0:00:33 > 0:00:36Hello! Hello, welcome to my Blast Lab.
0:00:36 > 0:00:39This is where I conduct my scientific experiments,
0:00:39 > 0:00:41and this is a Lab Rat.
0:00:41 > 0:00:45When I said bring your flatmate to work day, I didn't mean...
0:00:45 > 0:00:48Go away, and take your friend with you. Leave. Thank you.
0:00:48 > 0:00:53Now, you could compare my Lab to Willy Wonka's Chocolate Factory.
0:00:53 > 0:00:57Except when our visitors get injured, we don't sing songs,
0:00:57 > 0:00:59we just hide it and pretend we didn't notice.
0:00:59 > 0:01:02Right, today's visitors are two teams of young scientists
0:01:02 > 0:01:05who will compete in a series of scientific challenges
0:01:05 > 0:01:07to win a host of exciting prizes.
0:01:07 > 0:01:10And hopefully not get injured at all. That goes for all of us.
0:01:10 > 0:01:13Hopefully, we'll all end the experience as we began it.
0:01:13 > 0:01:16Coming up today, we have Fact Nav 2.0 with my good friend, Oliver.
0:01:21 > 0:01:23In Mini Science, we'll be looking for a big reaction
0:01:23 > 0:01:25from some chemical reactions.
0:01:31 > 0:01:35Meanwhile, my Lab Rats will be playing with washing up liquid
0:01:35 > 0:01:40and one of the most flammable gases in the universe.
0:01:40 > 0:01:43And talking of mess, we return to the natural habitat
0:01:43 > 0:01:46of the most disgusting mess in the known universe.
0:01:46 > 0:01:49- It is the septic tank. - CHEERING
0:01:51 > 0:01:53Now, to keep all my experiments safe,
0:01:53 > 0:01:57I employ the world's toughest and oldest security guard.
0:01:57 > 0:01:59- It's my Ninja Nan. - CHEERING
0:02:06 > 0:02:08And she has recently taken up gardening.
0:02:08 > 0:02:11So let's see what she's growing.
0:02:11 > 0:02:14Oh, she's growing a pair of nunchucks. That's nice.
0:02:14 > 0:02:17Hopefully, she'll win the ninja vegetable contest this year,
0:02:17 > 0:02:20cos last year, there was trouble when she came second.
0:02:20 > 0:02:23Let's see who's trying to get into my Lab today.
0:02:23 > 0:02:26CHEERING
0:02:28 > 0:02:31Well, that's very generous of you, but we don't know who they are,
0:02:31 > 0:02:34they could be anybody. They're claiming to be the red team.
0:02:34 > 0:02:37Well, I have here your file. Names, please?
0:02:37 > 0:02:40- Finlay.- Joe.- Lemmy. - Finlay, Joe, Lemmy, yeah,
0:02:40 > 0:02:44that checks out. Hidden talent. Joe, I've got your name written down.
0:02:44 > 0:02:47- What will you do? - Perform a magic trick.
0:02:47 > 0:02:49- All right, go on then.- Two kings
0:02:49 > 0:02:51- sandwiched between two cards.- Yes.
0:02:51 > 0:02:55I'm going to flick my fingers over the cards and they're two red kings.
0:02:55 > 0:02:56No, fair enough, fair enough!
0:02:56 > 0:02:59I wouldn't launch a career on the basis of it,
0:02:59 > 0:03:00but that was a magic trick.
0:03:00 > 0:03:02Come into the studio, please, red team.
0:03:05 > 0:03:08Welcome to the Lab, guys, nice to see you.
0:03:08 > 0:03:11You're nearly through security. Sorry about being so careful.
0:03:11 > 0:03:15But we can't let anybody in, a lot of secret stuff in here.
0:03:15 > 0:03:18A password has been agreed with the authentic red team
0:03:18 > 0:03:20which, if you are the red team, you should know.
0:03:20 > 0:03:24- What is it? I'll see if it's what I've got written here.- ALL: Hammy.
0:03:24 > 0:03:26Ha-ha! Why, out of interest?
0:03:26 > 0:03:31- It's the name of Joe's hamster. - Genius! You might be scientific,
0:03:31 > 0:03:35but your imagination is speeding up to catch.
0:03:35 > 0:03:38Anyway, well done, you are the red team. Give them a round of applause.
0:03:38 > 0:03:42Go and get settled in ready for the first game.
