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The original (and best) Robot stories are actually mostly detective stories where the 3 laws and the "robots" are kind of maguffins to setup the mystery or paradox to be solved. He went on to write good detective / mystery short stories (Black Widow series?) and I think had little intention of doing more SF. The Publisher badgered him.
"Asimov was interested in history. Starting in the 1960s, he wrote 14 popular history books."
I think he wrote little SF between about 1958 and 1981. 1982 Foundation' Edge was the result of Publisher pressure.
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