Bob Edwards Weekend: former astronaut Sally Ride; journalist Michael Walsh; Dan Gediman of This I Believe, Inc.

  As the first American woman in space, SALLY RIDE inspired a generation of young girls to get interested in science. In 2001, she founded Sally Ride Science, a company that creates entertaining science programs and books for kids, with a particular focus on girls. Ride's latest books -- "Mission: Planet Earth" and "Mission: Save the Planet" -- teach kids about global warming and how to become responsible energy consumers. In 2007, Russian President Vladimir Putin named American-born George Koval a Hero of the Russian Federation. Putin revealed that Koval, who worked at the U.S. military research center in Oak Ridge, Tennessee, passed along nuclear secrets to the Soviet Union. Journalist MICHAEL WALSH writes about George Koval for Smithsonian Magazine's May edition in the article "Iowa-Born, Soviet-Trained." We continue airing classic audio essays from the original THIS I BELIEVE series. This weekend, Bob talks with This I Believe, Inc. executive director DAN GEDIMAN about the essay from Edward R. Murrow, who hosted the original series from 1951 to 1955. The newsman gained acclaim for his CBS Radio broadcasts during World War II. Later, his television series tackled subjects ranging from Joseph McCarthy to farm worker rights. In his essay, Murrow describes the fear and uncertainty Americans felt in the early 1950s.