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I might be wrong but it might have something associated with the numerical goals we acheive as children, young adults and grown up. For example, becoming 10 years of age is a sign of maturity, mainly due to the double digits it contains. This leads us (as children) to believe that we are that much closer to becoming adults. When people turn 40 or 50 they put ...


Because round numbers are easier than full numbers. For instance, $$10^9=1000000000$$ saves a lot, instead of $$997843863678632762767267863$$ I do not know how to give you a short description of this number.

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