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Why do people from different countries look different to each other? 5 Sep 2012 | 09:45 am

Actually, people from different countries look pretty much the same. The differences that do exist - like skin colour and eye shape - are due to where our ancestors lived, and how they spread out from...

Why do we walk on two legs (instead of four)? 5 Sep 2012 | 09:39 am

To be honest - we don't know for sure. Our ancestors may have started the habit to help gather food, to defend themselves or even to wade across rivers! We really don't know? Well, there are lots of...

Why are some belly buttons 'innie' and others 'outie'? 5 Sep 2012 | 09:33 am

Because a belly button, or umbilicus, as it's properly called, is really a scar formed from your lopped-off umbilical cord. Depending on how the scar heals up, you get either a cavity ('innie') or a p...

Why do you feel hot when you have a cold? 3 Sep 2012 | 06:19 pm

Because your body turns up the heat on purpose to help fight off the nasties. After all, it's a virus - not cold weather - that causes the cold in the first place. Don't you catch a cold because you ...

Why do other people yawn after you do? 3 Sep 2012 | 06:03 pm

Tricky one, this. Lots of animals yawn, but only humans and chimps find it catching. It's not to get more oxygen, as we used to believe. The best guess yet is that it's a signal - telling you and othe...

Why does your poo go runny when you get diarrhoea 3 Sep 2012 | 12:23 pm

All poo starts out looking like diarrhoea. But yourbody usually dries it out in the final lap through your guts. It's when your guts get upset that the world falls out of your bottom... Gross! So you...

Why do your eyes go blurry underwater? 3 Sep 2012 | 12:12 pm

Because our eyes are made to work in air. If we surround them with water instead, the light entering the eyes gets bent too much, and we can't focus well enough to see clear shapes. FotografĂ­a hecha ...

Why is Snot green? 1 Sep 2012 | 01:36 pm

Basically, because it's the result of a fight between nasty bugs and body cells that make a green-coloured goo. What?! Seriously. Snot is made of a sticky substance produced inside the nose that tra...

Why are there no dinosaurs any more? 23 Aug 2012 | 09:32 pm

Most of the dinosaurs were wiped out 65 million years ago, probably after a huge meteorite impact destroyed their environment. But there are still some around, if you know where to look for them... W...

Why can't whales and dolphin breathe underwater? 23 Aug 2012 | 09:23 pm

Because they evolved to breathe on land first, and unlike fish they have lungs instead of gills. So what's the difference between lungs and gills? Well, they're both used for the same thing: getting...

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