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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4.5 pounds of sunlight strike the Earth each day.
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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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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Iron weighs more after it rusts.
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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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