I recall a seminar with the featured speaker being Grace Hopper. She had a long distinguished career with the Navy in the computer field. One of her stories dealt with the origin of the term "bug" in dealing with computer systems and software.

The early computing devices (circa 1940 time) were a series of relays. Hopper was in charge of a Navy computer facility in Rhoad Island when they experienced a problem with the computer system.

After spending many hours isolating the problem, they finally had the system back on line. The problem was traced to one relay where a moth had been trapped between the contact points. Seems that it was a warm summer evening and they ad the windows open for air .

So, the official problem report indicated that it was caused by a "bug" in the system. That term has been used since....