WEBVTT 00:00:00.300 --> 00:00:05.200 They say an Englishman's home is his castle, and this is mine. 00:00:05.240 --> 00:00:08.680 Some say it's a bit on the big side for one person, 00:00:08.720 --> 00:00:11.600 but, well, it's somewhere to lay my head. 00:00:11.640 --> 00:00:14.880 Yes, I'm just a regular guy living in a standard gaff, 00:00:14.920 --> 00:00:16.880 leading an ordinary existence 00:00:16.920 --> 00:00:20.360 and struggling to answer all of life's big questions. 00:00:20.400 --> 00:00:24.000 Like, "How can I water the plants while watching the box?" 00:00:24.040 --> 00:00:26.640 "Is it possible for me to boil the kettle 00:00:26.680 --> 00:00:29.480 "while I perform my morning ablutions?" 00:00:29.520 --> 00:00:33.520 and, "Why can't I cook my sausages while writing my memoirs?" 00:00:33.560 --> 00:00:37.360 I'm sure there are neat but dreary digital solutions available, 00:00:37.400 --> 00:00:39.520 but who wants to do this... 00:00:40.560 --> 00:00:41.880 ..when you can do this? 00:00:48.000 --> 00:00:50.080 It's just better. 00:00:50.120 --> 00:00:52.520 So, I'm holding a knockout tournament... 00:00:52.560 --> 00:00:54.480 This already feels dangerous. 00:00:54.520 --> 00:00:56.440 ..where teams of amateur engineers... 00:00:56.480 --> 00:01:00.880 Oh! ..will compete to perform my ordinary chores 00:01:00.920 --> 00:01:02.680 in extraordinary ways... 00:01:02.720 --> 00:01:06.240 Love it when a plan comes together. ..with chain-reaction machines... 00:01:07.920 --> 00:01:11.720 ..crazy contraptions made famous by viral videos 00:01:11.760 --> 00:01:15.880 that involve linking up everyday objects to magical effect. 00:01:19.360 --> 00:01:23.480 Chain-reaction guru Zach Umperovitch is the fearsome judge. 00:01:23.520 --> 00:01:25.760 That room had better work perfectly the first time. 00:01:25.800 --> 00:01:28.920 Oh, you stupid thing! Ooh! 00:01:28.960 --> 00:01:33.320 Dr Shini Somara will reveal the science inside the machines. 00:01:34.800 --> 00:01:36.280 And at the end of it all, 00:01:36.320 --> 00:01:39.600 one team will be crowned chain-reaction champions. 00:01:49.200 --> 00:01:50.560 It's the British summer. 00:01:50.600 --> 00:01:53.280 You're outside, soaking up some much-needed rays, 00:01:53.320 --> 00:01:57.880 and then disaster strikes - you've forgotten to feed the dog. 00:01:59.200 --> 00:02:02.680 I've set two engineering-mad teams a challenging task - 00:02:02.720 --> 00:02:06.400 build me a chain-reaction machine that will allow me to feed my dog 00:02:06.440 --> 00:02:10.000 without leaving my sun lounger here in my garden. 00:02:10.040 --> 00:02:14.200 My dog's life is in the hands of a trio of trainee pilots 00:02:14.240 --> 00:02:17.200 and three transatlantic martial arts fans 00:02:17.240 --> 00:02:20.280 arriving at one of my many outbuildings. 00:02:20.320 --> 00:02:23.960 I may be eccentric, but I'm not completely mad. 00:02:24.000 --> 00:02:26.040 I'm not letting the teams in there. 00:02:31.480 --> 00:02:33.800 What's that? Oh, elastic bands. 00:02:33.840 --> 00:02:35.960 Instead, I've given each team a workshop 00:02:36.000 --> 00:02:38.800 packed with everyday objects they can use in their builds... 00:02:38.840 --> 00:02:40.480 I think we've got enough stuff here. 00:02:40.520 --> 00:02:42.680 ..along with identical rooms just like mine 00:02:42.720 --> 00:02:44.760 to make their machines in. 00:02:44.800 --> 00:02:47.720 They've got three days to create their contraptions. 00:02:47.760 --> 00:02:50.960 On day one, their machines need to start in my garden 00:02:51.000 --> 00:02:53.400 and travel to the door into my study. 00:02:53.440 --> 00:02:57.000 Then, on day two, they need to cross my study and reach the kitchen. 00:02:57.040 --> 00:03:00.840 And on day three, they need to go through my kitchen and feed the dog. 00:03:00.880 --> 00:03:02.908 There's a lot we can do here. 00:03:02.932 --> 00:03:04.960 I want to use everything we've got! 00:03:05.000 --> 00:03:08.960 This ambitious approach should impress our expert judge. 00:03:09.000 --> 00:03:10.280 Zach Umperovitch 00:03:10.320 --> 00:03:12.640 is a two-time chain-reaction record holder 00:03:12.680 --> 00:03:15.960 and creator of some of the world's most ambitious machines. 00:03:16.000 --> 00:03:17.960 I just love chain-reaction machines, 00:03:18.000 --> 00:03:20.000 the absurd, cartoonish nature of them. 00:03:20.040 --> 00:03:22.000 They're started by human touch, 00:03:22.040 --> 00:03:25.360 but then each individual object triggers one after the other, 00:03:25.400 --> 00:03:27.320 until the task is solved. 00:03:27.360 --> 00:03:30.560 Some of my machines take weeks, even months, to build, 00:03:30.600 --> 00:03:33.840 but we've asked our teams to build them in just three days. 00:03:33.880 --> 00:03:36.040 Oh, there's always time for a cup of tea. 00:03:36.080 --> 00:03:39.120 Checking their fluids are the Aviators. 00:03:40.960 --> 00:03:45.480 Albert, Paul and Steve share more than a love of flying. 00:03:45.520 --> 00:03:48.800 We've all got a disability. We all fly aircraft. 00:03:48.840 --> 00:03:51.160 I made my own robotic cutting machine, 00:03:51.200 --> 00:03:53.320 and then I designed and made a prosthetic arm 00:03:53.360 --> 00:03:55.560 so that I could take flight training. 00:03:55.600 --> 00:03:57.360 Flying's just a wonderful thing, as well. 00:03:57.400 --> 00:04:00.920 When you're up there, it's amazing. It's a fantastic experience. 00:04:00.960 --> 00:04:04.200 It's also a great leveller, as well. When I'm flying an aircraft, 00:04:04.240 --> 00:04:06.120 I'm no different to an able-bodied person. 00:04:06.160 --> 00:04:08.280 Just don't pull the prop up. We need the spinny thing. 00:04:08.320 --> 00:04:10.640 Yeah, that'll do it, mate. Every day, 00:04:10.680 --> 00:04:13.240 we're always presented with things that we need to overcome. 00:04:13.280 --> 00:04:15.480 Tying shoelaces or doing something really menial 00:04:15.520 --> 00:04:17.280 that other people just take for granted, 00:04:17.320 --> 00:04:19.680 but we've had a lot of practice. Hopefully, the other teams 00:04:19.720 --> 00:04:22.760 haven't had the same sort of practice that we've had. Clear prop! 00:04:22.800 --> 00:04:25.960 I was a bit worried you might run out of tea. Yeah. Yeah. 00:04:27.080 --> 00:04:30.000 I'm thinking about things that you're well suited to 00:04:30.040 --> 00:04:31.440 and things that I can't reach. 00:04:31.480 --> 00:04:35.440 So, you know you were on about your guttering thing with your arch? 00:04:35.480 --> 00:04:38.480 Is it worth you guys working on that first? 00:04:38.520 --> 00:04:41.040 I've had an idea for your triggering mechanism. 00:04:41.080 --> 00:04:43.440 I can start fiddling with that in the meantime. 00:04:43.480 --> 00:04:45.880 Aviators, off the ground. 00:04:45.920 --> 00:04:48.000 Oh, I do love this tool box. 00:04:48.040 --> 00:04:51.520 Their rivals are being outsmarted by a children's football net... 00:04:51.560 --> 00:04:54.680 I'm pretty confident that the instructions exist. 00:04:54.720 --> 00:04:57.120 ..which bodes well. 00:04:57.160 --> 00:04:59.760 The Wild Cards are martial art and stunt fans 00:04:59.800 --> 00:05:03.200 Shola and Nick from the States and their Brit mate, Greg. 00:05:03.240 --> 00:05:05.360 Get it right up there. Show me what you got. 00:05:05.400 --> 00:05:08.720 We don't traditionally come from any type of engineering background. 00:05:08.760 --> 00:05:10.720 That's a simple one to do. 00:05:10.760 --> 00:05:15.240 We're a group of feisty Americans and our honorary American in Greg. 00:05:15.280 --> 00:05:17.400 We're going to be there. We're going to put up a fight. 00:05:17.440 --> 00:05:19.520 Do you want to try it out? Just do it, man. Just do it. 00:05:19.560 --> 00:05:21.280 We all seem to have a sense of humour. 00:05:21.320 --> 00:05:24.160 I reckon these two are really going to * heads together. 00:05:24.200 --> 00:05:26.440 HE MUMBLES And they're going to be like this. 00:05:26.480 --> 00:05:28.760 I'll be the one to calm you guys down, I reckon. 00:05:28.800 --> 00:05:30.720 I think you're going to be the trash talker, too. 00:05:30.760 --> 00:05:32.360 I was just going to say that. 00:05:32.400 --> 00:05:34.240 I'm going to kick like this. 00:05:34.280 --> 00:05:36.840 I think, with the three of us together, we'll take them down. 00:05:36.880 --> 00:05:39.120 What he said. 00:05:39.160 --> 00:05:41.640 ALL: One, two, three, Wild Cards! 00:05:42.800 --> 00:05:45.000 Team Wild Card... Hello. Good morning. 00:05:45.040 --> 00:05:47.480 ..do you have a plan just for this first space? 00:05:47.520 --> 00:05:50.440 Have you got any actual machines, builds, bits that will go in here? 00:05:50.480 --> 00:05:52.840 We have the slide, the ball, we have the goal. 00:05:52.880 --> 00:05:55.160 We have this little paddling pool. 00:05:55.200 --> 00:05:57.360 We're really going to try to maximise the space 00:05:57.400 --> 00:05:59.240 and use everything, but more importantly, 00:05:59.280 --> 00:06:01.280 we're going to try to work around the room. 00:06:01.320 --> 00:06:02.680 It's going to look amazing. 