/r/askscience
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Why are electromagnetic waves depicted as moving "up and down"? Why don't photons go in a complete straight line?
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If all life in Earth originated from the same source, what is the common ancestor between animals and plants?
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Are human brains hardwired to determine the sex/gender of other humans we meet or is this a learned behaviour?
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Does blotting greasy foods (pizza, fries) remove a non-negligible amount of fat and calories? or is it mostly moisture?
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