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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Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
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Brass doorknobs automatically disinfect themselves in about 8 hours.
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Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
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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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Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
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Some toothpastes and deodorants contain the same chemicals found in antifreeze.
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