Sound travels about 4 times faster in water than in air.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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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
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.
13
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The only letter not appearing on the Periodic Table is the letter "J".
180