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# A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.<ref>{{cite book|last=Asimov|first=Isaac|title=I, Robot|date=1950}}</ref>
In [[The Evitable Conflict]] the machines generalize the First Law to mean:
Near the end of his book ''[[Foundation and Earth]]'', a zeroth law was introduced, with the original three suitably rewritten as subordinate to it:▼
# "No machine may harm humanity; or, through inaction, allow humanity to come to harm."
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:0. A robot may not injure humanity, or, by inaction, allow humanity to come to harm.
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