"Never make anything more accurate than it needs to be."

"Never underestimate the power of a good approximation."

"The fundamental problem is that we do not know enough to do a good job."

"One might be led to question whether the scientists acted wisely in presenting the statesmen of the world with this appalling problem. Actually there was no choice. Once basic knowledge is acquired, a…"

"One day, when I was a student, I was reading a book on quantum mechanics, and I came across a sentence that said: 'The electron is a wave, and the electron is a particle.' I was very confused, because…"