A relay could also fail because of a piece of dirt or paper stuck between the contacts. In one famous incident in 1947, a moth was extracted from a relay in the Harvard Mark II computer. Grace Murray Hopper (1906–1992), who had joined Aiken’s staff in 1944 and who would later become quite famous in the field of computer programming languages, taped the moth to the computer logbook with the note “first actual case of bug being found.”
