In 1945, LTJG Grace Murray was working on the Harvard University Mark II Aiken Relay Calculator. While testing Mark II due to a malfunction, a moth was found trapped between points at Relay #70, Panel F on 9 September. The operators removed and affixed the moth to the computer log, with the entry: "First actual case of bug being found." They put out the word that they had "debugged" the machine, thus introducing the term "debugging a computer program."
Although, Hopper was always careful to admit that she was not present when the moth was discovered, it was one of her favorite stories.
In 1988, the log, with the moth still taped by the entry, was found in the Naval Surface Warfare Center Computer Museum at Dahlgren, Va.