You have to have a lot of ideas. First, if you want to make discoveries, it’s a good thing to have good ideas.

You have to have a lot of ideas. First, if you want to make discoveries, it’s a good thing to have good ideas. And second, you have to have a sort of sixth sense — the result of judgment and experience — which ideas are worth following up. I seem to have the first thing, a lot of ideas, and I also seem to have good judgment as to which are the bad ideas that I should just ignore, and the good ones, that I’d better follow up.