So an engineer, a psychologist, and a physicist are called into a dairy farm that is low on production... They're each given a day to inspect the farm, then they each deliver a thesis on how best to increase production. The engineer goes first; he says that if each stall is decreased in area by 40 inches, housing capacity could be doubled. The psychologist then says that if the walls were painted green the cows would be more relaxed and likely produce more milk. When the physicist is called in he immediately draws a circle on a blackboard and says, ""Now assume a cow is a sphere...""