Biggest Threat We're Ignoring: Machines

For decades, futurists have worried about computers getting human intelligence. Dystopian films from Stanley Kubrick’s “2001: A Space Odyssey” to the “Terminator” and “Matrix” movies showed smart machines wreaking havoc on humans.

Now serious thinkers have sounded the alarm about artificial intelligence, while robotics and automation already have caused profound social and economic dislocation.