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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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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MIT has developed a camera that captures the speed of light at a trillion frames per second.
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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 use of emoticons affects our corresponding brain areas and can actually trigger emotions.
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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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For every gallon of sea water, you get more than a quarter pound of salt.
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