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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A cubic yard of air weighs about 2 pounds at sea level.
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Neanderthal man had a brain capacity 100cc larger than modern man's.
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German chemists made a replica of a trophy the size of one molecule.
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Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
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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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A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
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