Nightfall is justly famous, and recognised as one of the best short stories ever penned, and very much a pinicle of Asimovs impressive output.

It is interesting partly for being based on a discussion between editor (John W Campbell) and author based on no more than a quote from a poem by Emerson. That's all it takes. A simple quote taken and examined.

It's also interesting for being written when he was only 21. Did he "peak" then? I think not - his legacy stretches far beyond Nightfall, and to my mind his Laws of Robotics have a bigger impact on society, especially now.

But the story is remarkable for being unique, memorable, and self-complete. Yes, he expanded on the idea in 1990, but the story didn't need it, it was perfect as was.

Rest well, Good Doctor.