Too busy to drive? Let the car take the wheel. PopSci recently went for a ride in the Chevy Boss, winner of the 2007 Darpa Urban Challenge. With tricked-out GPS, sonar, laser guidance and a stack of computers, this 2007 Chevy Tahoe SUV can navigate an urban setting, weave around obstacles, and even negotiate intersections with other cars. GM expects the technology to be affordable, and less obtrusive, in about a decade.

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When last we visited with the men and women, the boys and girls, the Red Teams and Blue Teams and Road Warriors of the DARPA Grand Challenge off-road robotics race, back in March, we signed off on a note of authentic ambivalence. The teams themselves were all over the map, from rehearsing victory speeches to praying they would pass the qualifying round and be allowed on to what was anticipated to be a 210-mile course from outside Los Angeles through the Mojave Desert to somewhere just west of Vegas.

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I was concerned, I'll now admit, that the all-new Hummer H2 would be a wannabe dressed in battle fatigues. And I had good reason: To keep the price only a notch or two above reasonable, the H2 is built on GM's full-size truck platform. Nothing wrong there, provided your aim is to build a Chevy Tahoe.

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