The second grade teacher in elementary school was teaching some very simple principles of physics. One the several things she taught about was a magnet. She explained the basic principle of magnetic attraction and demonstrated it using a magnet to pick some small metal objects. On Friday, she gave the class a test on some lessons taught that week. One of the questions read: “My name has six letters and starts with M and I pick up things. What am I?” She was somewhat surprised when she graded the papers that more than one-half of the class answered: “MOTHER”!