Slideshow: Now That's Quite a Challenge

Competitors in this weekend's Darpa Grand Challenge will try to do what the Pentagon's brightest minds have never done: Get a robot to drive itself across the desert for more than 200 miles. Noah Shachtman reports from Ontario, California.
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A member of Team TerraMax, one of 25 teams accepted to compete, is uncertain if anyone will finish the Darpa Challenge on the first attempt.

See related story: Now That's Quite a Challenge

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Despite their armor, the robotic Darpa drones are not invincible. Even Sandstorm -- the Carnegie Mellon University multimillion-dollar, pilotless Humvee that's the envy of most of the other teams here -- limped to the track after a near-death experience just a few days ago.
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Team Phantasm, the first squad scheduled for qualification and inspection by Darpa officers Monday, had a sensor breakdown and missed its chance to qualify. The team will have another chance Tuesday.
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A.I. Motorvator, a handcrafted, wedge-shaped drone, has had its share of false starts.