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Alien Probes Could Already Lurk in Our Solar System, Study Says
In 1949, famed mathematician and physicist John von Neumann delivered a series of addresses at the University of Illinois, where he introduced the concept of "universal constructor." The theory was further detailed in the 1966 book, Theory of Self-Reproducing Automata, a collection of von Neumann's writings compiled and completed by a colleague after his death.
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