Sound travels about 4 times faster in water than in air.
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Nearly 50% of the world's scientists are assigned to military projects.
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The earth is approx. 6,588,000,000,000,000,000 tons.
175
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
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
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!
21