39 - 5The Fabric of the Cosmos: What is Space? Nov. 02, 2011
39 - 6The Fabric of the Cosmos: The Illusion of Time Nov. 09, 2011
39 - 7The Fabric of the Cosmos: Quantum Leap Nov. 16, 2011
39 - 8The Fabric of the Cosmos: Universe or Multiverse? Nov. 23, 2011
39 - 9Deadliest Volcanoes Jan. 04, 2012
39 - 12Mystery of a Masterpiece Jan. 25, 2012
39 - 17Deadliest Tornadoes Apr. 11, 2012
39 - 19Secrets of the Sun Apr. 25, 2012