
In 1962, NASA's Mariner 1 probe to Venus veered off course and had to be destroyed 293 seconds after launch, and the postmortem traced the failure to a single missing overbar in the guidance code — one hyphen-sized mark that cost roughly $18 million in 1962 dollars.
On July 22, 1962, NASA's Mariner 1 Venus probe was destroyed 293 seconds after liftoff when a missing overbar in the guidance code caused an Atlas rocket to steer itself off course. The mark that would have prevented the failure was the width of a hyphen — and its absence cost roughly $18.5 million in 1962 dollars.












