Obvious facts are sometimes not so obvious when we have to prove them. That's what the narrator of this story finds out when his classmate refuses to believe that the earth is round.Mrs. Markum, an elementary school teacher, hands out clay spheres and asks her class to decorate them with continents and oceans. One boy, Stan, crushes his sphere flat, insisting that the earth is shaped like a pancake. When he winds up in the principal's office, our...