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

Everyone is colourblind at birth. See more

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

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