"I have been very lucky in my life, because I have always been able to do what I love."

"The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'"

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

"I believe that the future of humanity depends on our ability to control the forces that we have unleashed."

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