Foundation Universe
This story is set within Asimov's Foundation universe, which also includes his earlier Susan Calvin positronic robot tales. It is clearly set a number of centuries prior to the events of his novelette "Mother Earth" and the novel The Caves of Steel, during a period in which the Spacer worlds have yet to turn against the people of the Earth, and in which the U.S. Robots corporation is still active.
Read more about this topic: The Positronic Man
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