00:06:02.720 --> 00:06:05.360 Their amazing plan is to knock a chair 00:06:05.400 --> 00:06:07.840 that sends a ball down a slide into a goal. 00:06:07.880 --> 00:06:09.120 This triggers a rat trap 00:06:09.160 --> 00:06:10.320 that drops a weight, 00:06:10.360 --> 00:06:12.200 sending a towel across a washing line, 00:06:12.240 --> 00:06:13.800 which drops into a paddling pool, 00:06:13.840 --> 00:06:15.840 creating a splash that tips a bucket, 00:06:15.880 --> 00:06:19.360 causing a toy car to start a ball run into the hallway. 00:06:19.400 --> 00:06:21.400 It's totally baffling. 00:06:21.440 --> 00:06:23.400 Once you solve the pulley, the rest will follow. 00:06:23.440 --> 00:06:25.240 Well, first, we have to figure out the towel, 00:06:25.280 --> 00:06:26.920 since that's part of the actual action. 00:06:26.960 --> 00:06:29.440 No, I think the towel is probably the simplest part. 00:06:29.480 --> 00:06:31.880 The chaps are out of their comfort zones, 00:06:31.920 --> 00:06:34.000 working out the best way to hang the washing. 00:06:34.040 --> 00:06:36.120 We have a lot to do. We really don't have any time. 00:06:36.160 --> 00:06:39.760 They need the pulley to be strong to avoid the towel falling early, 00:06:39.800 --> 00:06:43.120 but precarious enough so that it falls when they want it to. 00:06:43.160 --> 00:06:45.240 We're going to want to glue it, as well, 00:06:45.280 --> 00:06:46.800 cos we can't have it rotating. 00:06:46.840 --> 00:06:49.240 Yeah, I'd have just used the tumble dryer. 00:06:49.280 --> 00:06:50.880 That's better. Meanwhile... 00:06:50.920 --> 00:06:53.720 You can't do it like that, Robert, cos it'll interfere with your ball. 00:06:53.760 --> 00:06:55.640 ..I may have come at a bad time. 00:06:55.680 --> 00:06:59.040 Morning, Team Aviators. We all well? Yes. Yeah, good, thank you. 00:06:59.080 --> 00:07:01.840 So, the mission begins. Have you got a plan? 00:07:01.880 --> 00:07:05.080 The plan is we're going to make a simple machine that works, 00:07:05.120 --> 00:07:07.640 and then we're going to add complexity. 00:07:07.680 --> 00:07:09.320 Oh, right. So, you start with the basics 00:07:09.360 --> 00:07:10.720 and then you build out from there. 00:07:10.760 --> 00:07:13.400 Sounds to me like there's been some strategic thinking 00:07:13.440 --> 00:07:14.880 and planning going on here. 00:07:14.920 --> 00:07:17.160 Yeah, we've got responsibility for a room each, 00:07:17.200 --> 00:07:18.480 so this room's Albert's. 00:07:18.520 --> 00:07:20.080 I'm going to do the middle room and... 00:07:20.120 --> 00:07:22.040 And I've got the kitchen with the yapping dogs. 00:07:22.080 --> 00:07:23.680 This is going to be really interesting. 00:07:23.720 --> 00:07:26.040 If this works, this could change everything. If it works. 00:07:26.080 --> 00:07:27.560 Well, I did say "if". 00:07:27.600 --> 00:07:30.120 Captain Albert's plan is to switch on a fan, 00:07:30.160 --> 00:07:32.000 releasing a pin from a parasol 00:07:32.040 --> 00:07:34.520 that starts a ball run that knocks a broom, 00:07:34.560 --> 00:07:37.560 starting a run of big wooden dominoes to exit the garden. 00:07:37.600 --> 00:07:40.360 He'll add complexity as they build. 00:07:40.400 --> 00:07:41.960 No, mate, I've got it. Don't worry. 00:07:42.000 --> 00:07:44.920 Paul and Steve are working on a base for the fan. 00:07:44.960 --> 00:07:47.360 I'm all right with these cos you can't lose an arm on these. 00:07:48.760 --> 00:07:52.920 MACHINE WHIRS Ooh, that sounds exciting. 00:07:52.960 --> 00:07:54.920 There's nothing like the sound of a mitre saw 00:07:54.960 --> 00:07:57.080 to put the willies up the other team. You reckon? 00:07:57.120 --> 00:08:00.080 Hello, other team! We're using the big saws! 00:08:00.120 --> 00:08:01.880 Yeah, we're using the big boys' tools. 00:08:01.920 --> 00:08:05.120 All right, I'm going to go see if they have any good ideas. 00:08:05.160 --> 00:08:08.480 Oh, Nick's taken the bait. What's up, guys? 00:08:08.520 --> 00:08:10.800 Yeah, you guys doing all right over here? 00:08:10.840 --> 00:08:13.280 Well, we're getting there. Wow! 00:08:13.320 --> 00:08:16.480 Looks like you have one thing done. I wish we had this much done. 00:08:17.640 --> 00:08:20.440 Yeah, you're having us on. You've got loads done, haven't you? 00:08:20.480 --> 00:08:23.160 We might, or we might just need some ideas, 00:08:23.200 --> 00:08:25.760 so we're just going to copy what you guys do. Oh, yeah. OK. 00:08:25.800 --> 00:08:28.320 Did you just try and sabotage us, then? Did we miss you? 00:08:28.360 --> 00:08:29.720 There's no sabotage here, 00:08:29.760 --> 00:08:33.360 just friendly exchange of ideas that may or may not waste your time. 00:08:33.400 --> 00:08:36.280 Reconnaissance mission over and pulley complete... 00:08:37.880 --> 00:08:41.080 This is probably the riskiest part. It's touch and go. 00:08:41.120 --> 00:08:42.880 ..Nick's throwing in the towel... 00:08:42.920 --> 00:08:45.600 Yay! Oh, it falls in the pool. Oh... 00:08:45.640 --> 00:08:48.320 ..only to worry it won't cause a big enough splash 00:08:48.360 --> 00:08:49.800 to trigger the toy car. 00:08:49.840 --> 00:08:51.840 If we're going to have that displacement, 00:08:51.880 --> 00:08:53.840 what's going to cause the displacement? 00:08:53.880 --> 00:08:56.133 Where's that boat? Can we drop 00:08:56.157 --> 00:08:57.040 the boat into the water? Right here. 00:08:57.080 --> 00:08:58.320 Wait, yeah. 00:08:58.360 --> 00:09:00.480 They're using a toy boat instead 00:09:00.520 --> 00:09:02.680 and putting the pool on an angled platform 00:09:02.720 --> 00:09:05.120 so the water displaced should be easily caught 00:09:05.160 --> 00:09:07.280 by the bucket that triggers the toy car. 00:09:08.360 --> 00:09:11.520 It's got to be balanced a certain way. 00:09:11.560 --> 00:09:13.520 It's got to be positioned a certain way. 00:09:13.560 --> 00:09:15.240 It's not working. 00:09:15.280 --> 00:09:17.080 Meanwhile... 00:09:17.120 --> 00:09:18.520 Our friend, the gnome, 00:09:18.560 --> 00:09:21.400 is probably going to ride the skateboard down a ramp, 00:09:21.440 --> 00:09:23.120 which switches on your fan. 00:09:23.160 --> 00:09:25.480 Paul's more complex trigger mechanism 00:09:25.520 --> 00:09:27.880 now also features some artwork. 00:09:29.320 --> 00:09:30.880 Ball's going in. 00:09:30.920 --> 00:09:34.160 Steve's perfected the end of Albert's ball run, too... 00:09:36.800 --> 00:09:38.160 It worked. It does it. 00:09:38.200 --> 00:09:40.480 ..but they're still worried it's too simple. 00:09:40.520 --> 00:09:44.320 We can't go simple. We've got to get some complexity in it. 00:09:44.360 --> 00:09:48.280 So, meet Yorkshire's very own Inspector Clouseau. 00:09:48.320 --> 00:09:52.440 What's going on here, guys? This looks remarkably familiar. 00:09:52.480 --> 00:09:55.240 Really? Look at that. We had this first. 00:09:55.280 --> 00:09:58.040 Oh, now, come on, guys. You never had that idea before. 00:09:58.080 --> 00:09:59.400 The truth is, you guys need help, 00:09:59.440 --> 00:10:01.320 and you're just trying to steal ideas from us. 00:10:01.360 --> 00:10:03.200 So, if we show you how it works, you'll be like, 00:10:03.240 --> 00:10:05.160 "Oh, yeah, that's what we should be doing." 00:10:05.200 --> 00:10:07.880 We're not saying any more because we know you're picking our brains 00:10:07.920 --> 00:10:10.240 and you're stealing our ideas, so we're going. 00:10:10.280 --> 00:10:13.800 See you later, Aviators. I like how they think we're copying them. 00:10:13.840 --> 00:10:16.360 The gamesmanship is off the scale, 00:10:16.400 --> 00:10:19.720 but Zach's only interested in the machines. 00:10:19.760 --> 00:10:23.040 The Aviators appear to be executing their plan - 00:10:23.080 --> 00:10:25.040 build a simple machine that can do it, 00:10:25.080 --> 00:10:26.600 and then build out from there 00:10:26.640 --> 00:10:28.960 with extra elements with whatever time you've got left. 00:10:29.000 --> 00:10:31.840 It's clever. It is clever...on paper. 00:10:31.880 --> 00:10:35.400 Reality, though - you're just going to add simple on top of simple. 00:10:35.440 --> 00:10:37.040 Well, let's see where they take it. 00:10:37.080 --> 00:10:40.720 Very, very different approach from the Wild Cards. Yes, absolutely. 00:10:40.760 --> 00:10:44.040 They're the kind of people that they look at something and go, 00:10:44.080 --> 00:10:46.000 "Ooh, we can do something with this. 00:10:46.040 --> 00:10:48.080 "Ooh, this is really cool. Let's add this here." 00:10:48.120 --> 00:10:50.120 The more of that you have, the better the machine. 00:10:50.160 --> 00:10:52.720 You just want to see that fun, that sense of comedy in there. 