Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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One ragweed plant can release as many as one billion grains of pollen!
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
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In zero gravity, a candle's flame is round and blue.
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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!
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