Listen, I mean that from my knowledge of the world that I see around me, I think that it is much more likely that the reports of flying saucers are the results of the known irrational characteristics of terrestrial intelligence than of the unknown rational efforts of extra-terrestrial intelligence.

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."

What did you ASK at school today?

If you thought that science was certain - well, that is just an error on your part.

If you know that you are not sure, you have a chance to improve the situation. I want to demand this freedom for future generations.

In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.

A very great deal more truth can become known than can be proven.