00:10:52.760 --> 00:10:54.440 It's the child in me, you know? 00:10:54.480 --> 00:10:57.760 Oh, it's going to feel so good when we go for a swim. 00:10:57.800 --> 00:11:00.280 We won't tighten it yet. We'll just leave it slackish. 00:11:00.320 --> 00:11:04.840 Teams, you have three hours left! 00:11:04.880 --> 00:11:07.200 That's three hours that you have left 00:11:07.240 --> 00:11:08.800 is what you have left. HE GROANS 00:11:08.840 --> 00:11:10.400 Right, carry on. 00:11:10.440 --> 00:11:12.160 With the end of day one approaching, 00:11:12.200 --> 00:11:14.600 the Wild Cards need to perfect their pool 00:11:14.640 --> 00:11:16.880 and join the toy car to the ball run... 00:11:16.920 --> 00:11:18.760 Ah, we're going to need a lot more water. 00:11:18.800 --> 00:11:20.640 So, we're making that high, then? Yeah. 00:11:20.680 --> 00:11:23.280 ..while Albert's replacing the dominoes with a tower 00:11:23.320 --> 00:11:26.240 he wants to knock over with a broom on a zip wire 00:11:26.280 --> 00:11:29.440 that may or may not look like the Wild Cards' washing line. 00:11:29.480 --> 00:11:32.120 We'll get that done cos we've not got long. 00:11:32.160 --> 00:11:34.240 It's a bit like you're making a gear knob, isn't it? 00:11:34.280 --> 00:11:36.560 It is like that, isn't it? Put a bit more glue on it. 00:11:36.600 --> 00:11:37.880 Yeah, that'll do it. 00:11:37.920 --> 00:11:39.800 The flying broom should be released 00:11:39.840 --> 00:11:42.240 when the ball run hits the ping-pong. 00:11:42.280 --> 00:11:45.040 That'll do it, won't it? Just a bit like that. Yeah. 00:11:45.080 --> 00:11:47.200 The duck can be the trigger. Leave it like that. 00:11:47.240 --> 00:11:49.160 The Wild Cards aren't being left behind. 00:11:53.360 --> 00:11:55.440 High five, guys. That part worked. 00:11:55.480 --> 00:11:57.840 Nick's made a falling duck tip the bucket 00:11:57.880 --> 00:12:00.280 that's connected to the car's remote control, 00:12:00.320 --> 00:12:03.840 and the car will now hit a mousetrap that starts the ball run 00:12:03.880 --> 00:12:07.080 by yanking some string that breaks some lolly sticks. 00:12:07.120 --> 00:12:09.200 Speaking of ball runs... 00:12:09.240 --> 00:12:12.240 Chaps, we in no way discourage industrial espionage. 00:12:12.280 --> 00:12:13.760 I think it's great fun. 00:12:13.800 --> 00:12:16.720 And, Nick, I have spotted you, a couple of times, waddling over... 00:12:16.760 --> 00:12:19.200 Yes. ..to see what the Aviators are doing. I'm quite curious. 00:12:19.240 --> 00:12:20.640 Have you learned anything from it? 00:12:20.680 --> 00:12:23.680 Yes, I have learned that their design is ridiculous. 00:12:23.720 --> 00:12:25.240 Right. I'm very intrigued. 00:12:25.280 --> 00:12:27.600 They do have some big, bold design going on, 00:12:27.640 --> 00:12:30.160 and they definitely have a lot of motion going across the room. 00:12:30.200 --> 00:12:33.400 Oh, yeah, thanks for wasting... It's marching on. ..two minutes of our time. 00:12:36.040 --> 00:12:37.920 That's a problem, isn't it? Teams! 00:12:37.960 --> 00:12:40.440 Teams, sorry to interrupt when you're this busy, 00:12:40.480 --> 00:12:43.120 but it's only to say half an hour till your first test run. 00:12:43.160 --> 00:12:45.280 Half an hour to be ready. Panic a bit. 00:12:45.320 --> 00:12:47.680 I'm not nervous. You're nervous. 00:12:47.720 --> 00:12:50.960 The Wild Cards are rushing the fiddly ball release... 00:12:52.240 --> 00:12:55.440 Ball didn't drop. All * are set, locked and loaded. 00:12:55.480 --> 00:12:57.120 ..while the Aviators are struggling 00:12:57.160 --> 00:13:00.080 to reliably knock over their new wooden tower. 00:13:01.280 --> 00:13:02.800 Ah-ha-ha! 00:13:02.840 --> 00:13:04.880 That sounded like it worked perfectly, guys. 00:13:04.920 --> 00:13:06.760 Reset? Reset. 00:13:06.800 --> 00:13:08.840 Ten seconds. Cut, cut, cut. Just cut. 00:13:08.880 --> 00:13:12.520 Seven. Seven. No, it's more like... I can't really see. 00:13:12.560 --> 00:13:15.160 No pressure, chaps. It's not really working any more. 00:13:15.200 --> 00:13:17.360 Four. It's three. Three. Two sec... 00:13:17.400 --> 00:13:21.400 Two sec... One. Time's up! No more time left! Tools down. 00:13:21.440 --> 00:13:25.760 Get set, ready for testing time. Good luck. Ah! 00:13:27.040 --> 00:13:29.200 The Aviators are testing first. 00:13:29.240 --> 00:13:31.960 They're hoping the gnome switches on the fan, 00:13:32.000 --> 00:13:34.000 blowing a picture onto a mouse trap, 00:13:34.040 --> 00:13:36.520 releasing a pin to start a ball run 00:13:36.560 --> 00:13:39.760 that eventually sends a broom to knock down a tower. 00:13:39.800 --> 00:13:42.120 You came with a plan, and I would say 00:13:42.160 --> 00:13:43.920 it looks like you have actually done that. 00:13:43.960 --> 00:13:46.400 Yeah, we stuck to the game plan. We just expanded on it. 00:13:46.440 --> 00:13:48.200 Start it in your own time, gents. Good luck. 00:13:48.240 --> 00:13:50.600 Steve, when you're ready. Chocks away! 00:13:59.920 --> 00:14:01.560 WHISPERS: I like the pace. 00:14:01.600 --> 00:14:03.560 The fact it's just one ball rolling throughout. 00:14:06.400 --> 00:14:08.440 I don't know what's happened! What's happened? 00:14:08.480 --> 00:14:10.760 The ball missed the target. It's never done that. 00:14:10.800 --> 00:14:13.680 A minor hiccup. After a perfect start, 00:14:13.720 --> 00:14:16.840 the ball that left the ball run didn't have the momentum 00:14:16.880 --> 00:14:20.040 to move the ping-pong, so the broom wasn't released. 00:14:21.440 --> 00:14:25.000 For the sake of seeing it complete, let's just see what happens with the rest of it. 00:14:25.040 --> 00:14:27.720 Here we go, then. We'll go again from where it should have gone. 00:14:27.760 --> 00:14:28.920 Oh, yes. 00:14:31.760 --> 00:14:34.880 Oh! It would have been perfect! Well done! 00:14:34.920 --> 00:14:36.240 Chaps, do you know what? 00:14:36.280 --> 00:14:39.000 One intervention is neither here nor there at this stage. 00:14:39.040 --> 00:14:41.280 Make that reliable, and that's looking good. 00:14:41.320 --> 00:14:44.680 Now the Wild Cards, who want the falling ball to hit the goal 00:14:44.720 --> 00:14:48.320 and trigger the washing-line pulley, dropping the boat into the pool, 00:14:48.360 --> 00:14:51.560 sending a duck into a bucket that activates a toy car 00:14:51.600 --> 00:14:52.880 that hits a mousetrap, 00:14:52.920 --> 00:14:55.680 triggering a ball run into the next room. 00:14:55.720 --> 00:14:57.840 Normally, at this point, before your first test run, 00:14:57.880 --> 00:15:00.240 I would be saying, "Which is the risky bit of your machine?" 00:15:00.280 --> 00:15:03.680 But I get the impression we're just looking at one big risk. 00:15:03.720 --> 00:15:06.920 Yeah. Yeah. It is definitely right on the edge 00:15:06.960 --> 00:15:09.320 of going by itself any second. 00:15:09.360 --> 00:15:12.160 If you're ready, Wild Cards, start your machine. 00:15:12.200 --> 00:15:13.800 All right, let's do it. 00:15:28.240 --> 00:15:31.000 BOTH:Yes!Chaps, it's only worked! APPLAUSE 00:15:31.040 --> 00:15:33.960 Well done! Clear run. Nice work. 00:15:35.280 --> 00:15:39.200 A perfect run with big splashes 00:15:39.240 --> 00:15:41.680 and intricate details 00:15:41.720 --> 00:15:44.440 that saw a cricket ball bounce into my hallway, 00:15:44.480 --> 00:15:46.400 ready for tomorrow's machine. 00:15:47.440 --> 00:15:49.840 We had a few problems, but we expected we'd have problems. 00:15:49.880 --> 00:15:52.520 I think we've learned a lesson - how quickly the time disappears. 00:15:52.560 --> 00:15:54.440 Yeah. Their machine was pretty great. 00:15:54.480 --> 00:15:56.840 I think there are some things we can learn from that, 00:15:56.880 --> 00:15:59.040 or might steal from that. THEY LAUGH 00:15:59.080 --> 00:16:02.320 Crikey! I'll have to ring the Old Bill tomorrow. 00:16:08.800 --> 00:16:12.080 I've set two engineering-mad teams a challenging task - 00:16:12.120 --> 00:16:15.760 build me a chain-reaction machine that will allow me to feed my dog 00:16:15.800 --> 00:16:19.400 without leaving my sun lounger here in my garden. 00:16:19.440 --> 00:16:20.880 In the garden on day one, 00:16:20.920 --> 00:16:23.200 the Aviators were a ping-pong from perfection... 00:16:24.480 --> 00:16:27.360 ..while the Wild Cards nailed it. 00:16:27.400 --> 00:16:29.120 BOTH: Yes! 00:16:29.160 --> 00:16:32.160 On day two, they have ten hours to create contraptions 00:16:32.200 --> 00:16:34.880 that cross my study and enter the kitchen, 00:16:34.920 --> 00:16:36.560 and I'm feeling mischievous. 00:16:36.600 --> 00:16:39.320 Morning, teams. Today, we want you to demonstrate 00:16:39.360 --> 00:16:42.080 a specific scientific principle in your bill - 00:16:42.120 --> 00:16:45.160 one of Newton's three laws of motion. 00:16:45.200 --> 00:16:49.320 Where and how you use it is up to you. Get building. 