Driverless cars

Stepping into a car that could drive you anywhere while you sit there and read a newspaper or take a nap? Sounds like the stuff of science fiction, and--in fact--it has been in numerous sci-fi works. In movie form it's been seen more recently in 1993's "Demolition Man" and 2004's "I, Robot."

Now we have Google testing out its own driverless car systems the company hopes will cut down on accidents and improve efficiency. That testing follows the path of the Defense Advanced Research Projects Agency challenges, which pit driverless cars against one another to get from point A to point B. And before that, the idea was pitched by General Motors at the 1939 World's Fair using radio signals to tell cars where to go.

Seen here is Will Smith's Audi of the future, from "I, Robot" switching from autopilot to manual override mode.