A graduate student who is still learning courses is not really taking a maximum advantage of a research university's offerings. He should already be finished with course-taking, as he would then be able to shape his own taste about what is a good subject for research work in the graduate school.

I think America is a new country. It is a young culture. The spirit of the opening of the West is still with the Americans. It's a very practical and individual-based kind of philosophy that had worked in America for a long time, had been very successful. And the spirit is very much there.

As I stand here today and tell you about these, I am heavy with an awareness of the fact that I am in more than one sense a product of both the Chinese and Western cultures, in harmony and in conflict.

The law of right-left symmetry was used in classical physics but was not of any great practical importance there. One reason for this derives from the fact that right-left symmetry is a discrete symmetry, unlike rotational symmetry, which is continuous.