0:03:42 > 0:03:46Now, let's have a look at the second team trying to get into my Lab.
0:03:46 > 0:03:49CHEERING
0:03:52 > 0:03:56You claim to be the yellow team. For security reasons, we have to
0:03:56 > 0:04:00- make sure. First, your names?- I'm Connie.- I'm Lauren.- And I'm Cleo.
0:04:00 > 0:04:04Connie, Lauren and Cleo. Yeah, that's what I've got written down.
0:04:04 > 0:04:06OK, and your hidden talent?
0:04:06 > 0:04:10My special talent is I can do a three-leaf clover with my tongue.
0:04:10 > 0:04:12Really? Go on then.
0:04:12 > 0:04:14Yeah, kind of. Yeah, that'll do.
0:04:14 > 0:04:16You are the yellow team. Come into the Lab, please.
0:04:23 > 0:04:26Hello, so-called yellow team, still can't be quite sure, obviously.
0:04:26 > 0:04:29A password has been agreed with the yellow team. What is it?
0:04:29 > 0:04:31ALL: Bananas.
0:04:31 > 0:04:34Yeah, that's what I've got written on the file. Why?
0:04:35 > 0:04:38- Because our name was Cheeky Chimps. - Oh, your team name.
0:04:38 > 0:04:41You're the yellow team and that's that, but well done for trying.
0:04:41 > 0:04:43Right, go and get settled in.
0:04:45 > 0:04:48Because now it's time for the car who can't always get from A to B,
0:04:48 > 0:04:52but he does know that E=MC2. It is Oliver.
0:05:09 > 0:05:14I've installed the latest version of Fact Nav, Fact Nav 2.0, into Oliver.
0:05:14 > 0:05:16It's crammed with even more facts.
0:05:16 > 0:05:19It's not perfect, though, because I fitted it,
0:05:19 > 0:05:23so there are a few bugs in the new software, which mean you teams
0:05:23 > 0:05:26have to work out whether these facts are true or false.
0:05:26 > 0:05:29If it's true, Oliver will make this noise.
0:05:29 > 0:05:31BEEPING
0:05:32 > 0:05:36But if a fact is false, Oliver will make this noise.
0:05:36 > 0:05:38HONKING
0:05:38 > 0:05:42Now, yellow, red teams, as you can see, you both have three red lights.
0:05:42 > 0:05:44Each time you answer a question correctly,
0:05:44 > 0:05:48Oliver will turn one of them green. But if you get a question wrong,
0:05:48 > 0:05:52Oliver will turn one of the other team's lights green. OK?
0:05:52 > 0:05:56The first team to turn all three lights green will win the round.
0:05:56 > 0:06:00But to find out who goes first and gets their first green light,
0:06:00 > 0:06:03we have a "nearest to" question to start.
0:06:03 > 0:06:07So, this question is for both teams. I want an answer from both teams,
0:06:07 > 0:06:11the light will be lit by the team that gets closest. OK? Here it is.
0:06:11 > 0:06:15If you were to lay flat the outer layer of the human brain,
0:06:15 > 0:06:18what sized area would it cover?
0:06:18 > 0:06:21And I'd like the answer in square centimetres, OK?
0:06:21 > 0:06:23If you lay flat the outer layer of the human brain,
0:06:23 > 0:06:26what area would it cover? Reds, what do you think?
0:06:26 > 0:06:29- 25.- 25 squared centimetres. Yellow team?
0:06:29 > 0:06:32We've put 54 centimetres square.
0:06:32 > 0:06:36Well the real answer is 2,500 squared centimetres.
0:06:36 > 0:06:39You got that quite wrong, but that means the yellow team are nearest,
0:06:39 > 0:06:41so that's a green light for you.
0:06:42 > 0:06:45OK, right. This, then, is the first question.
0:06:45 > 0:06:47You've lit your first green light, yellows.
0:06:47 > 0:06:52Pluto was named by an 11-year-old girl.
0:06:52 > 0:06:54Pluto was named by an 11-year-old girl.
0:06:54 > 0:06:57- We think false.- She thinks false. Oliver, is it true or false?
0:06:57 > 0:07:01Sorry, it is in fact true, unbelievably.
0:07:01 > 0:07:04So that means a green light lit for the red team.
0:07:04 > 0:07:06Venetia Burney came up with the name,
0:07:06 > 0:07:09and it was related to the god of the underworld. Right,
0:07:09 > 0:07:10a true or false for the reds.
