Science is a process for learning about nature in which competing ideas about how the world works are measured against observations.

In its efforts to learn as much as possible about nature, modern physics has found that certain things can never be "known" with certainty. Much of our knowledge must always remain uncertain. The most we can know is in terms of probabilities.

Phenomena complex-laws simple....Know what to leave out.

Experiment is the sole judge of the validity of any idea.

Some things that satisfy the rules of algebra can be interesting to mathematicians even though they don't always represent a real situation.

So I have just one wish for you – the good luck to be somewhere where you are free to maintain the kind of integrity I have described, and where you do not feel forced by a need to maintain your position in the organization, or financial support, or so on, to lose your integrity. May you have that freedom.

What Do You Care What Other People Think?