(Note: This interview originally aired last summer.) Our guest is the author and former journalist Rinker Buck, whose book, "Flight of Passage," was praised by The New Yorker as "a funny, cocky gem." Buck's latest book, which he talks with us about, is "The Oregon Trail: A New American Journey." In this bestselling work, the author and his brother travel the original trail -- over some 2,000 miles -- from St. Joseph, Missouri, to Baker City, Oregon. It's a journey made by mule-pulled wagon, no less -- like the pioneers did, a century ago -- and it lasts four months.