The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Balsa wood is classified as a hard wood!
41
According to studies, men change their minds two to three times more often than women.
72
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
For every gallon of sea water, you get more than a quarter pound of salt.
45
Sound at the right vibration can bore holes through a solid object.
134