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.
5
Aluminum used to be more valuable than gold!
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Nearly 50% of the world's scientists are assigned to military projects.
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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
The smell of freshly cut grass is actually a plant distress call.
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Pumice is the only rock that floats on water.
14