00:16:49.360 --> 00:16:51.520 Isaac Newton - the apple fell off his head. 00:16:51.560 --> 00:16:54.600 He's the man who discovered gravity. So, what are the three rules? 00:16:54.640 --> 00:16:57.920 Anything that starts not moving, and we hit it with something else, 00:16:57.960 --> 00:16:59.280 that's Newton's first law. 00:17:01.080 --> 00:17:04.640 Acceleration depends on the mass and the amount of force applied. 00:17:04.680 --> 00:17:06.960 The motion can be halted by a force. 00:17:07.000 --> 00:17:10.000 We put an apple on Richard's head and we shoot it off with an arrow. 00:17:10.040 --> 00:17:12.760 I'll let you do that bit. I'm a good shot. Yeah? 00:17:12.800 --> 00:17:15.800 Yeah, probably time to check with a professional. 00:17:20.800 --> 00:17:24.000 Newton's laws of motion describe how things move, 00:17:24.040 --> 00:17:25.800 and it's basically down to forces. 00:17:25.840 --> 00:17:28.800 When something is still, it's stationary, 00:17:28.840 --> 00:17:30.960 or if it's moving at a constant speed, 00:17:31.000 --> 00:17:33.600 so it's not speeding up or slowing down, 00:17:33.640 --> 00:17:35.480 all forces are balanced. 00:17:35.520 --> 00:17:37.560 And this is Newton's first law. 00:17:37.600 --> 00:17:40.120 If the forces acting on an object are balanced, 00:17:40.160 --> 00:17:41.680 it will remain at rest. 00:17:41.720 --> 00:17:43.440 Newton's second law says that, 00:17:43.480 --> 00:17:46.800 when the forces are out of balance, you can get acceleration. 00:17:46.840 --> 00:17:49.720 So, if I was to turn up the electric fans, 00:17:49.760 --> 00:17:53.040 you'd get a force wanting to accelerate the bike forward. 00:17:53.080 --> 00:17:56.880 Newton's third law of motion is what this bike is all about. 00:17:56.920 --> 00:17:59.680 Wherever you've got a force in one direction, 00:17:59.720 --> 00:18:03.160 you've got an equal and opposite force in the other direction, 00:18:03.200 --> 00:18:06.200 and that's exactly what's happening with these fans. 00:18:06.240 --> 00:18:08.440 The fans force air backwards, 00:18:08.480 --> 00:18:10.960 resulting in an equal and opposite force 00:18:11.000 --> 00:18:13.160 that accelerates the bike forwards. 00:18:13.200 --> 00:18:16.520 Woo! I can really feel that acceleration, 00:18:16.560 --> 00:18:20.520 the air being blown out the back, pushing me forwards. 00:18:24.160 --> 00:18:26.840 Just remember, force equals mass times acceleration. 00:18:30.000 --> 00:18:32.440 Oh, what the...? Yeah. It's not enough force. 00:18:34.520 --> 00:18:36.800 Well, I've got to ask right off the bat - 00:18:36.840 --> 00:18:40.040 are the dominoes part of your scientific principle today? 00:18:40.080 --> 00:18:43.480 They are. Basically, we have to increase the mass 00:18:43.520 --> 00:18:45.840 of the objects in order to have enough force 00:18:45.880 --> 00:18:48.960 to pull the toggle on the table. 00:18:49.000 --> 00:18:51.360 And do you think that's a creative way to demonstrate 00:18:51.400 --> 00:18:53.000 one of the laws of motion? 00:18:53.040 --> 00:18:55.560 Well, it's probably not the most creative way. 00:18:55.600 --> 00:18:57.760 That's the beginning. Have a think. 00:18:58.880 --> 00:19:00.400 Wow, OK. 00:19:00.440 --> 00:19:03.040 Zach's not impressed by how simple dominoes 00:19:03.080 --> 00:19:05.040 are being arranged to create enough force 00:19:05.080 --> 00:19:07.440 to topple a table and release a bowling ball. 00:19:12.760 --> 00:19:14.240 Hey! All right? 00:19:14.280 --> 00:19:17.920 I mean, it works, but Nick's clearly feeling insecure. 00:19:19.880 --> 00:19:22.240 Hello there. I noticed you guys got an aeroplane. 00:19:22.280 --> 00:19:24.600 Well, we're aviators. Are you going to fly it? 00:19:24.640 --> 00:19:26.200 The last time we showed you something, 00:19:26.240 --> 00:19:27.600 you ended up doing the same thing. 00:19:27.640 --> 00:19:29.800 Oh, I see something going on with these books, too. 00:19:29.840 --> 00:19:31.800 Looks like stuff's going to fall. 00:19:31.840 --> 00:19:34.480 Yeah, this is interesting. These guys are sneaky. 00:19:34.520 --> 00:19:38.320 Sneaky and probably jealous because this looks fun. 00:19:38.360 --> 00:19:40.440 Hey there, Aviators. Oh, hello. Hello. 00:19:40.480 --> 00:19:42.000 So, does that have anything to do with 00:19:42.040 --> 00:19:44.080 the Newton's laws that you have to incorporate? 00:19:44.120 --> 00:19:48.280 A plane is always about being in equal and opposite force, 00:19:48.320 --> 00:19:51.840 so you've got thrust over drag 00:19:51.880 --> 00:19:53.600 and lift over gravity. 00:19:54.760 --> 00:19:56.960 Their remote-control plane will spin 00:19:57.000 --> 00:19:59.040 with the air blown back from the props, 00:19:59.080 --> 00:20:01.840 creating an equal but opposite force forwards, 00:20:01.880 --> 00:20:05.200 so it rotates around a threaded rod, spinning a monkey 00:20:05.240 --> 00:20:09.360 until it's low enough to hit a sherry glass...obviously. 00:20:10.960 --> 00:20:12.440 How do we stop it? 00:20:12.480 --> 00:20:14.240 They're leaving the plane switched on, 00:20:14.280 --> 00:20:15.920 but with the circuit to the batteries 00:20:15.960 --> 00:20:18.000 shorted out by a playing card. 00:20:18.040 --> 00:20:20.760 Ah! It just ought to come down to doing it. 00:20:22.040 --> 00:20:26.160 And if we do this, it looks like we've had an accident. 00:20:26.200 --> 00:20:30.840 Albert's rigging a toy car to fall down a ramp onto a mousetrap... 00:20:30.880 --> 00:20:33.160 Cos that's the trigger. ..tugging a fishing wire 00:20:33.200 --> 00:20:36.200 that releases the card and completes the circuit. 00:20:36.240 --> 00:20:38.120 That's how it's supposed to work. 00:20:38.160 --> 00:20:42.000 This precise engineering should remove luck from the equation, 00:20:42.040 --> 00:20:43.960 keeping Zach very happy. 00:20:45.040 --> 00:20:49.000 What are you doing? I am about to try to demonstrate luck. Right. 00:20:49.040 --> 00:20:51.320 And there are often transitions that demonstrate that, 00:20:51.360 --> 00:20:54.360 where something might happen... Right. ..but it might not, 00:20:54.400 --> 00:20:56.480 and then it stops the rest of the machine. Exactly. 00:20:56.520 --> 00:20:58.680 I want to try to demonstrate a way to, well, 00:20:58.720 --> 00:20:59.971 remove luck from it. OK. 00:20:59.995 --> 00:21:00.840 So, let me show you. 00:21:00.880 --> 00:21:03.320 Here, we have one marble, 00:21:03.360 --> 00:21:05.360 and we want this marble to trigger that mousetrap 00:21:05.400 --> 00:21:06.640 to pull a string. OK. 00:21:06.680 --> 00:21:09.680 And something pulls the pin, which releases, and... 00:21:09.720 --> 00:21:10.960 It missed. Right. 00:21:11.000 --> 00:21:14.200 Cos that's just one marble and for one small target. 00:21:14.240 --> 00:21:16.560 Now, the natural reaction of teams would be, 00:21:16.600 --> 00:21:18.000 "Let's throw a whole lot at it." 00:21:18.040 --> 00:21:20.600 Is that going to work? Well, it's got a better chance, hasn't it? 00:21:20.640 --> 00:21:23.480 Definitely, but we still don't know. 00:21:23.520 --> 00:21:25.640 It didn't work, even with all those. 00:21:25.680 --> 00:21:28.480 So, let's add more trigger plates. 00:21:28.520 --> 00:21:29.600 Oh, I see. 00:21:33.240 --> 00:21:35.480 Didn't happen. Still missed. So, what would you do? 00:21:35.520 --> 00:21:39.000 So, what I want to show you is a way to trigger it every single time, 00:21:39.040 --> 00:21:40.480 and with one marble. 00:21:40.520 --> 00:21:43.440 This is actually something that... Ow. Now, pretend that didn't hurt. 00:21:43.480 --> 00:21:46.040 Don't style it out. You can have a little cry if you want. 00:21:46.080 --> 00:21:47.520 HE WAILS SOFTLY There you go. 00:21:47.560 --> 00:21:49.360 Anyway, what I'm going to do is 00:21:49.400 --> 00:21:52.360 increase the surface area on the target, 00:21:52.400 --> 00:21:54.760 so it doesn't matter where it exits. 00:21:56.440 --> 00:22:00.800 Again, we're back to one mousetrap and one ball. All right. Yet... 00:22:03.120 --> 00:22:04.440 It works. It'll now work. 00:22:04.480 --> 00:22:06.720 So, you've still got the same look and feel of risk, 00:22:06.760 --> 00:22:09.480 but you've taken luck out of the equation. Exactly. 00:22:09.520 --> 00:22:11.960 So, before you do anything else, do you need a nurse? 00:22:16.280 --> 00:22:20.040 Teams, I hate to be the bearer of bad news, 00:22:20.080 --> 00:22:22.480 but you have four hours left. 00:22:24.880 --> 00:22:27.160 With day two test runs getting closer, 00:22:27.200 --> 00:22:30.360 kleptomaniac Nick wants to create a clever bookcase. 00:22:30.400 --> 00:22:32.080 Wonder where he got that idea. 00:22:33.280 --> 00:22:35.760 Bowling ball's going to hit into the bottom of the bookcase. 00:22:35.800 --> 00:22:37.800 Obviously, I could pull a string or whatever, 00:22:37.840 --> 00:22:41.080 but the red team has that sort of books-falling-off-the-shelf thing, 00:22:41.120 --> 00:22:43.640 so now that's cool, and I kind of want to do something 00:22:43.680 --> 00:22:45.760 that has a similar action. 