A mathematician and an engineer agree to a psychological experiment. They are to be put in a chair in a large empty room and a beautiful naked woman is placed on a bed at the other end of the room.
The psychologist explains, "You are to remain in your chair. Every five minutes, I will move your chair to a position halfway between its current location and the woman on the bed."
The mathematician looks at the psychologist in disgust. "What? I'm not going to go through this. You know I'll never reach the bed!" And he gets up to storm out. The psychologist makes a note on his clipboard.
Meanwhile, the engineer's eyes light up and he starts drooling. The mathematician turns and yells, incredulous "Don't you realise? You'll never reach her!"
The engineer smiles and replied, "Of course! But pretty soon I'll be close enough for all practical purposes!"