The earth is approx. 6,588,000,000,000,000,000 tons.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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Nearly 50% of the world's scientists are assigned to military projects.
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Sound travels about 4 times faster in water than in air.
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Sound travels fifteen times faster through steel than through air.
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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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One gallon of used motor oil can ruin approximately one million gallons of fresh water!
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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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