0:07:10 > 0:07:15Helium is the lightest gas. Helium is the lightest gas.
0:07:15 > 0:07:18- Is that true or false?- False. - You think false.
0:07:18 > 0:07:21- Oliver, is it true or false? - HONKING
0:07:21 > 0:07:26False, well done! That puts you with two lights lit green, you're ahead.
0:07:26 > 0:07:28Hydrogen is the lightest gas known to man.
0:07:28 > 0:07:31Right, the next true or false goes to you, yellows.
0:07:31 > 0:07:34This is your chance to really stay in the game, OK?
0:07:34 > 0:07:38A person can shed 18 kilograms of skin over a lifetime.
0:07:38 > 0:07:40Is that true or false?
0:07:40 > 0:07:42- True.- You're all in agreement?
0:07:42 > 0:07:45Oliver, do let us know, please. Is it true or false?
0:07:45 > 0:07:48- BEEPING - It's true, well done!
0:07:48 > 0:07:51Well done, that means two green lights for each team.
0:07:51 > 0:07:56Right, this is your next true or false statement, red team, OK?
0:07:56 > 0:07:59Thunder is caused when lightning hits the ground
0:07:59 > 0:08:02and makes the earth vibrate.
0:08:02 > 0:08:06Is that true or false? Really important you get this right.
0:08:06 > 0:08:09Thunder is caused when lightning hits the ground
0:08:09 > 0:08:12- and makes the earth vibrate. Is that true or false?- False.
0:08:12 > 0:08:14You think false. Pretty confident.
0:08:14 > 0:08:17- Yeah.- Quite confident. - Really confident?- Yeah.
0:08:17 > 0:08:20- You getting more or less confident every time I ask?- More.
0:08:20 > 0:08:23- Really?- Very more.- Really?- Yeah. - Really?- Yeah!
0:08:23 > 0:08:25- OK, Oliver, is it true or false? - BEEPING
0:08:25 > 0:08:29Well done! Reds take that point, that means three green lights
0:08:29 > 0:08:32are lit and they win the game. Well done.
0:08:34 > 0:08:37So that means the score after the first round,
0:08:37 > 0:08:39it is one point ahead to the reds.
0:08:54 > 0:08:58Now, science never was my best subject at school,
0:08:58 > 0:09:01so to help out here in the Lab I wanted to bring back
0:09:01 > 0:09:04my old teacher using a time machine. But, like I said,
0:09:04 > 0:09:07science never was my best subject at school,
0:09:07 > 0:09:10so the time machine I built didn't quite work as planned.
0:09:10 > 0:09:13My old teacher's here, but now, she looks like a ten-year-old girl.
0:09:13 > 0:09:17- She is of course Mini Miss. - CHEERING
0:09:22 > 0:09:26- Hello, Miss.- What did I say about messing round with time machines?
0:09:26 > 0:09:30- Dunno, Miss, I wasn't listening. - Well, start listening now.
0:09:30 > 0:09:34Today's game is all about explosive reactions.
0:09:35 > 0:09:38I hope you're not going to make a mess of my Lab, Miss.
0:09:38 > 0:09:41Richard, this hovel already looks as if a whirlwind hit it.
0:09:41 > 0:09:44- I doubt I can make it worse. - It's character.
0:09:44 > 0:09:47Now, concentrate. Today's game is called...
0:09:49 > 0:09:51How do you do that, Miss? OK.
0:09:51 > 0:09:54In front of the teams are six liquids and six substances.
0:09:54 > 0:09:59They must take it in turns to choose one of each and mix them together.
0:09:59 > 0:10:02- What? Mix this bit into that bit?- Yes.
0:10:02 > 0:10:04OK. So that's what you're going to demonstrate, Miss?
0:10:04 > 0:10:07- Yes.- Miss, why are you putting on protective things?
0:10:07 > 0:10:11Because it's probably going to give us a reaction.
0:10:11 > 0:10:12OK.
0:10:12 > 0:10:18OK. Yeah, OK, something's happening. Miss, is this going to take over
0:10:18 > 0:10:21the Lab and chase us around the corridors, or is that it?
0:10:21 > 0:10:25OK, it ends there. That does sound pretty easy really so far.
0:10:25 > 0:10:27They just add that to that.
0:10:27 > 0:10:31But if they choose the wrong combination, nothing will happen.
