ON SEPTEMBER 23, 1999, the... «97 Things Every Programmer Should Know: Collective Wisdom from the Experts»
ON SEPTEMBER 23, 1999, the $327.6 million Mars Climate Orbiter was lost while entering orbit around Mars due to a software error back on Earth. The error was later called the metric mix-up. The ground-station software was working in pounds, while the spacecraft expected newtons, leading the ground station to underestimate the power of the spacecraft’s thrusters by a factor of 4.45.