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 sun is 330,330 times larger than the earth.
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Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
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Scientists are now able to grow 'beating' heart tissue in a lab!
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Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
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