I am interested in how cells know what they are and how they should behave in their proper place in the body.

Winning a Nobel Prize isn't about being clever at all. It's about making... at least in physiology or medicine, it's about making discoveries, and you don't have to be clever to make a discovery, I don't think; it just comes up and punches you on the nose.

It's terribly important that you can criticise people's ideas without criticising them, and if they burst into tears, it means that you tend to hold back from getting at the absolute truth.

You don't want to inhibit cell division. You want to inhibit cell division in the cancer cells, and even that is not really where you want to do it. You actually want to destroy the cancer cells, which is a different matter altogether. Just stopping them isn't enough - you really want to kill them.

There's a perspective that I've gained as an astronaut that I didn't get from my science activities. In my science activities, I learned by the seat of my pants. Spending 17 years as an astronaut, I learned the NASA formalism of systems engineering as if my life depended on it. Literally.

The central task of science is to arrive, stage by stage, at a clearer comprehension of nature, but this does not at all mean, as it is sometimes claimed to mean, a search for mastery over nature.

I didn't need to write historical epics, no, or science fiction, though I read a lot of science fiction as a kid and rather liked it. But I didn't have the mentality.

I have a problem with telling jokes about physics. Quite often the audience have no idea what you are talking about and, to be honest, I don't know what I'm talking about either.