Aluminum used to be more valuable than gold!
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The earth is approx. 6,588,000,000,000,000,000 tons.
175
Sound travels about 4 times faster in water than in air.
408
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The force of a suction cup is calculated using F=AP.
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The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
4.5 pounds of sunlight strike the Earth each day.
27
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15