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Yeah, but when there are different units for the same thing used in a project, then at some point of time the engineers discover that their calculators disagree ~ https://www.cbc.ca/archives/when-a-metric-mix-up-led-to-the-gimli-glider-emergency-1.4754039 :)

Oh Dang!! That is crazy!! Oops... my bad, you only have half the fuel you actually need... good luck ;)