Most dust particles in your house come from dead skin.
48
Pumice is the only rock that floats on water.
14
Scientists aren't sure what color dinosaurs were.
312
For every gallon of sea water, you get more than a quarter pound of salt.
45
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A cesium atom in an atomic clock beats over nine billion times a second.
43
Aluminum used to be more valuable than gold!
84