Anecdote: the first ‘bug’ (1945)
Grace Murray Hopper, working in a temporary World War I building at Harvard University on the Mark II computer, found the first computer bug (a moth) beaten to death in the jaws of a relay.
She glued it into the logbook of the computer and thereafter when the machine stopped (frequently) they would tell Howard Aiken that they were "debugging" the computer.
The very first bug still exists in the National Museum of American History of the Smithsonian Institution. The word bug and the concept of debugging had been used previously, perhaps by Edison, but this was probably the first verification that the concept applied to computers.
Microprocessor-based System Design Ricardo Gutierrez-Osuna Wright State University