Although robots are getting better at adapting to the real world, they still tend to tackle challenges with a fixed set of alternatives that can quickly become impractical as objects (and more advanced robots) complicate the situation.

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People making things that require a little bit more training, things like advanced -- artificial heart valves or surgical robots.

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When the final round of the Urban Challenge begins Saturday morning, that field will have been whittled down to just 20 or so robots by the event's sponsor, the Defense Advanced Research Projects Agency (DARPA).

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Asimo (the name stands for "Advanced Step in Innovative Mobility") is a descendent of two previous robots: the P2, a prototype that first debuted in 1996, and the P3, which began to walk around Honda labs in 1997.

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As these robots have become more sophisticated, Captcha has had to become more advanced in order to stay effective.

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