00:22:49.000 --> 00:22:50.640 This sincere form of flattery 00:22:50.680 --> 00:22:51.960 will see the bowling ball 00:22:52.000 --> 00:22:53.280 hit a series of levers, 00:22:53.320 --> 00:22:54.720 causing the bookcase shelves 00:22:54.760 --> 00:22:56.840 to collapse, unfurling a sign 00:22:56.880 --> 00:22:58.640 which releases a boxing glove 00:22:58.680 --> 00:23:00.720 that will smash into a chessboard, 00:23:00.760 --> 00:23:02.640 but they still don't have an end. 00:23:04.320 --> 00:23:08.280 Ooh, looks like the Aviators have had a tip-off. What's up, guys? 00:23:12.000 --> 00:23:15.160 Perfect. What did it do over there? Is that...? Nothing. 00:23:15.200 --> 00:23:18.760 Didn't do anything. OK. Is that your secret plan? 00:23:18.800 --> 00:23:20.680 Right, Albert, let's put your chains back on. 00:23:20.720 --> 00:23:23.400 See, the bowling ball worked great, man. That worked perfectly. 00:23:23.440 --> 00:23:25.120 I like that a lot. 00:23:25.160 --> 00:23:28.080 Unfazed, Albert's creating a rolling globe 00:23:28.120 --> 00:23:31.520 he wants to be triggered by the final falling book. 00:23:31.560 --> 00:23:33.602 Book came out, tape came off, 00:23:33.626 --> 00:23:36.160 ball went down. Beautiful. 00:23:36.200 --> 00:23:40.920 Teams, you have two hours! Two hours. Two hours left. 00:23:40.960 --> 00:23:44.160 Oh, I've done a thing. Sorry, I set that off. Richard! 00:23:44.200 --> 00:23:46.720 I might have done something. I'll go. 00:23:46.760 --> 00:23:50.000 Both teams still need to give their machines an ending. 00:23:50.040 --> 00:23:51.680 We want to make it like a pull shot. 00:23:51.720 --> 00:23:55.400 Shola wants to use a typewriter to knock a ball into the kitchen... 00:23:55.440 --> 00:23:57.880 This is just a tap, and this just rolls off. 00:23:57.920 --> 00:23:59.520 ..while the Aviators' idea 00:23:59.560 --> 00:24:02.160 won't exactly calm accusations of plagiarism. 00:24:04.040 --> 00:24:08.320 A remote-control car, just like the Wild Cards' yesterday. 00:24:08.360 --> 00:24:10.600 The complete machine will see 00:24:10.640 --> 00:24:13.040 the book cascade release the rolling globe, 00:24:13.080 --> 00:24:15.240 sending the tiny toy car down a ramp, 00:24:15.280 --> 00:24:16.640 hitting a mousetrap, 00:24:16.680 --> 00:24:19.840 starting their Newtonian plane that knocks the sherry glass, 00:24:19.880 --> 00:24:22.480 triggering the remote-control car. 00:24:22.520 --> 00:24:24.720 So, we can put a pivot maybe here. Yeah. 00:24:24.760 --> 00:24:26.680 They're attaching the car's controller 00:24:26.720 --> 00:24:29.480 to a fishing net that will catch the sherry glass. 00:24:29.520 --> 00:24:31.400 So, we go... 00:24:35.120 --> 00:24:38.120 LAUGHTER Wow! Like a rocket! 00:24:38.160 --> 00:24:41.120 Yeah, like that's not copying us, a remote-control car. 00:24:41.160 --> 00:24:44.080 We did that yesterday. Just saying. 00:24:45.160 --> 00:24:47.680 Hello, Wild Cards. Hello. Hey, how you doing? 00:24:47.720 --> 00:24:52.040 Wow. Yesterday's build looked like absolute chaos, 00:24:52.080 --> 00:24:55.400 but today's does, as well. HE LAUGHS 00:24:55.440 --> 00:24:57.160 But one thing different about today - 00:24:57.200 --> 00:24:58.720 we're actually testing the designs. 00:24:58.760 --> 00:25:00.280 This is a whole new thing for you guys - 00:25:00.320 --> 00:25:02.000 actually testing stuff. Whole new thing. 00:25:02.040 --> 00:25:04.720 You borrowed this yesterday from the Aviators. 00:25:04.760 --> 00:25:07.080 Have you borrowed anything else from the Aviators today? 00:25:07.120 --> 00:25:08.960 In fact, I think they borrowed from us 00:25:09.000 --> 00:25:11.760 because I saw a remote-control car in their build today. 00:25:11.800 --> 00:25:14.640 That's right. And I'm pretty sure we used that yesterday. 00:25:14.680 --> 00:25:16.480 Yep. Pretty sure. Ah! 00:25:17.920 --> 00:25:19.120 An hour left. 00:25:19.160 --> 00:25:21.120 The Wild Cards are hoping to impress 00:25:21.160 --> 00:25:23.480 with some mysterious floating glasses 00:25:23.520 --> 00:25:25.000 and adjoining the chessboard table 00:25:25.040 --> 00:25:27.880 to the typewriter with fishing wire... OK. 00:25:29.240 --> 00:25:32.120 Amazing. Love it when a plan comes together. 00:25:32.160 --> 00:25:34.640 ..while the Aviators are downing tools 00:25:34.680 --> 00:25:36.600 and joining their lips to a mug again. 00:25:36.640 --> 00:25:38.400 Let's take the tea over and look at it, then. 00:25:38.440 --> 00:25:39.680 We haven't got any biscuits. 00:25:41.240 --> 00:25:43.760 Aviators... Hello. Hi. 00:25:43.800 --> 00:25:46.440 ..what I notice you're not doing 00:25:46.480 --> 00:25:48.480 is anything. 00:25:48.520 --> 00:25:50.920 Yeah, we're thinking. It's a pilot thing. 00:25:50.960 --> 00:25:53.720 Yesterday, I'm not saying you made a fuss, 00:25:53.760 --> 00:25:58.720 but you did point out that the Wild Cards had taken your ball idea. 00:25:58.760 --> 00:26:00.040 Yeah. They did. 00:26:00.080 --> 00:26:04.440 They just told me that you've taken their remote-control car idea. 00:26:04.480 --> 00:26:07.080 No, we had that from day one, but were saving it for the study. 00:26:07.120 --> 00:26:10.520 Oh, I see. So, they copied you the day before you did it? 00:26:10.560 --> 00:26:12.680 Inside information. Clever. 00:26:12.720 --> 00:26:15.160 All right, chop, chop. Come on. 15 minutes to go. 00:26:15.200 --> 00:26:17.160 Shola, come on, man. Come on, we're doing this. 00:26:17.200 --> 00:26:18.760 We've just got to make this part work. 00:26:20.720 --> 00:26:23.200 The Wild Cards are struggling to finish... Oh, it missed. 00:26:23.240 --> 00:26:25.800 That's why we test them. Right, let's redo this. 00:26:25.840 --> 00:26:26.960 Oh, Lord! 00:26:27.000 --> 00:26:30.240 ..and the Aviators are struggling to even look busy. 00:26:30.280 --> 00:26:31.920 Ten seconds, teams. 00:26:31.960 --> 00:26:33.960 Yeah, act busy, act busy! 00:26:34.000 --> 00:26:35.400 No, it's still not doing it. 00:26:35.440 --> 00:26:39.746 Five, four, three, two, one! 00:26:39.770 --> 00:26:41.720 Time is up! 00:26:41.760 --> 00:26:43.800 That was pretend panic! 00:26:43.840 --> 00:26:46.040 Tools down, everybody. No more building. 00:26:46.080 --> 00:26:50.480 Time to get ready to test stage two of your chain-reaction machines, 00:26:50.520 --> 00:26:54.560 and trust me when I say expectations are going to be high. 00:26:54.600 --> 00:26:56.720 After their brazen early finish, 00:26:56.760 --> 00:26:59.640 only a perfect run is good enough for the Aviators. 00:26:59.680 --> 00:27:02.840 Aviators, you chose to stop doing anything 00:27:02.880 --> 00:27:05.800 about an hour and a half ago, so you must be dead-certain. 00:27:05.840 --> 00:27:08.120 Confident, aren't we? It's going to work. It'll be fine. 00:27:08.160 --> 00:27:10.600 We've kept it clean, simple, and stuck to the principle. 00:27:10.640 --> 00:27:14.280 They want spinning bottles to start a cascade of falling books, 00:27:14.320 --> 00:27:17.400 causing a rolling globe to send a car down a track 00:27:17.440 --> 00:27:19.960 that turns on their Newtonian spinning plane, 00:27:20.000 --> 00:27:22.440 which, via a monkey toppling a sherry glass, 00:27:22.480 --> 00:27:25.320 should send a remote-control car into the kitchen. 00:27:26.720 --> 00:27:28.200 Chaps, in your own time, 00:27:28.240 --> 00:27:31.160 start stage two of your chain-reaction machine, please. 00:27:31.200 --> 00:27:32.200 Over to you, Albert. 00:27:39.720 --> 00:27:42.000 Is it cold in here or is it just me? Mm-hm. Definitely! 00:27:43.080 --> 00:27:46.680 The agonising failure was down to a poorly fitted hook, 00:27:46.720 --> 00:27:48.360 which came free in mid-air, 00:27:48.400 --> 00:27:50.680 preventing it from tugging the next book 00:27:50.720 --> 00:27:52.520 and breaking the chain. 00:27:52.560 --> 00:27:54.160 Probably what should happen is 00:27:54.200 --> 00:27:57.200 Albert should go over there and pull the remaining book off. 00:27:57.240 --> 00:28:00.320 If it goes wrong again, there'll be some very red faces. 00:28:16.040 --> 00:28:17.480 Oh, I love that. 00:28:23.640 --> 00:28:26.840 We're through, chaps. Well done. APPLAUSE 00:28:26.880 --> 00:28:29.000 After the embarrassing hiccup, 00:28:29.040 --> 00:28:33.240 the Aviators reclaim some dignity with a successful test run, 00:28:33.280 --> 00:28:36.280 sending the toy car into the kitchen. 00:28:36.320 --> 00:28:40.040 The Wild Cards will be desperate to retaliate with a perfect test. 00:28:40.080 --> 00:28:42.640 Wild Cards, you reckon you've pulled it out of the hat with this? 00:28:42.680 --> 00:28:45.120 I believe so. We just have to watch the magic happen, really. 