A mathematician, an engineer, and a physicist are being interviewed for a
job. In each case, the interview goes along famously until the last
question is asked: “How much is one plus one?”
Each of them suspects a trap, and is hesitant to answer.
The mathematician thinks for a moment, and says “I’m not sure, but
I think it converges”.
The physicist says “I’m not sure, but I think it’s on the order of one”
The engineer gets up, closes the door to the office, and says “How much
do you want it to be?”.