0:10:31 > 0:10:34- Right.- If they choose the correct combination,
0:10:34 > 0:10:36they'll have a reaction like that,
0:10:36 > 0:10:39- and they'll be closer to winning the game.- So they take it in turns
0:10:39 > 0:10:42mixing one of these of their choice with one of those
0:10:42 > 0:10:46- until somebody gets lucky, then we clean up?- Right.- Sounds fair.
0:10:46 > 0:10:49- The team with the most reactions wins the round?- That's right.
0:10:49 > 0:10:52OK, before you get started, you need to have a look at your options
0:10:52 > 0:10:54and see what you've got to choose from.
0:10:54 > 0:10:58Here we have a mystery liquid which can be dangerous, this stuff,
0:10:58 > 0:11:00but it's OK, we've got it in quite a dilute form,
0:11:00 > 0:11:03so you're all going to be perfectly safe. Trust me.
0:11:03 > 0:11:07We've patched up all the holes in the wall from the last time.
0:11:07 > 0:11:10Over here, we have some household substances as well,
0:11:10 > 0:11:12which I'll let Mini Miss talk you through.
0:11:12 > 0:11:16So take advantage of this. She'll tell you all you need to know.
0:11:20 > 0:11:23All the mystery liquids are actually the same.
0:11:23 > 0:11:26They're hydrogen peroxide mixed with a little bit of washing up liquid,
0:11:26 > 0:11:29but let's not tell the teams that.
0:11:29 > 0:11:31Hydrogen peroxide is made up of hydrogen and oxygen,
0:11:31 > 0:11:34and it breaks down to make water and oxygen,
0:11:34 > 0:11:36that's just what it does all the time. Usually,
0:11:36 > 0:11:39it can break down by itself, but it's slow.
0:11:39 > 0:11:42What the teams are doing here is speeding it up.
0:11:42 > 0:11:46Out of these substances, only some will speed up the reaction.
0:11:46 > 0:11:50When hydrogen peroxide is broken down quickly,
0:11:50 > 0:11:52it means lots of oxygen is made fast.
0:11:52 > 0:11:55This oxygen is then trapped in the washing up liquid,
0:11:55 > 0:11:56the other ingredient in there,
0:11:56 > 0:11:59and that's what makes a big bubbly mess, OK?
0:11:59 > 0:12:02Right, the red team won the first round, which means,
0:12:02 > 0:12:05in time-honoured Blast Lab fashion, you get to choose
0:12:05 > 0:12:10- whether you go first or second here. What do you want to do?- First.
0:12:10 > 0:12:12- You want to go first?- Yeah.
0:12:12 > 0:12:14Yellows, this is an opportunity for you to learn.
0:12:14 > 0:12:17Something may happen. We may all need our glasses or not.
0:12:17 > 0:12:19Right, if you'd like to get behind the counter.
0:12:22 > 0:12:24Have you come to your decisions?
0:12:24 > 0:12:28- Yeah.- Really?- We'll use bicarbonate of soda.
0:12:28 > 0:12:31They're confident, the red team. Their decisions are made.
0:12:31 > 0:12:33- So bicarbonate of soda and...? - And the red.- Right.
0:12:33 > 0:12:37- Blue!- Green!
0:12:37 > 0:12:42- You stick to your own decisions, team. What do you reckon?- Blue!
0:12:42 > 0:12:45Everybody's an expert. OK, this is the moment.
0:12:45 > 0:12:48If we'd like to get them on the experimental table over here.
0:12:48 > 0:12:50Here we go, begin pouring.
0:12:50 > 0:12:55There might be something massive created by this - or not.
0:12:55 > 0:12:57Here it goes. Oh, no!
0:12:57 > 0:12:59It's...terrifyingly flat.
0:13:01 > 0:13:02AUDIENCE: Aw!
0:13:02 > 0:13:05Yeah, sorry, reds, that's a damp squib for the red team.
0:13:05 > 0:13:08If you come out, let's have the yellow team in for their turn.
0:13:11 > 0:13:14- Right, have you decided? - Yeah, these.
0:13:14 > 0:13:17This yellowy one here. OK, and you've gone for cola.
0:13:17 > 0:13:19All right, if you'd like to take it over there.
0:13:19 > 0:13:22OK, are we ready? Everybody? Let's focus in case we all -
0:13:22 > 0:13:26there's no other way of putting this - need to run away quickly.
0:13:26 > 0:13:30Right, begin. Pouring, pouring, pouring.
0:13:30 > 0:13:34Oh, no, maybe it's a slow developer, maybe...!
