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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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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Most dust particles in your house come from dead skin.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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In zero gravity, a candle's flame is round and blue.
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Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
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