"Before the war, I was doing pure physics. Now I am doing applied physics. But it is still physics."

"I remember my friend Johnny von Neumann used to say, 'with four parameters I can fit an elephant and with five I can make him wiggle his trunk.'"

"There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery."

"Don't ever do a calculation without knowing the answer."

"The best way to understand something is to try to explain it to someone else."