Andy Borowitz fills in for Leonard. He talks to Michael Lewis about the world of flash trading on Wall Street. Singer, songwriter, and former First Lady of France Carla Bruni discusses her latest album, “Little French Songs.” Music critic and reporter Joel Selvin on the little-known story of rhythm and blues songwriter and record producer Bert Berns. A mother talks about raising a deaf son and what she learned about the science of hearing. Julene Bair talks about trying to preserve her family’s Kansas farm to pass on to future generations.