Raphael is in biology class. Each student is dissecting a cockroach. He cuts off one leg, and says, “walk,” … it walks. … … He cuts off the 2nd and 3rd legs and says, “walk,” … it walks. … He cuts off all the remaining legs and says, “walk….” The cockroach doesn’t move. Finally, Raphael writes his conclusion…… “After all the legs of a cockroach are cut off - it becomes deaf.”