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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In zero gravity, a candle's flame is round and blue.
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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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The bark of an older redwood tree is fireproof.
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The average home creates more pollution than does the average car.
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One barrel of petroleum holds 42 gallons.
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Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
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