"I am an optimist, because I believe that man is capable of solving his problems."

"The universe is a grand experiment, and we are all part of it."

"Physics is like sex: sure, it may give some practical results, but that's not why we do it."

"It is not possible that such a small difference in the atomic weights of hydrogen and helium could have such tremendous consequences."

"The atomic age is a new age, and we must learn to live in it."