========================================== A Mathematician, a Biologist and a Physicist are sitting in a street cafe watching people going in and coming out of the house on the other side of the street. First they see two people going into the house. Time passes. After a while they notice three persons coming out of the house! The Physicist : "The measurement wasn't accurate". The Biologist's : "They have reproduced". The Mathematician : "If now exactly 1 person enters the house then it will be empty again." =============================================== An engineer, a physicist, and a mathematician are shown a pasture with a herd of sheep, and told to put them inside the smallest possible amount of fence. The ENGINEER is first. He herds the sheep into a circle and then puts the fence around them, declaring, "A circle will use the least fence for a given area, so this is the best solution." The PHYSICIST is next. She creates a circular fence of infinite radius around the sheep, and then draws the fence tight around the herd, declaring, "This will give the smallest circular fence around the herd." The MATHEMATICIAN is last. After giving the problem a little thought, he puts a small fence around himself and then declares, "I define myself to be on the outside!" ========================================