Will the U.S. Have a Droid Army?

The U.S. military may be 30 percent robotic by the year 2020, according to Doug Few and Bill Smart of Washington University in St. Louis.

"When the military says 'robot' they mean everything from self-driving trucks up to what you would conventionally think of as a robot. You would more accurately call them autonomous systems rather than robots," says Smart, assistant professor of computer science and engineering.

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Bill Christensen catalogues the inventions, technology and ideas of science fiction writers at his website, Technovelgy. He is a contributor to Live Science.