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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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
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One 75-watt bulb gives more light than three 25-watt bulbs.
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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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The bark of an older redwood tree is fireproof.
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