There are 10^11 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.

When you get as old as I am, you start to realize that you've told most of the good stuff you know to other people anyway.

Science is a way to teach how something gets to be known, what is not known, to what extent things are known (for nothing is known absolutely), how to handle doubt and uncertainty, what the rules of evidence are, how to think about things so that judgments can be made, how to distinguish truth from fraud, and from show.

There's plenty of room at the bottom.

Don't think about what you want to be, but what you want to do. Keep up some kind of a minimum with other things so that society doesn't stop you from doing anything at all.

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

The first principle is that you must not fool yourself and you are the easiest person to fool.