Optical illusions occur when what the eyes see conflicts with what the brain expects.
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Most dust particles in your house come from dead skin.
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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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Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21
Hot water can freeze faster than cold water.
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Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
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