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After I've been outside playing all day, nothing feels quite as a good as a nice warm bath.

Sometimes I might even stay in the tub a little longer than usual, and when I /do/ finally

get out, I notice that my fingers and toes are kind of ... wrinkly, or pruney, almost

like a raisin!

Maybe that's happened to you, too, if you've been swimming for a long time, or even just

doing some fun water experiments in the sink!

Have you ever wondered why that happens?

Well, scientists have wondered that, too!

And they've learned that it has a lot to do with what our skin is made of, and how

water is so slippery.

Skin covers the whole outside of our bodies, and it's pretty special stuff.

Even though it's hard to tell from the outside, skin is actually made up of layers, and each

layer has different parts.

Now, if we could look at the layers of our skin /very/ closely, they would look something

like this.

There's so much in there!

We have something called vessels in our skin, which are the tubes that carry blood in our bodies.

These vessels are /very/ small and thin, but they're really important!

They can open up wide, or they can shrink down and kind of close up a little bit on the inside.

That's what happens when you've been wet for a long time — those tiny vessels shrink down.

And when they shrink down, that big layer of skin they're inside of gets a /little/ thinner.

When /that/ layer gets thinner, it causes the top layer of skin to relax and get a little looser.

And that's what causes the wrinkles!

The top layer of skin is kind of like a piece of cloth.

When it's pulled tight, it's not wrinkled.

But when it relaxes … it gets wrinkly!

So that's /how/ your fingers get wrinkly.

But /why/ do they get wrinkly — why does it help you to have wrinkly fingers and toes?

Scientists don't know for sure, but they've done /lots/ of experiments, and they think

it's to help you hold things better in the slippery water!

During one experiment, a group of scientists asked people to soak their hands in water,

and to let them get all wrinkled and pruny.

Then they asked the people with pruny fingers to try and pick up small, slippery objects underwater.

Then they asked people who didn't have wrinkly fingers to do the same thing.

Well, it turns out that the people who had pruny hands could pick up the objects underwater

/faster/ than the people who /didn't/ have pruny hands!

It's like the wrinkles on our fingers give us a special grip when it's wet.

Have you ever seen pajamas or slippers with bumps on the bottom of the feet?

The bumps are there because they help keep you from slipping on the floor and falling down.

The wrinkles are kind of the same: they make your fingers more bumpy, which helps you hold

onto things without them slipping through your fingers.

So, as weird as pruny fingers and toes might look, they can be pretty useful!

And once you dry off and wait a little bit, the vessels inside your skin open up again,

and your skin goes back to normal — at least until the next time you take a long bath!

Thanks for joining us on SciShow Kids!

We /love/ getting questions here at the Fort!

So if you have any questions about our bodies, or anything at all, grab a grownup to help

you leave a comment down below, or to send us an email at kids@scishow.com!

For more infomation >> Why Do I Get Wrinkly Fingers in the Bath? - Duration: 3:25.

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Why do Balkan boys get a bad rap? - Duration: 4:42.

How's it going?

Don't you want to put something more comfortable on?

No idea. What do you mean?

Perhaps something like this.

And? Better, yeah?

Really - a tracksuit?

You said something more comfortable.

I imagined something in between. Like this.

That's what I imagined. This is Sven, as I know him.

Hello Sven. Hey Tama.

He's a bit nervous. You're actually a stand-up comedian.

My Scandinavian first name doesn't really

fit that well with my Balkan head shape.

You stand in front of people

who watch you and have expectations

and now you're just looking at a camera and that's making you nervous.

Yeah, it's making me very nervous.

I don't know if your laugh is genuine.

You're half Croatian, half Serbian.

Yes. And Swiss.

And 100% Swiss.

So, we have a 200% nationality. Whaaat?

You're a lawyer.

When you're with your colleagues,

do you not act the "Oberyugo",

Playing up your "Yugo" side?

Are you even allowed to say that if you're not a Yugoslav?

You simply always have to see how it's meant.

It's easy now in this context but if an old man on the train shouts to me: Hey Yugo...

...that's not on.

Then it's quite frankly nasty.

I don't have many lawyers in my circle of foreign friends.

