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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Airports that are at higher altitudes require a longer airstrip due to lower air density.
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Cold water weighs more than hot water.
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The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
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A cubic yard of air weighs about 2 pounds at sea level.
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During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
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The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
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Each day, up to 150 species of life become extinct.
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