00:28:45.160 --> 00:28:47.920 They want videotape dominoes to topple a table 00:28:47.960 --> 00:28:50.560 and release a bowling ball to collapse a bookcase, 00:28:50.600 --> 00:28:52.920 sending a boxing glove towards a chessboard 00:28:52.960 --> 00:28:55.120 on a table which tugs a fishing line, 00:28:55.160 --> 00:28:57.600 causing a typewriter to knock a ball. 00:28:57.640 --> 00:29:00.560 Gentlemen, if you're ready, start your machine, please. 00:29:00.600 --> 00:29:01.920 All right, let it rip. 00:29:15.280 --> 00:29:18.680 Oh, it's stalled! Release the boxing glove, man. 00:29:21.720 --> 00:29:23.000 Oh, no. 00:29:24.320 --> 00:29:25.800 That's two failures. 00:29:25.840 --> 00:29:28.040 The borrowed bookcase didn't fully collapse, 00:29:28.080 --> 00:29:31.720 and even after the boxing glove thoroughly smashed the chessboard, 00:29:31.760 --> 00:29:33.880 the typewriter missed the ball. 00:29:33.920 --> 00:29:35.809 Disappointed. 00:29:35.833 --> 00:29:36.680 A little deflated. Bit peed off. 00:29:36.720 --> 00:29:37.960 I was disappointed for them. 00:29:38.000 --> 00:29:40.360 You know, they've put a lot of work in. A lot of effort. 00:29:40.400 --> 00:29:42.560 Just going to step forward, never look back, 00:29:42.600 --> 00:29:43.840 just make it happen. 00:29:43.880 --> 00:29:46.920 We don't want them to fail, but we want to beat them. 00:29:46.960 --> 00:29:50.280 So, the gloves are off for the big day tomorrow. 00:29:53.840 --> 00:29:55.760 My dog loves being fed. 00:29:56.840 --> 00:29:58.680 I love lounging in my garden. 00:29:58.720 --> 00:30:01.480 And as my rivals arrive for the final day, 00:30:01.520 --> 00:30:04.920 they're hoping to finish machines that allow both to happen at once, 00:30:04.960 --> 00:30:08.360 after some quick repairs to yesterday's machines. 00:30:08.400 --> 00:30:10.960 That was what the problem was. Three, two, one. 00:30:12.440 --> 00:30:13.920 Oh, thank goodness. 00:30:16.000 --> 00:30:17.440 Morning, teams. 00:30:17.480 --> 00:30:18.920 I think it's fair to say 00:30:18.960 --> 00:30:22.000 last night's test runs were suboptimal. 00:30:22.040 --> 00:30:24.120 Today, though, teams, it's time for the final push 00:30:24.160 --> 00:30:26.280 because you must build across the kitchen 00:30:26.320 --> 00:30:29.560 before running your machines in their entirety. 00:30:29.600 --> 00:30:34.080 And with so much to do, you do not need a spanner in the works, 00:30:34.120 --> 00:30:36.760 so I put a spanner in your workshop. 00:30:36.800 --> 00:30:38.400 It's not actually a spanner. 00:30:38.440 --> 00:30:40.720 It's a beautifully wrapped mystery object 00:30:40.760 --> 00:30:43.560 which you must incorporate into today's build. 00:30:43.600 --> 00:30:47.440 So, best of British, and, indeed, American. 00:30:47.480 --> 00:30:48.480 Good luck. 00:30:50.960 --> 00:30:54.120 Oh, we've got a dog lead! ALL: Oh! 00:30:54.160 --> 00:30:57.160 The teams need to come up with brilliantly creative uses 00:30:57.200 --> 00:30:58.840 to impress Zach... 00:30:58.880 --> 00:31:01.480 What are we going to do with that? Pull something along the floor. 00:31:01.520 --> 00:31:03.560 ..and - oh, dear - they're at it again. 00:31:03.600 --> 00:31:06.120 Maybe the red team will give us some ideas. Yeah. 00:31:06.160 --> 00:31:08.760 Food drops in, dog gets pulled across. 00:31:08.800 --> 00:31:10.920 Little do they know they've actually come up with 00:31:10.960 --> 00:31:13.760 the same ideas without resorting to industrial espionage. 00:31:13.800 --> 00:31:15.920 The dog leash can drag the dog to the food. 00:31:15.960 --> 00:31:19.440 So, let's just keep it quiet cos it's a great idea. 00:31:19.480 --> 00:31:21.840 Where we might simply see 00:31:21.880 --> 00:31:24.840 a device to help safely walk our furry friend, 00:31:24.880 --> 00:31:28.120 mechanical engineer Shini Somara sees an opportunity 00:31:28.160 --> 00:31:32.480 to lead us through some science and engineering. 00:31:32.520 --> 00:31:34.680 I retract that pun. I'm sorry. 00:31:35.680 --> 00:31:38.720 This is Pippin, and she's a very excitable little puppy, 00:31:38.760 --> 00:31:41.520 so using a retractable lead is perfect for her 00:31:41.560 --> 00:31:43.280 because when she runs off, 00:31:43.320 --> 00:31:46.440 the lead extends, winding up a coil in the handle, 00:31:46.480 --> 00:31:48.560 which is generating potential energy. 00:31:48.600 --> 00:31:51.320 When I lock it, I can store that potential energy, 00:31:51.360 --> 00:31:52.880 and when I release the lock, 00:31:52.920 --> 00:31:56.760 that potential energy is used to wind the lead back up. 00:31:58.120 --> 00:32:01.040 The teams could attach a weight to one end of the lead 00:32:01.080 --> 00:32:02.880 and then sling it over a fixed point 00:32:02.920 --> 00:32:05.200 and effectively create a very simple pulley 00:32:05.240 --> 00:32:08.760 where a downward force equals an upward force. 00:32:08.800 --> 00:32:13.520 Or the end of the lead could be fixed in place, 00:32:13.560 --> 00:32:15.760 and the weight of the handle could be used 00:32:15.800 --> 00:32:17.600 to create a controlled descent... 00:32:19.440 --> 00:32:23.320 ..potentially triggering the next chain reaction. 00:32:23.360 --> 00:32:26.040 Sounds simple, but the suspicious rivals 00:32:26.080 --> 00:32:29.840 are still reluctant to reveal their dog-lead ideas. 00:32:29.880 --> 00:32:32.560 It just needs to be held down by something, 00:32:32.600 --> 00:32:34.640 and this will roll. Yeah. 00:32:34.680 --> 00:32:36.680 Shola's experimenting with a chair... 00:32:38.200 --> 00:32:39.600 That's like the kill zone. 00:32:39.640 --> 00:32:44.240 ..while Paul's planning something, hopefully not for my dog... 00:32:44.280 --> 00:32:46.000 We've got a plan. 00:32:46.040 --> 00:32:48.000 ..and Greg can't help himself. 00:32:48.040 --> 00:32:50.120 Morning, boys. So, what's this you're working on? 00:32:50.160 --> 00:32:52.600 If we get people coming from other teams, 00:32:52.640 --> 00:32:55.720 that chops them, so be careful. 00:32:55.760 --> 00:32:57.320 Yeah, I'd steer clear. 00:32:57.360 --> 00:33:00.120 We'll come and check yours out soon, eh? 00:33:00.160 --> 00:33:03.280 Leads left alone, Nick's experimenting with scales 00:33:03.320 --> 00:33:06.240 as a way to start their kitchen machine. 00:33:06.280 --> 00:33:08.360 OK, drop that in. Drop that in there. 00:33:08.400 --> 00:33:10.040 Will it drop in there? 00:33:10.080 --> 00:33:11.400 Clearly. Yeah. Clearly. 00:33:11.440 --> 00:33:12.855 But if it hits one of these, 00:33:12.879 --> 00:33:14.480 it's not going to work. Yeah. 00:33:14.520 --> 00:33:18.240 If it works, the tipping scales will release an apple, 00:33:18.280 --> 00:33:20.400 triggering a nail to pop a balloon, 00:33:20.440 --> 00:33:21.880 which drops a tablecloth 00:33:21.920 --> 00:33:23.760 which releases a spoon tetherball, 00:33:23.800 --> 00:33:25.760 sending a skateboard down a ramp. 00:33:25.800 --> 00:33:27.320 It just lacks an end 00:33:27.360 --> 00:33:28.960 and the dog lead. 00:33:30.400 --> 00:33:31.960 With over an hour gone, 00:33:32.000 --> 00:33:35.640 Nick's tea towel is a fast way to catch the ball reliably. 00:33:36.920 --> 00:33:39.800 Today, we have, like, two hours less overall 00:33:39.840 --> 00:33:42.960 because not only do we have to test this, 00:33:43.000 --> 00:33:46.680 but then we also have to rebuild and test the whole thing as one. 00:33:46.720 --> 00:33:49.200 No rushing with their rivals. 00:33:49.240 --> 00:33:51.680 Put a door across there and have a little peg in here. 00:33:51.720 --> 00:33:55.240 The Aviators are taking their tea obsession to another level... 00:33:55.280 --> 00:33:56.880 Knock that pin out. 00:33:56.920 --> 00:33:59.400 This is where we're going to be doing the water thing here, eh? 00:33:59.440 --> 00:34:02.360 ..using a tea urn at the start of their machine. 00:34:02.400 --> 00:34:04.520 Oh, look at that. Perfecto. 00:34:06.640 --> 00:34:08.760 They want the car from the hallway 00:34:08.800 --> 00:34:11.640 to trigger the urn handle to start a water run, 00:34:11.680 --> 00:34:14.760 filling a bucket on a seesaw that starts a food mixer, 00:34:14.800 --> 00:34:17.040 which winds a string to release a machete, 00:34:17.080 --> 00:34:18.560 which slices a cucumber 00:34:18.600 --> 00:34:21.440 that drops and releases a tube of doggy treats. 00:34:23.680 --> 00:34:25.480 By the time that we finish this room, 00:34:25.520 --> 00:34:27.280 everybody's going to want a wee. 00:34:27.320 --> 00:34:30.640 It's looking good, but it's not got a dog lead in it. 00:34:30.680 --> 00:34:31.960 Get the kettle on. 00:34:32.000 --> 00:34:35.280 The Aviators are enjoying the drinks trolley... Cup of tea. 00:34:35.320 --> 00:34:38.240 ..while the Wild Cards are experiencing turbulence. 00:34:38.280 --> 00:34:41.160 I just came to see what has evolved on this side. 00:34:41.200 --> 00:34:43.360 We don't have time to sit around staring at each other. 