The Earth's atmosphere weighs about 5.5 quadrillion tons.
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For every gallon of sea water, you get more than a quarter pound of salt.
45
Most liquid laundry detergents are alive with living organisms that help to break down stains!
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Scientists aren't sure what color dinosaurs were.
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Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
One barrel of petroleum holds 42 gallons.
20
One cubic foot of gold weighs more than 1,200 pounds!
78