Brass doorknobs automatically disinfect themselves in about 8 hours.
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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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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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Sound at the right vibration can bore holes through a solid object.
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Indoor pollution is 10 times more toxic than outdoor pollution.
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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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