The first actual computer bug was a moth. It was stuck in between the relays on the Harvard Mark II.[Aiken Relay Calculator ] While the invention of the term 'bug' is often but erroneously attributed to Grace Hopper, a rear admiral in the U.S. Navy, who supposedly logged the "bug" on September 9, 1945, most other accounts conflict at least with these details. According to these accounts, the actual date was September 9, 1947 when operators filed this 'incident' — along with the insect and the notation "First actual case of bug being found"(en.wikipedia.org/wiki/History_of_computer_science ). Since then the evaluation of computer Bugs take exponential function. This picture shows aftermath of Computer Bugs in my computer.