00:34:43.400 --> 00:34:45.280 Standing around watching each other work 00:34:45.320 --> 00:34:46.800 isn't going to get anything done. 00:34:46.840 --> 00:34:49.720 Shola's worried about the scales taking too long. 00:34:49.760 --> 00:34:52.840 Yeah, it's a bit more tense. Those two are always bickering. 00:34:52.880 --> 00:34:54.680 I'm the more calm one. I'm the calm one. 00:34:54.720 --> 00:34:55.960 Yeah, I'm sorry about that. 00:34:56.000 --> 00:34:58.480 I'm feeling under pressure, man. I feel the pressure now. 00:34:58.520 --> 00:34:59.800 You know what I'm saying? Yeah. 00:34:59.840 --> 00:35:02.320 Perhaps they should stop for a calming, milky tea. 00:35:02.360 --> 00:35:03.760 Actually, maybe not. 00:35:03.800 --> 00:35:08.480 Teams, you have five hours to complete your machines! 00:35:08.520 --> 00:35:10.440 Carry on! Are you having a laugh? 00:35:10.480 --> 00:35:12.560 I don't think he is. 00:35:12.600 --> 00:35:14.440 Guess it's time to start doing some work. 00:35:20.760 --> 00:35:22.880 With the start of their machine nailed... 00:35:22.920 --> 00:35:24.520 We've got something going here. 00:35:24.560 --> 00:35:27.400 ..the Wild Cards are creating the swinging spoon in the middle. 00:35:27.440 --> 00:35:30.400 So, it starts unwinding, getting wider as it spins, 00:35:30.440 --> 00:35:32.680 looking like the plane they did yesterday. 00:35:32.720 --> 00:35:35.720 Careful, Shola. Remember what happens to spies? 00:35:37.280 --> 00:35:38.600 Record player's on. 00:35:38.640 --> 00:35:41.240 The Aviators are working on their middle stage, too, 00:35:41.280 --> 00:35:43.640 attempting to use the spinning food processor 00:35:43.680 --> 00:35:47.160 to release the machete. Here we go. Is it moving? 00:35:51.000 --> 00:35:53.280 Oh! OK, stop. Seems to be going well. 00:35:53.320 --> 00:35:54.400 That was... 00:35:54.440 --> 00:35:56.600 Dude, do you know where those small plastic * are? 00:35:56.640 --> 00:35:58.800 The ones that look like this? I know I had three... 00:35:58.840 --> 00:36:02.800 We had a bunch of them, but they've mysteriously all disappeared. 00:36:02.840 --> 00:36:04.760 Erm, the Aviators' legal team 00:36:04.800 --> 00:36:07.560 have asked me to make no comment here. 00:36:07.600 --> 00:36:09.080 Pull that. Ready? 00:36:10.200 --> 00:36:11.280 Perfect, mate. 00:36:12.640 --> 00:36:15.800 Hello, Aviators. Hello, Richard. You're working on this, 00:36:15.840 --> 00:36:18.160 which I'm guessing that's the end of it. 00:36:18.200 --> 00:36:20.800 Yeah. But does everything else connect up to it? 00:36:20.840 --> 00:36:23.760 We haven't tested it... Right. ..completely yet. 00:36:23.800 --> 00:36:26.080 The other thing you haven't done is, as far as I can see... 00:36:26.120 --> 00:36:28.920 That's the retracting dog leash that you need to integrate, 00:36:28.960 --> 00:36:30.640 but you haven't done anything with it yet. 00:36:30.680 --> 00:36:34.240 We're hoping to put that onto a dog. The dog will go over and get fed. 00:36:34.280 --> 00:36:35.760 It's a lovely touch. 00:36:35.800 --> 00:36:39.320 Right, I'm going to leave you to it because you've got a ton to do. 00:36:40.520 --> 00:36:41.920 Two hours to go... 00:36:41.960 --> 00:36:44.160 This thing always turns slightly to the right. 00:36:44.200 --> 00:36:46.200 ..and Shola's creating an ending. 00:36:46.240 --> 00:36:48.760 I found an extra step to make this look a little flashier. 00:36:48.800 --> 00:36:52.080 As the cupboard is opened by the fan... That's your trigger. 00:36:52.120 --> 00:36:56.160 ..it should release the chair on a bungee and tip the dog food. 00:36:56.200 --> 00:37:00.440 Wild Cards... ALL: Hello. ..in the midst of all this chaos, 00:37:00.480 --> 00:37:03.040 that's the final piece in the machine. 00:37:03.080 --> 00:37:04.920 It starts here at this door. Yeah. 00:37:04.960 --> 00:37:07.400 What about, like, everything in between getting to there? 00:37:07.440 --> 00:37:09.520 Erm, the good news is this, actually, 00:37:09.560 --> 00:37:11.680 believe it or not, is done, figured out. 00:37:11.720 --> 00:37:13.920 We're about to finish figuring this part out. 00:37:13.960 --> 00:37:16.040 There's beauty in the madness. 00:37:16.080 --> 00:37:17.880 One thing I don't see any evidence of 00:37:17.920 --> 00:37:20.000 is you using the retractable dog leash. 00:37:20.040 --> 00:37:21.480 It actually plays a key role. 00:37:21.520 --> 00:37:24.400 And you're not going to tell me any more than that? No. No. 00:37:26.400 --> 00:37:30.640 This game of dog-lead chicken isn't impressing the maestro. 00:37:30.680 --> 00:37:32.960 Zach, less than an hour left, and - I don't know - 00:37:33.000 --> 00:37:35.880 I'm getting the sense neither team is where it wants to be. 00:37:35.920 --> 00:37:37.120 No, definitely not. 00:37:37.160 --> 00:37:40.120 They haven't done a full test, not in any of the rooms, so far. 00:37:40.160 --> 00:37:42.600 And, critically, has either team integrated 00:37:42.640 --> 00:37:46.280 and used the retracting dog leash surprise item properly? 00:37:46.320 --> 00:37:48.880 Not until the last couple of minutes. 00:37:48.920 --> 00:37:52.000 When I look at the Wild Cards, it's just been incorporated 00:37:52.040 --> 00:37:54.240 for triggering their oscillating fan, 00:37:54.280 --> 00:37:56.640 but mere minutes ago, I looked over at the Aviators, 00:37:56.680 --> 00:37:58.040 and it's just laying there. 00:37:58.080 --> 00:37:59.800 That's something you should incorporate 00:37:59.840 --> 00:38:01.560 right from the beginning, work around it. 00:38:01.600 --> 00:38:03.880 You do get quite indignant as the master of this stuff, 00:38:03.920 --> 00:38:06.800 but they've still got time. I want to see it get done. 00:38:06.840 --> 00:38:09.120 The rivals have given up on using the lead 00:38:09.160 --> 00:38:11.640 to drag the dog towards the food as planned. 00:38:11.680 --> 00:38:14.320 The Wild Cards are struggling to make their lead 00:38:14.360 --> 00:38:16.360 activate the fan reliably... 00:38:16.400 --> 00:38:18.920 The tape's not going to hold, bro. I know. 00:38:18.960 --> 00:38:21.320 ..and even the Aviators are getting stressed. 00:38:21.360 --> 00:38:23.640 We're up here spending 20 minutes fannying about... 00:38:23.680 --> 00:38:25.800 No, go on, then. ..looking at that. Talk to me again. 00:38:25.840 --> 00:38:27.080 Get it on something. 00:38:29.200 --> 00:38:32.000 Team, there is absolutely no need to panic. 00:38:32.040 --> 00:38:34.360 Well, there's quite some need to panic. 00:38:34.400 --> 00:38:36.920 You've only got 30 seconds left. You should panic. 00:38:36.960 --> 00:38:38.240 We are panicking. 00:38:38.280 --> 00:38:41.440 In the dying seconds, the Aviators are wedging their dog lead 00:38:41.480 --> 00:38:43.720 under the seesaw to trigger the mixer. 00:38:43.760 --> 00:38:45.760 It was a last-minute third idea 00:38:45.800 --> 00:38:48.360 because everything else was just getting far too complicated. 00:38:48.400 --> 00:38:51.280 It's only 20 now. I lied slightly. It moved on. 00:38:51.320 --> 00:38:53.640 Neither team has had time for a full run. 00:38:53.680 --> 00:38:55.899 No pressure at all. 15 seconds. 00:38:55.923 --> 00:38:58.440 Don't start anything big now. 00:38:58.480 --> 00:39:02.040 With a place in the semis at stake, this could be disastrous, 00:39:02.080 --> 00:39:04.240 especially for my hungry dog. 00:39:04.280 --> 00:39:07.840 Ten seconds. I'd just stay with most of it as it is. 00:39:07.880 --> 00:39:09.640 Five. 00:39:09.680 --> 00:39:13.600 Two. One second. One... It's gone. The time has gone. 00:39:13.640 --> 00:39:14.800 Tools down. 00:39:14.840 --> 00:39:18.040 You are now considered to have built your machines. 00:39:18.080 --> 00:39:20.360 I wish you all the very best. 00:39:20.400 --> 00:39:22.960 Do you see what the other team's doing over there? Yeah. 00:39:23.000 --> 00:39:25.640 That's pretty impressive. I mean, they might just kick our *. 00:39:32.600 --> 00:39:35.680 Welcome back. It's judgment day. 00:39:35.720 --> 00:39:39.120 After three days of building... It's not working. 00:39:39.160 --> 00:39:42.280 ..and stealing... This looks remarkably familiar. 00:39:42.320 --> 00:39:45.120 ..Zach will now pick which team's machine 00:39:45.160 --> 00:39:48.120 best feeds my dog from my sun lounger. 00:39:48.160 --> 00:39:50.960 I'll be judging on their creativity, ingenuity, 00:39:51.000 --> 00:39:52.240 number of transitions, 00:39:52.280 --> 00:39:54.520 and the incorporation of the scientific principle 00:39:54.560 --> 00:39:55.960 and the mystery object. 