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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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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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Sound at the right vibration can bore holes through a solid object.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
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Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
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