The Earth's atmosphere weighs about 5.5 quadrillion tons.
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All Humans Are 99.9% Genetically Identical and 98.4% of human genes are the same as the genes of a chimpanzee.
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Cold water weighs more than hot water.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
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Indoor pollution is 10 times more toxic than outdoor pollution.
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Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
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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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