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As anyone who is familiar with the Isaac Asimov's Robots in Time series by William F. Wu is already aware, the Mojave Center Governor does not realize that sending his component parts backwards through time results in nuclear explosions and thus erasing them from history. Once the human/robot team is created to travel back in time to to retrieve the components, how does this not introduce a grandfather paradox such that the components would never have existed in that time period once they are collected?

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    How would that cause them never to have existed? They retrieve the components after they arrive. The personal timeline of the components and the team is still linear; it never crosses over itself, as far as I can remember. – SaintWacko Sep 20 '12 at 13:47

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