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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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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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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One barrel of petroleum holds 42 gallons.
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One ragweed plant can release as many as one billion grains of pollen!
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