[T]he phrase "debugging a computer" was coined in 1947 when Harvard researchers found a moth crushed between the jaws of a relay switch in a Mark II Aiken Relay Calculator. The dead moth was taped to the machine's logbook, which now resides at the National Museum of American History of the Smithsonian Institution. Whenever the machine broke down, which was often, operators would quip that they were "debugging" it.