A day on the planet Mercury is twice as long as its year. See more

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

The 'save' icon on Microsoft Word shows a floppy disk, with the shutter on backwards. 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

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

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

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

The electric chair was invented by a dentist. See more

The heart beats about 100,000 times each day. See more