The Public Radio International show "Open Source With Christopher Lydon" aired a discussion Monday on football's transformation from a running sport to a passing sport. The featured guests were author Michael Lewis, whose latest book "The Blind Side" talks about the development of the game, and Aaron Schatz, president and editor in chief of Football Outsiders and an NFL analyst for Fox Sports. You can listen to the show by clicking here and it's also available as a podcast. To get the podcast, you'll need to download and install iTunes. Thanks to Chelsea!