Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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A cesium atom in an atomic clock beats over nine billion times a second.
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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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In zero gravity, a candle's flame is round and blue.
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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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4.5 pounds of sunlight strike the Earth each day.
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