The threat of man-made machines rising up against humanity sounds like the premise of a science fiction movie, but a group of academics in the UK are looking into the possibility that such a threat could become reality. A new research center at the University of Cambridge is examining extinction-level risks to humanity, from the rise of killer robots to nuclear war. Brooke speaks with Martin Rees, an astrophysics professor and co-founder of the Center for the Study of Existential Risk.

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