Half Measures - 99% Invisible    

written by Roman Mars. added over 1 year ago by @icyflame ARCHIVES

podcast 99pi units unit-systems    

Scientists at NASA began to pour over the data, looking for clues about what went wrong. They eventually discovered that a simple conversion error was to blame. NASA was using the metric system, the international standard, for its calculations. But one of their contractors was using U.S. Customary Units, which is the proper term for the American system of inches, pounds, and gallons. Years of planning and hundreds of millions of dollars were lost, all because someone did the right calculation but in the wrong units.

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