Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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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.
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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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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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Brass doorknobs automatically disinfect themselves in about 8 hours.
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Most dust particles in your house are made from dead skin!
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A 'jiffy' is an actual unit of time for 1/100th of a second!
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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