Optical illusions occur when what the eyes see conflicts with what the brain expects.
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There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
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A cesium atom in an atomic clock beats over nine billion times a second.
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Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
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A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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