Every now and then, something will pop up in an auction that sets geeks drooling. Whether it's an undiscovered Macintosh prototype or a famous movie prop, the chance to own a piece of history can drive us to extremes. But the combined fanaticism of Apple devotees and sci-fi fans will likely have more destructive potential than the Genesis device when this relic shows up on sensors: an early Macintosh Plus, given by Apple Computer Inc. to Star Trek creator Gene Roddenberry.