A mathematician and an engineer are put at one end of a 100 foot long room. At the other end is a gorgeous naked young woman who exhibits all the signs of being ready.
The two men are told: Whoever gets there first can have his way with her, BUT, you may only cover half the remaining distance in each move.
The engineer immediate sets about measure the room, and calculating the distances involved, and begins his first move.
The mathematician looks at him in surprise and says, "What are you doing, man? You'll never get there, it's impossible given the requirements."
The engineer says, "True. But I can get close enough..."

