You should command and demand the tenfold leverage on your dollars when you give it away as well.

My father, who grew up picking olives on the Greek island of Lesbos, was a doctor. So my family expected me to become a physician.

An expert is someone who can tell you exactly how it can't be done.

You could not legally put a human and fly them into space. In fact, you couldn't bring a spaceship back. All those spaceships we were sending commercially into space were one way. You sort of like, got rid of them. And most passengers, who go up, do want to come back down.

More than ever before in history, individuals can now band together to solve grand challenges. We face enormous problems, but we 'as individuals' have enormous power to solve them.

Small teams driven by their passion with a clear focus can do extraordinary things. Things that only large corporations and governments could do in the past.

I believed that once we got to the Moon, there was no stopping us. But in fact, we did stop.