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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Out of all the senses, smell is most closely linked to memory.
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Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
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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 Earth's atmosphere weighs about 5.5 quadrillion tons.
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Sound at the right vibration can bore holes through a solid object.
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Nylon is made from coal and petroleum.
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A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
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