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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In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
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When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
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Nylon is made from coal and petroleum.
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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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