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

Your skin weighs about 3.2 kg. See more

A teaspoon of neutron star material weighs about 110 million tons. See more

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

Human thigh bones are stronger than concrete. See more

You're born with 300 bones, but when you get to be an adult, you only have 206. See more

In a year, your heart can beat up to 40,000,000 times!. See more

Most marine fish can survive in a tank filled with human blood. See more