Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
One barrel of petroleum holds 42 gallons.
20
Pumice is the only rock that floats on water.
14
Your brain is 80% water.
525
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
