Because you’re such a good salesman, and if you go work for a company, they’re going to use you as a salesman. If you’re going to be a salesman, you might as well be selling something worthwhile, like education

Believe nothing a man tells you and everything he shows you

When you do the right thing, good stuff has a way of happening.

My colleague told me: "It took a long time, but I finally figured it out. When it comes to men who are romantically interested in you, it's really simple. Just ignore everything they say and only pay attention to what they do.

I don't suffer from an abundance of politeness.

It is not the things we do in life that we regret on our death bed. It is the things we do not.

I understand the arguments about how the billions of dollars spent to put men on the moon could have been used to fight poverty and hunger on Earth. But, look, I'm a scientist who sees inspiration as the ultimate tool for doing good. When you use money to fight poverty, it can be of great value, but too often, you're working at the margins. When you're putting people on the moon, you're inspiring all of us to achieve the maximum of human potential, which is how our greatest problems will eventually be solved. Give yourself permission to dream.