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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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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Airports that are at higher altitudes require a longer airstrip due to lower air density.
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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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The average temperature at 40,000 feet above sea level is -60 F.
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The average home creates more pollution than does the average car.
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