During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
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Cold water weighs more than hot water.
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One 75-watt bulb gives more light than three 25-watt bulbs.
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In zero gravity, a candle's flame is round and blue.
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0.3% of solar energy from the Sahara is enough to power the whole of Europe.
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