It is possible to lead a cow upstairs but not downstairs. See more

Elephants are the only animals that can't jump. See more

You can't kill yourself by holding your breath. See more

111,111,111 x 111,111,111 = 12,345,678,987,654,321. See more

Everyone is colourblind at birth. See more

If you take a pencil, you can draw a 50 kilometer (31 mile) long line. See more

28% of Africa is wilderness. See more

Eels have two hearts. See more

To escape the grip of a crocodile's jaws, push your thumbs into its eyeballs, it will let you go instantly. See more