The average temperature at 40,000 feet above sea level is -60 F.
56
A cubic yard of air weighs about 2 pounds at sea level.
31
Pumice is the only rock that floats on water.
14
Most dust particles in your house come from dead skin.
48
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Nylon is made from coal and petroleum.
42
For every gallon of sea water, you get more than a quarter pound of salt.
45