0:00:02 > 0:00:05- Are you ready for our Ouch-Snips? - Snip!- Ouch!- Exactly!
0:00:08 > 0:00:11It's time for the cough to take on the sneeze.
0:00:11 > 0:00:14- Which will win? - Let's head to the lab.
0:00:14 > 0:00:16First up, the cough.
0:00:16 > 0:00:18Time to see it like never before.
0:00:19 > 0:00:22Now, this is a video of the inside of my head.
0:00:22 > 0:00:24This was taken using a...
0:00:27 > 0:00:29Now, the main difference between a cough
0:00:29 > 0:00:33and simply breathing out hard is my favourite body part...
0:00:35 > 0:00:38Its normal job is to stop food going into your lungs
0:00:38 > 0:00:42when you swallow, but in a cough, it closes off the lungs
0:00:42 > 0:00:45and allows pressure to build up in the lungs.
0:00:45 > 0:00:47Xand, do the first part of a cough.
0:00:47 > 0:00:50Now, Xand's closed his epiglottis, the pressure's rising in his chest,
0:00:50 > 0:00:52so when he opens it...
0:00:52 > 0:00:55..the air rushes out at...
0:00:55 > 0:00:59But if a cough's that powerful, where does it go? And what's in it?
0:00:59 > 0:01:02It's time for some...
0:01:02 > 0:01:06I've put plates full of a special scientific gunk
0:01:06 > 0:01:09called agar jelly on the faces of our cut-outs.
0:01:09 > 0:01:11So if any bacteria happened to land on any of our plates,
0:01:11 > 0:01:15they're going to multiply so much we can actually see them.
0:01:15 > 0:01:18OK, Chris, are you ready? Three, two, one, cough!
0:01:19 > 0:01:21We're doing two experiments,
0:01:21 > 0:01:23one where the plates are ten centimetres away,
0:01:23 > 0:01:25and another where they're 50 centimetres away.
0:01:27 > 0:01:30- Well, all done. - Not quite, Chris.
0:01:30 > 0:01:33I want you to take this agar plate and hold it in front of your face
0:01:33 > 0:01:34and I'm going to cough on it.
0:01:34 > 0:01:37And this time I'm going to cover my mouth with my elbow,
0:01:37 > 0:01:40the way you're supposed to, and hopefully no germs
0:01:40 > 0:01:41should land on the plate.
0:01:41 > 0:01:44OK, well, just make sure you do it properly.
0:01:44 > 0:01:46HE COUGHS LOUDLY
0:01:50 > 0:01:54We've given the bacteria a few days to grow. Time for the results.
0:01:54 > 0:01:56So let's check out the cut-outs
0:01:56 > 0:01:58that were 50 centimetres away first.
0:02:01 > 0:02:02Eugh! Yuck!
0:02:02 > 0:02:05This has worked really well.
0:02:05 > 0:02:08All these bacteria have grown into thick,
0:02:08 > 0:02:11furry, yucky blooms.
0:02:11 > 0:02:12Euggh!
0:02:12 > 0:02:14Well, let's have a look at mine.
0:02:14 > 0:02:17Eeeugh! They're even worse than Xand's.
0:02:17 > 0:02:21Mine are also growing in horrible, slimy, furry, green colonies.
0:02:21 > 0:02:25Now for the cut-outs that were only ten centimetres away.
0:02:25 > 0:02:27Oh! This is even worse!
0:02:27 > 0:02:30There's loads of furry stuff in here.
0:02:30 > 0:02:32Oh, that is disgusting!
0:02:32 > 0:02:34Let's have a look at mine.
0:02:34 > 0:02:35Euugh!
0:02:35 > 0:02:38There's the huge bacterial splat in the middle of the plate.
0:02:38 > 0:02:40I must've coughed up a lot of saliva with that one.
0:02:40 > 0:02:43So this is like coughing into someone's face
0:02:43 > 0:02:44when they're right next to you.
0:02:44 > 0:02:46And that's bad news for them
0:02:46 > 0:02:50when you realise that the average cough has 20,000 viruses in it.
0:02:50 > 0:02:54Which brings me to our last result. Let's have a look at the plate
0:02:54 > 0:02:57where I covered my mouth and coughed at Chris.
0:02:57 > 0:02:59Two bacteria!
0:02:59 > 0:03:02I knew you hadn't covered your mouth properly!
0:03:02 > 0:03:07So a cough can spread illness by shooting out germs at 60mph.
0:03:10 > 0:03:12That could spread germs even further.
0:03:12 > 0:03:14Let's take a look...
0:03:14 > 0:03:17This is a slow-mo video of my sneeze.
0:03:17 > 0:03:18Here we go!
0:03:20 > 0:03:23Did you notice how it's all coming out of my mouth and not my nose?
0:03:23 > 0:03:25And look how far it travels.
0:03:26 > 0:03:29Imagine if Chris had been ill when he sneezed.
0:03:29 > 0:03:32Every single one of those droplets could have contained
0:03:32 > 0:03:33disease-spreading germs.
0:03:33 > 0:03:36And that's why it's so important to cover your mouth.
0:03:37 > 0:03:40Now we're going to show you just how big and powerful
0:03:40 > 0:03:41a sneeze can be.
0:03:43 > 0:03:46We're going to create our own work of art.
0:03:46 > 0:03:48We'll both drink different coloured liquids
0:03:48 > 0:03:51then get a sneeze going to create our masterpiece.
0:03:51 > 0:03:54Get ready for germ art!
0:03:56 > 0:03:58OK, so are you going to go first?
0:04:09 > 0:04:12Now you'll notice an amazing splatter effect.
0:04:12 > 0:04:15And that's all down to the speed our sneezes are travelling.
0:04:15 > 0:04:17100mph, to be precise.
0:04:17 > 0:04:21And, remember, if we're ill, that would all be germs.
0:04:21 > 0:04:25Now, with all this sneezing, look what's started to happen.
0:04:25 > 0:04:26Yep, snot!
0:04:26 > 0:04:29And that's the mucus our bodies have created
0:04:29 > 0:04:31- to flush out what was making us sneeze.- Yuck!
0:04:31 > 0:04:34So we've shown you that both the cough and the sneeze
0:04:34 > 0:04:37are your body's brilliant way of getting rid of unwanted stuff.
0:04:37 > 0:04:41They're also both pretty good at spreading germs wherever they land.
0:04:41 > 0:04:44So don't forget to cover your mouth!
0:04:44 > 0:04:46- See you next time!- Bye!
0:04:46 > 0:04:48- Bye!- Bye!- Byee!- Bye!
0:04:48 > 0:04:51Byeee!
0:04:51 > 0:04:53- THEY MOUTH:- Bye.