The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
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At room temperature, the average air molecule travels at the speed of a rifle bullet.
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A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Aluminum used to be more valuable than gold!
84
Sound travels fifteen times faster through steel than through air.
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