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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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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4.5 pounds of sunlight strike the Earth each day.
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If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
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For every gallon of sea water, you get more than a quarter pound of salt.
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A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Nearly 50% of the world's scientists are assigned to military projects.
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