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Paddling past a limestone spire on Lake Ontario, August 26, 1976. The canoe at the front contains Rich Gross, Bob Kulick, Reid Lewis, and John DiFulvio. (Photographers of the La Salle: Expedition II).

In 1976, a 37-year-old suburban French teacher led an eight-month trek retracing the 17th century expedition of French explorer Robert de La Salle. Hear about the trip from two who experienced it, including the teacher who led the exhibition, and the author of a new book about the trip.

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Bethany McLean (Third Way Think Tank / Flickr)

Chicago-based business writer Bethany McLean makes the case that mortgage giants Fannie Mae and Freddie Mac are in a precarious state in her new book, "Shaky Ground: The Strange Saga of the U.S. Mortgage Giants." She'll explain what failure could mean for American mortgage holders when she joins us Monday on "Chicago Tonight."