Imperial units
A yard-and-pound system of measurement formalized in Britain in 1824. It influenced units still used in Britain and the U.S. customary system, but the two systems are not identical.
In 1999, NASA lost a $327.6 million Mars probe to a measurement unit mix-up. Lockheed Martin sent data in pound-force seconds; NASA entered it into a newton-second program without converting. The orbiter drifted off course and burned up in Mars's atmosphere.
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