Pumice is the only rock that floats on water.
14
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Sound at the right vibration can bore holes through a solid object.
134
Your brain is 80% water.
525
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51