Sound travels about 4 times faster in water than in air.
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0.3% of solar energy from the Sahara is enough to power the whole of Europe.
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Pumice is the only rock that floats on water.
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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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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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There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
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Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
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