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the american scientific community has been metric for a long time. it just makes a lot more sense when you deal with a variety of variables. the comprehensive english set of weights and measures is a goofy relic. to make a calculation, it's easier to first convert to metric and convert back after you have finished.
farenheit is a bit more precise, and certainly pounds, miles, and feet are second nature to americans. i don't think that will change.
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