But, tough, I have fallen…flat before. You just get up and dust yourself off.

So Cambridge rejected me. Quite rightly, although at the time I thought it was a little churlish. So, I had to do it without any university training. ... and I began to realize that there were probably a lot more of these things, and that if you find these things, you get a position in the ladder which you can’t get to unless you have either got an education or something else. So by finding important things, you immediately get into the game, which you’d been excluded from otherwise.

It was like switching out the engines mid-flight. I remember the day we turned on this free service, had we probably gone on for about six more months, I think we might have died as a company. That was a defining moment and that was as late as 2013. I think every great company has at least three near-death experiences.

I had self doubts when I was a freshman in high school. I was 14 years old and not very mature, and there were a few incidents in my freshman year. I learned in a very competitive environment. The high school environment that I played in was very intense, and I learned how to be stoic and go out and compete.

Then I had another thought: Physics disgusts me a little bit now, but I used to enjoy doing physics.  Why did I enjoy it?  I used to play with it.  I used to do whatever I felt like doing—it didn’t have to do with whether it was important for the development of nuclear physics, but whether it was interesting and amusing for me to play with.

We'd walk in the canyons, and we'd often walk with Bethe, and Von Neumann, and Bacher. It was a great pleasure.

the colonel said I shouldn't tell them how the neutrons work and all the details because we want to keep things separate, so just tell them what to do to keep it safe.

For example, I was a little surprised when I was talking to a friend who was going to go on the radio. He does work on cosmology and astronomy, and he wondered how he would explain what the applications of this work were. "Well," I said, "there aren't any." He said, "Yes, but then we won't get support for more research of this kind." I think that's kind of dishonest. If you're representing yourself as a scientist, then you should explain to the layman what you're doing—and if they don't want to support you under those circumstances, then that's their decision.

I had nothing to do, so I start to figure out the motion of the rotating plate.  I discover that when the angle is very slight, the medallion rotates twice as fast as the wobble rate—two to one.  It came out of a complicated equation!  Then I thought, “Is there some way I can see in a more fundamental way, by looking at the forces or the dynamics, why it’s two to one?”

So I wish to you—I have no more time, 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. May I also give you one last bit of advice: Never say that you'll give a talk unless you know clearly what you're going to talk about and more or less what you're going to say.