for years. and from berkeley, california dr. richard multi-cultural teaches physics at uc university. author of the book "physics for future presidents." secretary of energy didn't give us much there, doctor. took them 30 seconds to say i don't know anything. why didn't he say that in two seconds? that is a frustrating thing for me as a journalist. i'm sure for you as a physics instructor and for the american people. we simply don't know what's happening vis-a-vis the nuclear issue or am i wrong? >> i think we know a lot about what's happening. i believe the secretary of energy knows a lot. there is always a danger when you are in an official position of trying to be completely candid with what's going on because if you get one fact wrong, people come after you afterwards. i believe we really do know a lot. >> bill: what was mr. chu holding back, professor, what was mr. chu holding back? if you think he knows more than what he said, which was nothing, what was he holding back in your