... What we call scientific knowledge today is a body of statements
of varying degrees of certainty. Some of them are most unsure; some of them
are nearly sure; but none is absolutely certain. Scientists are used to this.
We know that it is consistent to be able to live and not know. Some people say,
“How can you _live_ without knowing?” I do not know what they mean. I always
live without knowing. That is easy. How you get to know is what I want to know.
- Richard Feynman