Elizabeth Fiedler reports from a South Philadelphia neighborhood where a home explosion earlier today caused eight injuries and damage to three homes. Emma Jacobs has the story on Montana Senator Max Baucus and Michigan Representative Dave Camp–two legislators who want to rewrite the U.S. tax code. Guest Host Dave Davies talks with Daily News columnist John Baer on the death of former Pennsylvania Governor William Scranton. Guest commentator Marybeth Hagan discusses how she arrived at her conservative principles. Franklin Institute Chief Astronomer Derrick Pitts joins Dave Heller for this week’s edition of SkyTalk. Peter Crimmins visits the Kimmel Center where auditions for the legendary New York City Apollo Theater took place this past weekend.