/u/Jaleou's posts in /r/askscience
Are all of our cells replaced as we are, or can we point at a cell somewhere and say "that cell is 35 years old"?
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How do we know how long a year is? We don't have a mark in space showing exactly where the planet travels, showing we've been here before.
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What makes us feel full after eating? Would it be the volume of the food eaten, or the number of calories eaten?
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If everything else was the same, how would life (not just humanity or even mammalian life) be affected if the rotation of the earth was changed by say 25%
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If everything else was the same, how would life change if the rotation of the earth was changed by 25%?
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