0:13:34 > 0:13:37It's not a slow developer, is it? Nothing's happened. Sorry, yellows.
0:13:37 > 0:13:39Step back. Reds, step forward and take over.
0:13:42 > 0:13:44Reds, tell me what you've gone for, please.
0:13:44 > 0:13:49- We've gone for this yeast and green stuff.- Why?
0:13:49 > 0:13:52- I like the colour.- Well, this is experimentation. We don't know.
0:13:52 > 0:13:56You don't know what some of these are, you find out by experimenting.
0:13:56 > 0:14:00Right, if we are ready, begin pouring for us, please.
0:14:01 > 0:14:05Oh, hello... Oh! Oh, well done!
0:14:08 > 0:14:11Yeast contains an enzyme called catalase,
0:14:11 > 0:14:14and this makes the hydrogen peroxide break down really fast,
0:14:14 > 0:14:16making the bubbly mess.
0:14:16 > 0:14:17All right, that's one for the red team.
0:14:20 > 0:14:23Yellows, what are we going for?
0:14:23 > 0:14:25We're going for blue and that.
0:14:25 > 0:14:29It's burger. It's burger is what that is.
0:14:29 > 0:14:32OK, right, if you'd like to step over to the table. That's better.
0:14:32 > 0:14:34OK, if we're ready, then.
0:14:34 > 0:14:36OK, here we go. Let's watch.
0:14:37 > 0:14:39Keep going, you want to get the burger in.
0:14:39 > 0:14:42Eugh. Oh, that's nice.
0:14:42 > 0:14:46Do you know, I'm not hungry all of a sudden!
0:14:46 > 0:14:51Nothing's happened. OK, burger and blue
0:14:51 > 0:14:54doesn't work. Reds, you're one ahead.
0:14:57 > 0:15:00- What are you going for? - Chicken and the green.
0:15:00 > 0:15:04- Chicken liver and the green. - Look, it's an ice pop.
0:15:04 > 0:15:07OK, let's... Oh, you go for it, no, you go for it.
0:15:07 > 0:15:08Reds go for it, here we go.
0:15:08 > 0:15:10In it goes. Oh!
0:15:13 > 0:15:17Just like yeast, chicken liver has a lot of catalase in it,
0:15:17 > 0:15:20so it breaks down the hydrogen peroxide super-fast, too.
0:15:20 > 0:15:23If anybody's hungry? Well done, reds. Step back.
0:15:23 > 0:15:26A round of applause, I think, for reds, cos they've now got two.
0:15:26 > 0:15:29In actual fact, that means the reds win,
0:15:29 > 0:15:33and that means we're two points ahead for the red team.
0:15:36 > 0:15:40Yeah, Lab Rats, if you'd like to clear all of that mess up, please.
0:15:40 > 0:15:41This gives me an idea.
0:15:44 > 0:15:48Bubbles. We use them every day, and they're great.
0:15:48 > 0:15:50From washing the car to doing the dishes.
0:15:53 > 0:15:56Ah, you're a cheeky thing, aren't you? Everyone loves bubbles.
0:15:56 > 0:16:02No, you're not supposed to be in the shower with your clothes on, silly!
0:16:02 > 0:16:04But what happens when an everyday friend
0:16:04 > 0:16:08becomes a life-threatening foe?
0:16:13 > 0:16:16When filled with flammable gases such as hydrogen,
0:16:16 > 0:16:22they become combustible and no-one is safe. Yeah, don't worry,
0:16:22 > 0:16:25these lab rats aren't covered in kilo-bubbles of hydrogen,
0:16:25 > 0:16:29just in washing up liquid. They'll be fine, annoyingly.
0:16:32 > 0:16:34No-one can escape the bubbles.
0:16:36 > 0:16:38There must be someone who can stand up to
0:16:38 > 0:16:42these squeaky-clean killers, these bubbles of terror.
0:16:42 > 0:16:43We need an expert.
0:16:43 > 0:16:46Hello. I'm a bubble expert.
0:16:48 > 0:16:53This man says he can harness the raw power of hydrogen-filled bubbles.
0:16:53 > 0:16:57And today, in a scientific first, and quite possibly last,
0:16:57 > 0:17:01he'll attempt to wield his gauges, dials and gizmos to create
0:17:01 > 0:17:07the tallest hydrogen bubble tower the world has ever seen. Ever.
0:17:08 > 0:17:10But how does it work?