I think that's a preconception.

Many lawyers are foreigners.

Swiss people with a migrant background, that is.

Look, he's even right about this.

For me, a foreigner is someone

who has been in Switzerland for three days and is leaving again tomorrow.

I'm a Swiss foreigner.

A new Swiss or whatever.

They don't end up in the headlines of a certain media

because nobody reports about the "ic" who's a PHD student

– nobody's interested.

But when Mr "ic" is caught speeding, then you hear about it.

Are there certain disadvantages to having a surname ending in "ic"?

I'm in the generation that got away with it.

I was born in the 90s.

There weren't any disadvantages for me, quite the opposite.

People think, "ic" – can they even read and write?

And if you can, they're shocked.

When I was 5, Swiss-Balkan relations

were still noticeably strained.

The mood and rhetoric used to be different.

If someone is called "Ivan. S" and is a rapist,

then you are associated with sex offenders.

That doesn't make you feel particularly nice.

Like you're a black sheep, that's being kicked out.

Let's talk about stereotypes.

Everyone from the Balkans is tall.

Well yeah, I'm 1.95 metres tall.

That means I'm one of the shorter Croatians.

Sometimes you feel really small

but when you're back in Switzerland, then you're the boss again.

You're criminals. And you all speed.

Factors that make someone a criminal are of course not nationality

but if you're a man under the age of 25

then it's likely that you'll end up being in trouble with the law.

If you compared young Swiss men with young foreign men,

the crime statistics would be fairly similar.

What prejudices still exist? Oh yeah, tracksuit bottoms.

You all wear tracksuit bottoms.

I want to answer that with a question: Why not?

In Basel, they wanted to ban tracksuits in secondary schools.

Tracksuits aren't just associated with antisocial behaviour.

Or people who only watch RTL2.

For me, tracksuits are also part of a sub-culture.

People don't get that.

People see a punk with a mohawk hairstyle, they can accept that.

With ripped jeans, a goth...

...but somehow nobody accepts the whole hiphop youth culture.

And tracksuits are bad per se.

I want to clear up this prejudice.

There are actually a lot of elegant, tailored tracksuits.

Many of my friends have the problem that while they look great in a suit,

they're missing that certain Balkan element.

I'll show you how they can get around this.

Do you think that schools should allow or ban tracksuits?

I'd like to know your thoughts.

I hope you enjoyed the video.

Thumbs up!

Just give me some love. Ok?

See you next time, bye!

For more infomation >> Why do Balkan boys get a bad rap? - Duration: 4:42.

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Why Do We Sigh? - Duration: 1:59.

How often do you sigh?

You only sigh when you're sad or frustrated, right?

Well, you actually sigh about 12 times each hour.

That's once every 5 minutes.

You might not notice it,

but if you don't sigh this frequently your lungs would collapse.

Your lungs have tiny air sacs in them called alveoli.

They are about 0.2 mm in diameter, and they are responsible for the gas exchange between

your lungs and your bloodstream.

The inner walls of the alveoli are coated with a thin layer of water.

When you exhale the walls come closer together, and the surface tension of the water can make

it very difficult for your alveoli to re-inflate.

This makes your alveoli collapses and less oxygen is passes into your blood.

A sigh is a longer-than-usual breath and you take in twice the normal volume of air.

Sighing re-inflates your alveoli, and you don't die from a collapsed lung.

Sighs aren't voluntary.

Sighing is controlled by a pair of neuron clusters in your brain stem.

These neurons release peptides that control your breathing, which includes yawing and sighing.

Sighing is related to emotions.

We sigh more often when are stressed, and also when we are relaxed.

This could be because sighing is related to feeling relieved.

We sigh more often when we are relaxed because we feel relieved, but also when we are stressed

to make ourselves feel more relieved.

So, people who sigh more often feel more relieved.

Yet, researchers noted in a 2008 paper that we associate negative emotions with sighing.

We interpret other people's sighs a sign of sadness.

And we interpret our own sighs as tiredness, boredom, or frustration.

*sigh* I'm so happy I'm done with this video.

If you liked it give it a thumbs up and don't forget to subscribe.