In 1947, engineers at Harvard encountered a problem with the Mark II Aiken Relay Calculator, a large computer used by the U.S. Navy.After investigating, they discovered that the problem was caused by a moth trapped in Relay #70, Panel F.The engineers removed the moth with tweezers and taped it into the logbook, coining the term 'debugging' as a result.The story of the moth serves as a reminder that even the most advanced technology can be affected by small, unexpected issues.