The polio virus still circulates in certain parts of the world, and if it comes to the United States, where a significant percentage of the population is unvaccinated, the disease could make a comeback. Historian David Oshinsky remembers the toll it took on his childhood in the 1950s, when polio was a major public health threat. Meanwhile, investigative journalist Seymour Hirsch has spent his career exposing wrongdoing and protecting his sources, and actress Rose Byrne has come a long way from her early days as a struggling actor in Hollywood. In other news, a new book by Nora O'Donnell tells the stories of women who helped shape American history, including Dr. Mary Edwards Walker, the only woman to receive the Medal of Honor, and Constance Baker Motley, the first black woman to argue in front of the Supreme Court.
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