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We get a science lesson with ...

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We get a science lesson with Chicago teachers at zero-gravity. We talk with young entrepreneur Rodney Walker, a freshman at Morehouse College and a finalist in the National Foundation for Teaching Entrepreneurship's national championship. Tony Arnold reports on the expensive race for Illinois's 14th congressional district, where the Democratic winner of a special election to replace former House Speaker Dennis Hastert is hoping to hold onto his seat. Plus, the Chicago Symphony Orchestra takes us on a musical journey along the Inca Trail.

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