Wearing headphones for just one hour will multiply the number of bacteria in your ear 700 times. See more

Sex burns 360 calories per hour See more

Average number of people airborne over the US any given hour: 61,000. See more

A cat has 32 muscles in each ear. See more

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

10% of human dry weight comes from bacteria. See more

There are more bacteria in your mouth than the human population of the U.S.A. and Canada combined. See more