00:39:56.000 --> 00:39:57.320 If the machines stop, 00:39:57.360 --> 00:40:00.120 the teams are allowed to intervene up to three times, 00:40:00.160 --> 00:40:03.360 but the Aviators will be desperate for a clean run. 00:40:03.400 --> 00:40:06.000 Yesterday, you finished with two hours to spare 00:40:06.040 --> 00:40:09.480 to spend drinking tea, and there was a failure in that room. 00:40:09.520 --> 00:40:12.560 Today, you seemed to be working all the way to the end. 00:40:12.600 --> 00:40:13.960 All the way. 00:40:14.000 --> 00:40:16.800 Their kitchen machine should start with the dripping tea urn, 00:40:16.840 --> 00:40:19.240 tipping the seesaw, releasing the dog lead, 00:40:19.280 --> 00:40:21.800 starting the mixer that drops the machete, 00:40:21.840 --> 00:40:23.080 chopping a cucumber 00:40:23.120 --> 00:40:26.080 that releases the food for my starving best friend. 00:40:26.120 --> 00:40:27.480 But they'll only get this far 00:40:27.520 --> 00:40:30.600 if their garden and hallway machines work. 00:40:30.640 --> 00:40:32.560 In your own time, when you're ready, Aviators, 00:40:32.600 --> 00:40:34.680 start your entire machine. 00:40:34.720 --> 00:40:36.840 On you go, Steve. All systems green. 00:40:36.880 --> 00:40:38.560 On you go. Chocks away! 00:40:50.080 --> 00:40:52.280 The ball run is going well, 00:40:52.320 --> 00:40:55.120 but it needs to successfully trigger the broom. 00:40:57.760 --> 00:40:58.960 And that's it! 00:41:01.640 --> 00:41:04.400 Little bit more dramatic. Well done. 00:41:04.440 --> 00:41:07.080 More drama. The books have worked, too. 00:41:07.120 --> 00:41:09.680 Oh, I do love the globe roll. 00:41:14.000 --> 00:41:15.760 And now the tiny toy car 00:41:15.800 --> 00:41:17.360 needs to start the plane. 00:41:18.600 --> 00:41:20.440 Yes! That's my favourite bit. 00:41:22.320 --> 00:41:24.320 Is the monkey not behaving? 00:41:24.360 --> 00:41:26.440 Oh, no! 00:41:26.480 --> 00:41:27.840 It went. It's going. 00:41:27.880 --> 00:41:30.600 The yellow car has triggered the tea urn, 00:41:30.640 --> 00:41:34.120 which should fill the tin and tip the seesaw. 00:41:34.160 --> 00:41:35.560 It's filling. 00:41:35.600 --> 00:41:39.040 Has this stalled? No, no. It's a bit slower than anticipated. 00:41:39.080 --> 00:41:42.200 Think I'm hallucinating, but it might be going. 00:41:42.240 --> 00:41:45.040 Right. Oh, it's going. 00:41:45.080 --> 00:41:46.560 The mixer switched on, 00:41:46.600 --> 00:41:49.520 winding the string to release the cucumber machete. 00:41:49.560 --> 00:41:52.280 That's winding. Might actually work. 00:41:56.120 --> 00:42:00.160 It worked! You've done it! That's it, guys! Well done! 00:42:01.440 --> 00:42:03.600 High five. High five. That's amazing. 00:42:03.640 --> 00:42:06.720 Clear run... Wow. ..beginning to end, all three rooms. 00:42:06.760 --> 00:42:08.800 What a spectacle! 00:42:08.840 --> 00:42:11.720 The plane demonstrated Newton's second law, 00:42:11.760 --> 00:42:14.840 the dropping dog lead switched on the mixer, 00:42:14.880 --> 00:42:17.200 and after a terrifying cucumber chop, 00:42:17.240 --> 00:42:19.240 the dog food was delivered. 00:42:19.280 --> 00:42:23.600 The pressure is on the Wild Cards to match their rivals' perfect run. 00:42:23.640 --> 00:42:25.368 Wild Cards, you came here 00:42:25.392 --> 00:42:27.120 promising chaos and mess... Yeah. 00:42:27.160 --> 00:42:29.640 ..and you've delivered on that. Absolutely. 00:42:29.680 --> 00:42:32.320 They'll be desperate for their kitchen scales 00:42:32.360 --> 00:42:34.480 to knock an apple and pop a balloon, 00:42:34.520 --> 00:42:37.440 releasing a tablecloth that spins a spoon, 00:42:37.480 --> 00:42:40.280 releasing a skateboard towards a dog basket 00:42:40.320 --> 00:42:42.560 that drops the dog lead onto a fan, 00:42:42.600 --> 00:42:45.080 opening a cupboard that sends an office chair 00:42:45.120 --> 00:42:48.120 to deliver the dog food. Easy! 00:42:48.160 --> 00:42:51.200 There are some risky transitions in here, 00:42:51.240 --> 00:42:52.800 some things that can go wrong. 00:42:52.840 --> 00:42:54.268 Yes. There's actually quite a lot 00:42:54.292 --> 00:42:56.080 that can go wrong in here. Yeah. 00:42:56.120 --> 00:42:58.440 "Risky Transition" is, like, our middle name. Yeah. 00:42:58.480 --> 00:43:01.440 In your own time, when you're ready, start your machine in its entirety. 00:43:01.480 --> 00:43:04.040 Start the machine. HE YAWNS 00:43:04.080 --> 00:43:05.640 What a nice way to start it. 00:43:08.160 --> 00:43:09.840 The boat has fallen 00:43:09.880 --> 00:43:12.280 and the remote-control car triggered the ball run. 00:43:12.320 --> 00:43:13.720 So far, so good. 00:43:17.600 --> 00:43:19.920 Now the dominoes of increasing mass. 00:43:22.080 --> 00:43:23.480 Yes. 00:43:23.520 --> 00:43:25.720 Fingers crossed for the dodgy bookcase. 00:43:27.320 --> 00:43:28.600 Ooh, yes! 00:43:32.320 --> 00:43:35.760 The scales haven't caused the spatula to pop the balloon... 00:43:35.800 --> 00:43:36.920 Have you stalled? 00:43:36.960 --> 00:43:38.960 ..so they need the first of three interventions 00:43:39.000 --> 00:43:40.280 they're allowed to make. 00:43:40.320 --> 00:43:44.000 Shola, it didn't pop the apple onto the spatula to pop the balloon. 00:43:45.880 --> 00:43:48.440 They can still win this. 00:43:48.480 --> 00:43:49.760 Oh, that's so cool. 00:43:56.080 --> 00:43:58.680 HE GROANS But this is bad news. 00:43:59.960 --> 00:44:02.720 The dog lead hasn't set the fan to oscillate. 00:44:02.760 --> 00:44:04.600 Shola, you can have a second intervention. 00:44:04.640 --> 00:44:06.360 It's OK. You're still in the competition. 00:44:06.400 --> 00:44:07.760 You can win with intervention. 00:44:07.800 --> 00:44:10.240 Fingers crossed this last bit works. Just pull it. 00:44:15.680 --> 00:44:17.200 Oh, heartbreaking stuff! 00:44:17.240 --> 00:44:19.520 The cupboard door hasn't released the office chair. 00:44:19.560 --> 00:44:21.000 Has that come unstuck? 00:44:21.040 --> 00:44:23.520 Shola, you can have a third intervention. It's OK. You can... 00:44:25.520 --> 00:44:27.400 APPLAUSE You got there. You did get there. 00:44:29.200 --> 00:44:31.880 The first two rooms worked brilliantly, 00:44:31.920 --> 00:44:34.120 then the kitchen let them down, 00:44:34.160 --> 00:44:38.120 but Zach considers far more than interventions when picking a winner. 00:44:39.480 --> 00:44:42.800 One clear run and one with three interventions. 00:44:42.840 --> 00:44:46.240 Is that it? No, absolutely not. 00:44:46.280 --> 00:44:49.560 I would take a machine that had a good amount of risk 00:44:49.600 --> 00:44:51.440 over something that is just very simple 00:44:51.480 --> 00:44:53.120 and works perfectly any day. 00:44:53.160 --> 00:44:54.880 It's also been number of transitions, 00:44:54.920 --> 00:44:56.520 how many different things are in it. 00:44:56.560 --> 00:44:58.560 Is there a difference? There is a difference. 00:44:58.600 --> 00:45:04.000 The Aviators ended with 44 steps and the Wild Cards ended up with 50. 00:45:04.040 --> 00:45:06.640 So, it is going to be a tough decision, 00:45:06.680 --> 00:45:09.240 and it's yours to make. 00:45:12.520 --> 00:45:15.440 Teams, first of all, thank you both 00:45:15.480 --> 00:45:18.760 for giving us the chance to enjoy two great machines, 00:45:18.800 --> 00:45:20.760 and they were, and both very different. 00:45:20.800 --> 00:45:22.680 Absolutely. Fantastic job. 00:45:22.720 --> 00:45:24.040 The Aviators - 00:45:24.080 --> 00:45:27.520 wonderfully engineered machine, a little on the simple side. 00:45:27.560 --> 00:45:31.080 The Wild Cards - I loved the risks, I loved the big steps, 00:45:31.120 --> 00:45:32.840 not as reliable as it should have been. 00:45:32.880 --> 00:45:35.480 But there has to be a winning team, 00:45:35.520 --> 00:45:38.960 and after taking everything into consideration, 00:45:39.000 --> 00:45:40.800 the winning team is... 00:45:44.400 --> 00:45:47.240 ..the Aviators. Lads, well done. Well done to both teams. 00:45:47.280 --> 00:45:49.160 I mean, really... APPLAUSE 00:45:49.200 --> 00:45:50.760 Thank you. Cheers, guys. 00:45:52.360 --> 00:45:54.080 I'm glad we won. Aren't you? Oh, yeah. 00:45:54.120 --> 00:45:56.040 Really glad we beat them. They did a great run. 00:45:56.080 --> 00:45:58.400 Things broke that never broke all day. 00:45:58.440 --> 00:46:01.200 I feel great. I think we've outdone ourselves. 00:46:01.240 --> 00:46:04.200 We had more style. I think the word is flair. 00:46:04.240 --> 00:46:07.120 Oh, yeah, yeah. There you go - a little more flair, yeah. 00:46:07.160 --> 00:46:09.200 They're great guys cos the creativity... 00:46:09.240 --> 00:46:12.520 We came in with a plan, but a lot of their stuff, 00:46:12.560 --> 00:46:14.560 they just made up, you know, on the fly, 00:46:14.600 --> 00:46:16.640 and they came up with some fantastic stuff. 00:46:16.680 --> 00:46:18.600 Maybe we'll change our strategy next time. 00:46:18.640 --> 00:46:20.760 Something a bit different. Give it a go. Give it a try. 00:46:20.800 --> 00:46:22.800 You never know what you're capable of achieving. 00:46:22.840 --> 00:46:26.040 Next time, brothers versus students... 00:46:26.080 --> 00:46:28.360 He's making a racket. ..who have to dig deep... 00:46:28.400 --> 00:46:31.168 The duck didn't go. ..to water 00:46:31.192 --> 00:46:32.360 my plants. That didn't work.