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meters, grams, & liters
length in dollar bill in pixels
Milk, toothpaste, string, flour
OLS leads to a closed-form solution. The problems in other metrics such as L1 do not. Furthermore, the statistical theory for OLS is much richer than for other metrics in spite of the fact that OLS leads to difficulties in dealing with 'outliers'.
130,000 mph = 209,214.7 km/hr (rounded)