“如果发生了大灾难，使得一切科学知识都将销毁，我们只能留下一句话给后代的生物，用最少的字却可以包容最多信息的那一句话是什么呢？”这是大物理学家费曼在一次给学生上物理课时提出的。听到这样直截了当又生动的问法，学生很难不急切着想要知道答案。而费曼的答案是什么? “If there was a catastrophe, so that all scientific knowledge would be destroyed, we could only leave a word for the creatures of future generations. What is the phrase that can contain the most information with a minimum number of words?” This is a big physicist. Feynman made a physics class for students. When you hear such a straightforward and lively questioning method, it is difficult for students to be eager to know the answer. What is Feynman’s answer?