Asimov's positronic robots aren't allowed to create offspring. This is actually a consequence of the Three Laws: Were robots to reproduce, there would inevitably be variations among them; this would make them subject to Darwinian natural selection. Eventually this would result in robots having removed or bypassed the Three Laws, hence being dedicated to ...
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For the past several years the name of Isaac Asimov has meant
top-drawer fast-action stories to the readers of science-fiction
magazines. Dr. Asimov's interest in the imaginative challenge of
science fiction was established at a very early age when his father,
anxious to protect the lad's impressionable ...