Iron weighs more after it rusts.
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One cubic foot of gold weighs more than 1,200 pounds!
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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
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
German chemists made a replica of a trophy the size of one molecule.
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If the chemical sodium is dropped into water it will immediately and violently explode.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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