Watson, a computer designed over the course of four years, costing hundreds of millions of dollars, will be one of the three contestants on "Jeopardy!" next week. The IBM machine is designed to decipher English-language clues and then search more than half-million books for the answer; and it does it all under three seconds.   

If successful, scientists think it could have real-world benefits.

We talk with  Michael Bicks  producer and director of the new NOVA documentary, "Smartest Machine on Earth,"  which airs on PBS at 10pm on Wednesday night.

We also talk with  Rodney Brooks, the former director of the MIT Computer Science and Artificial Intelligence Laboratory and an emeritus professor of robotics.

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