At room temperature, the average air molecule travels at the speed of a rifle bullet.
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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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4.5 pounds of sunlight strike the Earth each day.
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Nylon is made from coal and petroleum.
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Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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