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Mars Climate Orbiter (1998)

This $193 million spacecraft got lost somewhere over Mars thanks to incompatibilities in its navigation system. The problem: The design team at Lockheed Martin built the craft’s measurement systems around Imperial (aka English, aka American) units instead of the metric system. Doh!

10 Biggest Technology Disasters of All Time

Eventually everyone gets unlucky — including government agencies and massive tech companies. In honor of Friday the 13th, we’ve selected 10 of the unluckiest mishaps in recent technology history. Hope your day is going better than it did for these folks. (All photos courtesy of Yahoo News except where indicated.)

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