0:17:10 > 0:17:14Hydrogen is the lightest gas that science knows.
0:17:14 > 0:17:16In fact, it's about 14 times lighter than air,
0:17:16 > 0:17:21which means it can float up through, well, air.
0:17:21 > 0:17:24Here, as the hydrogen is pumped through soapy water,
0:17:24 > 0:17:27bubbles are made with hydrogen inside.
0:17:27 > 0:17:29These, too, can float up through the air.
0:17:29 > 0:17:32But to create a bubble tower, the bubbles must cling to each other
0:17:32 > 0:17:36just enough to stop them floating up, up and away.
0:17:36 > 0:17:39So, will our tower stand tall, or will we be left with
0:17:39 > 0:17:44a stout, sticky mess of bubble trouble?
0:17:44 > 0:17:46In a similar way to how people measure horses with hands,
0:17:46 > 0:17:50we'll use the ye olde English
0:17:50 > 0:17:52scientific measurement of lab rats
0:17:52 > 0:17:57to see how high our tower grows. So, with all our hugely complicated
0:17:57 > 0:18:01and ridiculously expensive scientific equipment in place,
0:18:01 > 0:18:07we are ready for the world's first in science, a tower of bubbles.
0:18:09 > 0:18:15Here we go. It's rising, but how many lab rats high will it grow?
0:18:15 > 0:18:17Hold the experiment right there,
0:18:17 > 0:18:20because there's another point at stake here.
0:18:20 > 0:18:24I'll ask a question. A point goes to the team that
0:18:24 > 0:18:27gets it right or is nearest to the correct answer. Now,
0:18:27 > 0:18:31there is the issue of the score - reds on two, yellows on zero.
0:18:31 > 0:18:35That means, yellows, you can't equalise if you get this right,
0:18:35 > 0:18:39but think of the honour and the glory of winning that...
0:18:39 > 0:18:41Yes, you want to win the point.
0:18:41 > 0:18:43Reds, you can just gloat a few minutes, so that's OK.
0:18:43 > 0:18:46Right, the question is this. How many Lab Rats high
0:18:46 > 0:18:48do you think that tower goes?
0:18:48 > 0:18:50- One and a half. - One and a half.
0:18:50 > 0:18:52- Two and a half.- Oh! - Two and a half.
0:18:52 > 0:18:55Well, you've said it now... Two and a half for the yellows.
0:18:55 > 0:18:57Let's see the remainder of the experiment.
0:18:57 > 0:19:01It began with a simple question...
0:19:10 > 0:19:13Well, that's not a simple question.
0:19:13 > 0:19:16But with the help of our bubble expert, let's find out.
0:19:16 > 0:19:20OK, so the bubbles are starting to rise out of the machine.
0:19:20 > 0:19:23We are knee-high at this point.
0:19:23 > 0:19:25Starting to really gain some vertical height now.
0:19:25 > 0:19:29We're at half a lab rat and rising.
0:19:29 > 0:19:31One lab rat. I can't believe it.
0:19:31 > 0:19:35It's showing no signs of stopping.
0:19:35 > 0:19:39One and a half lab rats. Can it go any higher?
0:19:41 > 0:19:44One and three quarter lab rats high.
0:19:44 > 0:19:45This must be a world record.
0:19:47 > 0:19:49Oh, but it's buckling and warping.
0:19:49 > 0:19:53I don't think it can grow higher. The sheer height of the tower
0:19:53 > 0:19:55is too much for the lift of the hydrogen gas
0:19:55 > 0:19:57to keep it up straight.
0:19:57 > 0:19:59At one and three quarter lab rats high,
0:19:59 > 0:20:03the fairy tower's meteoric rise to the ceiling is over.
0:20:03 > 0:20:06So, there we have it. How many lab rats high
0:20:06 > 0:20:10can a hydrogen tower of bubbles grow? One and three quarters.
0:20:10 > 0:20:13So that can only mean, with one and a half guess for you,
0:20:13 > 0:20:19the point goes to the red team. So, the score now, yellows,
0:20:19 > 0:20:22is three to them, none to the yellows. But all that's done
0:20:22 > 0:20:26is buy them a five-second advantage in the messy mess test.
0:20:26 > 0:20:29You could still win the day. Right, go and get changed
0:20:29 > 0:20:30into your protective suits,
0:20:30 > 0:20:34because that's what we are doing next, the Messy Messy Mess Test.
