Brass doorknobs automatically disinfect themselves in about 8 hours.
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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.
5
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
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MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Iron weighs more after it rusts.
68
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Cold water weighs more than hot water.
93
The average home creates more pollution than does the average car.
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