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And Iowa shifts its spot on the presidential nominating calendar.

effectively trapped or very hampered in their ability to get around the world. >> reporter: they're potentially energy and time-saving, letting people get things done. >> that's the essence, i understand, of google, being able to imagine what isn't and bringing it to reality. so today we're looking at science fiction becoming tomorrow's reality. the self-driving car. >> reporter: but even before it gets the green light, a question was asked about tickets and running red lights. >> self-driving cars do not run red lights. >> reporter: and how about this? people are talking about googl...