0:20:34 > 0:20:36CHEERING
0:20:36 > 0:20:39Boy, will you need those suits! While they're getting changed,
0:20:39 > 0:20:42I made a mistake after that last experiment.
0:20:42 > 0:20:45I left the Lab Rats to their own devices.
0:20:45 > 0:20:48Inevitably... well, there was an explosion.
0:20:50 > 0:20:53How do we get rid of a tower of flammable hydrogen bubbles?
0:20:53 > 0:20:58Well, this is Blast Lab so, of course, always set fire to it.
0:20:58 > 0:20:59Five.
0:21:01 > 0:21:02Four.
0:21:04 > 0:21:05Three.
0:21:05 > 0:21:08Two.
0:21:08 > 0:21:10One... Ignite!
0:21:11 > 0:21:14Oh, that wasn't very exciting, really, was it?
0:21:14 > 0:21:17Especially after all that build-up. I feel a bit silly.
0:21:17 > 0:21:21Let's go back to the studio and let's just not talk about it again.
0:21:24 > 0:21:25Don't applaud, it was pitiful.
0:21:25 > 0:21:29Which one of you was responsible for that pathetic explosion?
0:21:29 > 0:21:32Come on, which one? Step forward. Which one?
0:21:32 > 0:21:34Yeah!
0:21:34 > 0:21:37Listen, you know only decent, full-sized explosions
0:21:37 > 0:21:39are allowed in the Blast Lab. That was rubbish.
0:21:39 > 0:21:42So for your punishment, I'd like you to go and stir
0:21:42 > 0:21:45the septic tank thoroughly with that.
0:21:45 > 0:21:48Every bit of it, don't miss any, OK? I want it all stirred up.
0:21:48 > 0:21:52Right, talking of the septic tank, it is now time for...
0:21:52 > 0:21:55ALL: The Messy Messy Mess Test!
0:21:55 > 0:22:00Ah, the stuff in here. I know, no bare skin, it'll melt.
0:22:00 > 0:22:04We wanted to find out whether or not it is safe for human beings,
0:22:04 > 0:22:06and we sent it off to a special lab.
0:22:06 > 0:22:09Sadly, though, it melted its way through the envelope on the way.
0:22:09 > 0:22:11And through the van.
0:22:11 > 0:22:13And the road underneath.
0:22:13 > 0:22:16Anyway, let's get on with the game. Try not to breathe it in.
0:22:16 > 0:22:19You have some time to get as many of the prize disks as you can
0:22:19 > 0:22:23and put them in your baskets. Today's prizes include an internal
0:22:23 > 0:22:26combustion engine, a chemistry set and a radio-controlled spider,
0:22:26 > 0:22:30but be careful, because amongst those disks you will find these,
0:22:30 > 0:22:32red and yellow herrings.
0:22:32 > 0:22:35If one of these ends up in your basket, either team,
0:22:35 > 0:22:38that team will lose one of its prize disks,
0:22:38 > 0:22:41which could be the difference between winning and losing the game.
0:22:41 > 0:22:44So be careful. Don't put any of these in. You all clear?
0:22:44 > 0:22:49- Yeah.- Now, as usual, the leading team at this stage gets a head start.
0:22:49 > 0:22:54You're ahead by three points, you get a five-second head start. OK?
0:22:54 > 0:22:58And your sum time starts, ooh...
0:22:58 > 0:23:00now!
0:23:01 > 0:23:03And away they go.
0:23:03 > 0:23:05AUDIENCE: Reds! Reds!
0:23:05 > 0:23:07Yellow team, away you go.
0:23:10 > 0:23:14And there go the yellows, with victory on their minds.
0:23:14 > 0:23:16And red goo between their toes.
0:23:16 > 0:23:18And our prize disks falling on their heads.
0:23:18 > 0:23:21Before we start... Oh, we have started, haven't we?
0:23:21 > 0:23:25I meant to warn them about the extra gunge coming out of those pipes.
0:23:25 > 0:23:28The reds had a head start. Looks like the yellows are losing theirs,
0:23:28 > 0:23:32as they've already fallen behind two to nothing.
0:23:32 > 0:23:36Ooh, there's one for the yellows, they're back in the game.
0:23:38 > 0:23:41Still trying, and another for the yellows.
0:23:41 > 0:23:45The reds losing ground, as the teams draw neck and neck with each other
0:23:45 > 0:23:48whilst up to their necks in red goo.
0:23:48 > 0:23:50It is mayhem out there,
0:23:50 > 0:23:54both teams desperate not to end up on the losing side.
