In 1999, NASA's Mars Climate Orbiter disintegrated in the Martian atmosphere because one engineering team used metric measurements and another used imperial units. Nobody caught the mismatch until the spacecraft was already destroyed. It's the most expensive unit conversion error in human history.
Mar 13, 2026
In 1958, a U.S. Air Force B-47 dropped a fully armed hydrogen bomb into the ocean near Tybee Island, Georgia, after a mid-air collision. The military searched. They didn't find it. Sixty-plus years later, it's still down there — and Tybee Island is still a popular vacation destination.
Mar 13, 2026