:06.399
Brilliant. Good delay.

00:44:06.424 --> 00:44:07.709
It's through.

00:44:07.734 --> 00:44:11.629
Now, the spilt water needs to tip
Leon's tricky seesaw

00:44:11.654 --> 00:44:13.959
to trigger the garden machine.

00:44:13.984 --> 00:44:16.429
Oh... I don't think this one'll
have worked either.

00:44:16.454 --> 00:44:17.988
You're allowed to intervene.

00:44:18.013 --> 00:44:20.038
OK. Intervention number two.

00:44:20.063 --> 00:44:22.038
Not ideal, but not a catastrophe.

00:44:23.143 --> 00:44:25.879
Yeah, that's not... Have we stalled?

00:44:25.904 --> 00:44:29.279
Yeah, third time.
But this is bad news.

00:44:29.304 --> 00:44:32.279
Leon's bowling ball nemesis
has rolled over rather than

00:44:32.304 --> 00:44:33.709
pushed the mallet,

00:44:33.734 --> 00:44:36.509
so it hasn't triggered
the gnome's release.

00:44:36.534 --> 00:44:39.319
You're allowed a third intervention.
Olivia,

00:44:39.344 --> 00:44:40.679
do it.

00:44:45.063 --> 00:44:46.788
Ha-ha! Well done!

00:44:46.813 --> 00:44:49.529
With three interventions,
that is still a completion.

00:44:49.554 --> 00:44:51.118
That is a completion.

00:44:51.143 --> 00:44:53.559
The Young Physicists
did water my plants

00:44:53.584 --> 00:44:56.559
in a pointlessly complicated way.

00:44:56.584 --> 00:44:58.918
It really worked better than
I thought it was going to do,

00:44:58.943 --> 00:45:01.279
to be honest. We were right up to
the wire in the last room.

00:45:01.304 --> 00:45:03.889
But with three interventions
against their rivals' none,

00:45:03.914 --> 00:45:07.199
and problems with their buoyancy
stage, I fear Zach's job

00:45:07.224 --> 00:45:09.788
may be an easy one today.

00:45:09.813 --> 00:45:11.399
What a competition.

00:45:11.424 --> 00:45:14.118
Three amazing days with two
incredible teams, who built

00:45:14.143 --> 00:45:16.429
two astonishing machines.

00:45:16.454 --> 00:45:19.559
Amazing. You guys used everyday
objects creatively.

00:45:19.584 --> 00:45:21.479
And most importantly,
you had fun with it.

00:45:21.504 --> 00:45:24.329
Yeah, and we had fun as well.
So, thank you for taking part.

00:45:24.354 --> 00:45:27.359
Obviously, it is a competition.
There has to be a winner.

00:45:28.914 --> 00:45:30.399
And that winner is...

00:45:33.504 --> 00:45:35.759
...the Bueno Brothers. Well done.

00:45:35.784 --> 00:45:38.509
Congratulations, you guys. Amazing.

00:45:40.224 --> 00:45:43.719
Winning meant nothing compared
to just seeing it all go.

00:45:43.744 --> 00:45:46.639
The name "Bueno," it literally means
"good." They're the best.

00:45:46.664 --> 00:45:49.248
They had the teamwork. Honestly,
those three brothers are just...

00:45:49.273 --> 00:45:51.118
Sibling telepathy or something
going on there.

00:45:51.143 --> 00:45:54.048
We've built things before, nowhere
near anything like this.

00:45:54.073 --> 00:45:57.048
So, I think the second time will be
a lot easier. But it'll also

00:45:57.073 --> 00:46:00.276
be a lot easier for
the enemy team.

00:46:00.300 --> 00:46:01.359
Rival, not enemy.
Rival. Oh, sorry.

00:46:02.464 --> 00:46:04.998
Oh-ho-ho-ho! Yes!

00:46:06.434 --> 00:46:09.479
Next time —
the first semifinal.

00:46:09.504 --> 00:46:12.248
It's completely broken.
And a battle of brothers.

00:46:12.273 --> 00:46:14.639
I can confirm the axe is sharp.