I then converted a bathroom, seldom used by the family, into a laboratory and spent hours playing with chemistry sets. With the help of an aunt, Esther Molina, who was a chemist, I continued with more challenging experiments along the lines of those carried out by freshman chemistry students in college.

I would end every night reading these ten letters. It made the numbers and the policies very concrete and very specific. And I was reminded that the choices we were making were affecting millions of people. I found that to be very useful.

I, at first, thought I didn’t have a ritual, but then I remembered that I always get up and make a cup of coffee while it is still dark—it must be dark—and then I drink the coffee and watch the light come. And she said, “Well, that’s a ritual.” And I realized that for me this ritual comprises my preparation to enter a space that I can only call nonsecular … For me, light is the signal in the transition. It’s not being in the light, it’s being there before it arrives. It enables me, in some sense.

They’re very quiet coffee shops, and there are some positions in which it’s easier to write. Somewhere there’s an outlet, and you can keep your back to people. I’ll write for about two hours and then get up and walk with my iPad to the next coffee shop, about 10 minutes away. When you walk, you get a little fresh air, and I’ve heard moving around is good for you while writing. When you write in an office or at home, you end up sleeping. You can’t sleep at a cafe since you can’t lie down. I think that’s good, and it’s become a habit. I wrote Parasite half in Seoul and half in Vancouver.

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.

It was a brilliant idea: You have no responsibility to live up to what other people think you ought to accomplish.  I have no responsibility to be like they expect me to be.

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.

I would like to add something that’s not essential to the science, but something I kind of believe, which is that you should not fool the layman when you’re talking as a scientist.

Nothing happens because there’s not enough real activity and challenge: You’re not in contact with the experimental guys.  You don’t have to think how to answer questions from the students.  Nothing!

The questions of the students are often the source of new research.  They often ask profound questions that I’ve thought about at times and then given up on, so to speak, for a while.  It wouldn’t do me any harm to think about them again and see if I can go any further now.  The students may not be able to see the thing I want to answer, or the subtleties I want to think about, but they remind me of a problem by asking questions in the neighborhood of that problem.  It’s not so easy to remind yourself of these things.