On this day, 9 September 1945, the first known computer bug was found and named by Lt. (later Rear Admiral !) Grace M. Hopper. On active duty at Harvard University, the cutting-edge calculation engine stopped working. Lt. Hopper discovered the bug — a moth — in the banks of circuitry, removed same, and logged it (complete with cello-tape of the offending moth to the log page). This and similar operations, mutatis mutandis, has become known as “debugging”.