
Humans have a number of organs which we don't actually need. Tonsils and appendices are routinely removed, but you can also live reasonably well without your spleen, gall bladder, a kidney, or even your stomach.
The longest someone has survived without water is 18 days: Andreas Mihavecz was forgotten in a prison cell without food or water.
Humans shed an entire layer of skin every couple of days, but because the layer of skin is so fine it only amounts to about 2 grams a day.
Scientists think humans lost our body hair half a million years ago, and from then on it was attractive to be hairless. Hairless humans could show they didn't have diseases carried by lice or fleas, and didn't have to groom as much and so freeing up time to look for food.
It is possible to survive falling from a tall building, or even an aeroplane, without a parachute. The key to surviving is to land on something which slows you down gradually: one skydiver survived a fall of 4km by landing in a blackberry bush.
Bizarrely, capsaicin, the chemical in chilli peppers that causes us pain when we eat them, is being tested as a new form of pain relief. The capsaicin helps knock out only pain receptors without numbing large parts of the body.
One of the world's tallest buildings, the Taipei 101, has a giant 660 tonne pendulum suspended between the 88th and 92nd floors. This counteracts the swaying of the top of the building, holding it steady in strong winds.
More than 250 people have signed up to go into space with Virgin Galactic. These flights will take passengers over 100km above the Earth into what is technically known as 'outer space'.
A car averages only 7mph in rush hour London while it is estimated that an average cyclist goes twice that fast.
The inventor of the microwave oven was alerted to the cooking power of microwaves when a chocolate bar in his pocket melted as he stood in a microwave beam. The second food he cooked was popcorn.
