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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In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
5
Aluminum used to be more valuable than gold!
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Nearly 50% of the world's scientists are assigned to military projects.
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Each day, up to 150 species of life become extinct.
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Pumice is the only rock that floats on water.
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