All the chemicals in the human body have a combined value of approximately £4.00. See more

Those stars and colours you see when you rub your eyes are called phosphenes. See more

Banging your head against a wall uses 150 calories an hour. See more

A single individual, Dr. Lieven P. Van Neste, owns over 200,000 domain names! See more

You use over 70 muscles to say one word. See more

Plants that are not cared for will cry for help, a thirsty plant will make a high-pitched sound that is too high for us to hear. See more

The electric chair was invented by a dentist. See more

There are 100 million internet users in China. Some of the sites they can't access are BBC news, Amnesty International and Dalailama.com. See more

Astronaut Neil Armstrong first stepped on the moon with his left foot. See more