These machines are self-replicating and, as is found out through the course of the movie, they are quite intelligent and have managed to " evolve " into newer, more dangerous forms, most notably human forms which the real humans in the movie cannot tell apart from other real humans except by trial and error.

These machines are self-replicating and, as is found out through the course of the movie, they are quite intelligent and have managed to " evolve " into newer, more dangerous forms, most notably human forms which the real humans in the movie cannot tell apart from other real humans except by trial and error.

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