0:23:56 > 0:23:59It's anyone's game now, and the prized prize disks flowing
0:23:59 > 0:24:02as thick and fast as the gunk from the pipes above.
0:24:02 > 0:24:05It's going to go right to the wire here.
0:24:05 > 0:24:09They're on borrowed sum time now, surely?
0:24:14 > 0:24:17OK!
0:24:17 > 0:24:20Hold it, hold it, hold it. Time is up.
0:24:20 > 0:24:24Now we must find out who's won. The team with the most disks
0:24:24 > 0:24:26will take those prizes home. A Lab Rat, please.
0:24:26 > 0:24:30Obviously, this stuff's lethal, I don't want to handle it.
0:24:30 > 0:24:33We need a special Lab Rat because this one can count, apparently.
0:24:33 > 0:24:37How many disks for the yellow team? Indicate with your paw... Three.
0:24:37 > 0:24:41Were there any red and yellow herrings in there?
0:24:41 > 0:24:46So that stands at three. OK. Count up the reds, please.
0:24:46 > 0:24:49So, for the red team, that is...? Seven!
0:24:49 > 0:24:52Whoa, a win for the red team, clearly!
0:24:52 > 0:24:54Congratulations.
0:24:56 > 0:24:59I think we should probably take a look at what you have won.
0:24:59 > 0:25:02These are the prizes, one of each of these for each of you, red team.
0:25:03 > 0:25:05A radio-controlled spider.
0:25:05 > 0:25:09A Tomb of Doom game.
0:25:09 > 0:25:12Internal combustion engine.
0:25:12 > 0:25:15Transforming robot.
0:25:15 > 0:25:18Lunar eclipse bedroom light.
0:25:18 > 0:25:20Chemistry set.
0:25:20 > 0:25:23And a pogo stick for each of you.
0:25:25 > 0:25:28This next bit is slightly awkward,
0:25:28 > 0:25:30and I probably shouldn't do it because it's cruel,
0:25:30 > 0:25:33but let's see, yellow team, what you would have won had you won.
0:25:33 > 0:25:37It's nice to know. You'd have each had a puzzle cube.
0:25:37 > 0:25:40You'd each have had a lunar eclipse bedroom light.
0:25:40 > 0:25:43And the Tomb of Doom game for each of you.
0:25:43 > 0:25:47All of which means right now, it's time for Bidet Goes Bang.
0:25:54 > 0:25:58Reds, well done, that is quite a haul of prizes
0:25:58 > 0:26:02you'll be taking home from the Blast Lab. Well done, they're all yours.
0:26:02 > 0:26:05This is slightly awkward now, because they're happy,
0:26:05 > 0:26:08and then on the other side, it's not quite the same.
0:26:08 > 0:26:11Yellows, you're not taking yours home with you,
0:26:11 > 0:26:14you'll blow them up. Time for Bidet Goes Bang.
0:26:14 > 0:26:17Come with me, come with me, come with me. Come on, come on.
0:26:17 > 0:26:19ALL: Ah!
0:26:19 > 0:26:23Yeah, it's quite solemn.
0:26:23 > 0:26:24Yeah.
0:26:28 > 0:26:31Yellows, I'm sorry, it's... I know, it's...
0:26:36 > 0:26:39It's sometimes moving, this moment. You're all right, though?
0:26:39 > 0:26:42- Yeah. We don't care.- Yeah, well, thank you for taking part.
0:26:42 > 0:26:46And there's no putting it off, cos what's happening now is
0:26:46 > 0:26:49you'll blow up the prizes you would have taken home. All right?
0:26:49 > 0:26:52so if you'd like to lift the plunger, please.
0:26:52 > 0:26:54Who's doing this? All together? It's the best way.
0:26:54 > 0:26:57All right, audience, if you'd like to join in...
0:26:57 > 0:27:01ALL: Five, four, three, two, one.
0:27:08 > 0:27:10I'm sorry, team. Thank you, well done anyway.
0:27:10 > 0:27:14Today, we've investigated chemical reactions and explosive gases,
0:27:14 > 0:27:18which is all in a day's work for an experimental inventor like myself,
0:27:18 > 0:27:22as is tea, toast and Sudoku, which is what I've got next! See you soon.
0:27:34 > 0:27:36Subtitles by Red Bee Media Ltd
0:27:36 > 0:27:41E-mail subtitling@bbc.co.uk