Thread drift alert... Male engineer and mathematician are set at the start line. Naked woman at finish line. Rules are that each time starter blows whistle, racers can advance one half the distance to the finish line and whistle will blow again as soon as first racer reaches his half distance and comes to a complete stop. First whistle blows and engineer makes a mad dash. Mathemetician stands at start line and laughs. Starter asks why and he replies, "If you only go half the distance each time, you'll never arrive." Starter tells this to engineer and he replies, "Yeah, I know. But for all practical purposes, I'll get close enough."