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This story was in an anthology in the 60's or 70's. It concluded that our universe is actually an experiment or incubator... Any thoughts which it was?

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Isaac Asimov's "Breeds There A Man...?"

Final lines:

Blaustein looked at the stars.

Incubators?

It was first published in Astounding, June 1951; you can read it online at archive.org.

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