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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Nearly 50% of the world's scientists are assigned to military projects.
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One 75-watt bulb gives more light than three 25-watt bulbs.
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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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The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
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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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