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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Sound travels fifteen times faster through steel than through air.
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The average temperature at 40,000 feet above sea level is -60 F.
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One third of the electricity produced on earth is used to power electric light bulbs!
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Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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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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