Classic Engineer Joke:
An engineer, a scientist, a mathematician and an accountant are selected for a very simple contest. They must enter a room and solve a simple problem. How much is 2+2?
The Engineer enters the room and goes out in some 20 seconds, saying "well, rounding up, the result is approximately 4".
The Scientist goes in, and after 2 minutes, comes out and says "the result is 4 with a .02% error probability".
The Mathematician is next, and it takes him 3 hours, but at last he comes out and states "the series converges and the limit is 4".
The accountant calls the judge to the room, locks all doors, closes all windows and asks: "how much do you want it to be?"

Daniel