“Once upon a time the animals decided they must do something heroic to meet the problems of a ‘new world,’ so they organized a school. They adopted an activity curriculum consisting of running, climbing, swimming, and flying. To make it easier to administer the curriculum, all the animals took all subjects. The duck was excellent in swimming — in fact, better than his instructor; but he made only passing grades in flying and was very poor in running. Since he was slow in running, he had to stay after school and also drop swimming in order to practice running. This was kept up until his web feet were badly worn, so then he was only average in swimming. But average was acceptable in school, so nobody worried about that except the duck.” (>>)