Story summary.Story is narrated by a ... robot or AI or something. Humans have built machines that can build better versions of themselves. But they still serve man.
That's when earth gets attacked by a huge alien armada - but aliens without self-improving machines. So these machines go into superfast evolution as defense. In the end, all humans will be dead before the machines can build something way beyond aliens' capability & throw them out.
So now these machines have inherited earth.
Fact sheet.First published: Amazing Stories, August 1932.
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Related: Stories of John Campbell.