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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Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
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There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
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A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
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0.3% of solar energy from the Sahara is enough to power the whole of Europe.
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Brass doorknobs automatically disinfect themselves in about 8 hours.
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4.5 pounds of sunlight strike the Earth each day.
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