Scientific theories need reconstruction every now and then. If they didn't need reconstruction they would be facts, not theories. - Charles Proteus Steinmetz

We don't know the why of anything. On that matter we are no further advanced than was the cavedweller. The scientist is contented if he can contribute something toward the knowledge of what is and how it is.

In this country all a man need to do is to attain a little eminence and immediately he begins to talk. … But the American people are willing to listen to any one who has attained prominence. The main fact is that we've heard a man's name a great many times; that makes us ready to accept whatever he says.

There are no foolish questions and no man becomes a fool until he has stopped asking questions.