Arun Venugopal fills in for Leonard.
Author H. Luke Schaefer explores the 1.5 million American households that struggle to survive on just $2.00 a day. Australian musician and satirist Tim Minchin discusses the 1000th performance of the Tony Award-winning 'Matilda The Musical.' John Norris tells us about the trailblazing journalist Mary McGrory. Annie Jacobsen takes us inside DARPA, the Defense Department's most secret and most controversial research agency.