The Earth's atmosphere weighs about 5.5 quadrillion tons.
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In zero gravity, a candle's flame is round and blue.
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Cold water weighs more than hot water.
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In the 1950s, the US government placed beer next to an atomic bomb blast to determine if it was still drinkable. The result: in the event of a nuclear war, beer is safe to drink!
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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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Airports that are at higher altitudes require a longer airstrip due to lower air density.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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One third of the electricity produced on earth is used to power electric light bulbs!
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