“A graduate student who is still learning courses is not really taking a maximum …” — Chen-Ning Yang

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.

Qinghua was first established as a preparatory school in 1911. In 1928, it became a university. In 1929, my father joined Qinghua as a professor, so that was also the year that I moved to that campus because my father brought the whole family along.

The application of group theory to physics became one of the main branches of physics that I specialized in.

The strongest interactions are the nuclear interactions, which include the forces that bind nuclei together and the interaction between the nuclei and the z mesons. It also includes the interactions that give rise to the observed strange-particle production.