Did you know that...? Five surprising facts...

Every square centimetre of our skin has as many hairs as a square centimetre of chimpanzee skin. Only ours are less thick and lighter in colour!

Human bones, harder than many types of steel.

The nails on the hands grow four times faster than those on the feet. The fastest growing nail is on the middle finger. And it's on the hand that you use most often! Also, the speed at which your nails grow is closely linked to the length of your fingers.

To take just one step, our brain activates up to 200 different muscles in our body.