After the lecture, I talked to a student: “You take all those notes—what do you do with them?” “Oh, we study them,” he says. “We’ll have an exam.” “What will the exam be like?” “Very easy. I can tell you now one of the questions.” He looks at his notebook and says, “‘When are two bodies equivalent?’ And the answer is, ‘Two bodies are considered equivalent if equal torques will produce equal acceleration.’” So, you see, they could pass the examinations, and “learn” all this stuff, and not know anything at all, except what they had memorized.
