Pumice is the only rock that floats on water.
14
Out of all the senses, smell is most closely linked to memory.
146
Iron weighs more after it rusts.
68
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
A cesium atom in an atomic clock beats over nine billion times a second.
43
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
All Humans Are 99.9% Genetically Identical and 98.4% of human genes are the same as the genes of a chimpanzee.
51
The average temperature at 40,000 feet above sea level is -60 F.
56