One cubic foot of gold weighs more than 1,200 pounds!
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Pumice is the only rock that floats on water.
14
Iron weighs more after it rusts.
68
Research indicates that plants grow healthier when they are stroked.
173
For every gallon of sea water, you get more than a quarter pound of salt.
45
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
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