Aluminum used to be more valuable than gold!
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In zero gravity, a candle's flame is round and blue.
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0.3% of solar energy from the Sahara is enough to power the whole of Europe.
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One cubic foot of gold weighs more than 1,200 pounds!
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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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A single speck of dust is half way in size between a subatomic particle and the Earth.
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Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
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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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