The next essay in which Asimov tells a personal anecdote doesn't come until 7 months later, with "Those Crazy Ideas" in the Jan 1960 F & SF.
"Time and time again I have been asked (and I'm sure others who have, in their time, written science fiction have been asked too): "Where do you get your crazy ideas?"
Over the years, my answers have sunk from flattered confusion to a shrug and a feeble smile. Actually, I don't really know, and the lack of knowledge doesn't really worry me, either, as long as the ideas keep coming.
But then some time ago, a consultant firm in Boston, engaged in a sophisticated space-age project for the government, got in touch with me.
What they needed, it seemed, to bring their project to a successful conclusion were novel suggestions, startling new principles, conceptual breakthroughs. To put it in a nutshell of a well-turned phrase, they need "crazy ideas."
Unfortunately, they didn't know how to go about getting crazy ideas, but some among them had read my science fiction, so they looked me up in the phone book and called me to ask (in essence), "Dr. Asimov, where do you get your crazy ideas?"
Alas, I still didn't know, but as speculation is my profession, I am perfectly willing to think about the matter and share my thoughts with you.
The question before the house, then, is: How does one go about creating or inventing or dreaming up or stumbling over a new and revolutionary scientific principle?"
He then goes on to give the history of a few such scientists who discovered these principles, like Charles Darwin and Louis Pasteur.