“A scientist doesn't know all the answers. Nobody does, not even teachers. But a scientist keeps on trying to find the answers.”

“Lots of things are mystries. But that doesn't mean there isn't an answer to them. It's just that scientists haven't found the answer yet.”

“Lots of things are mysteries. But that doesn't mean there isn't an answer to them. It's just that scientists haven't found the answer yet.”

“There are certain questions that scientists may not ask, or, more accurately, for some questions, there are certain answers that scientists must a priori preclude from consideration.”

“A scientist may not be sure of the answer, but he's often sure he can find one. And that's a condition which is clearly not enjoyed by philosophy.”

“A scientist shouldn't be asked to judge the economic and moral value of his work. All we should ask the scientist to do is find the truth and then not keep it from anyone.”