Below is a list of the guests from episodes that were first aired or last repeated in 2012. To listen, click on the episode title to go to that episode’s page.
| Name | Discipline/Profession | Episode Title | Episode Date | Last Aired |
|---|---|---|---|---|
| Kathy Abbott | Aeronautics/Space | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Paul Abell | Planetary Science | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| John Adam | Mathematics | Do the Math | 7/16/2012 | 3/24/2014 |
| Rhett Allain | Physics | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Anil Ananthaswamy | Journalism/Technical Writing | Catch a Wave | 3/19/2012 | 9/2/2013 |
| Anil Ananthaswamy | Journalism/Technical Writing | [Rectangular Container] Thinking | 5/23/2011 | 10/8/2012 |
| William Anders | Aeronautics/Space | Seth’s Storm Shelter | 6/25/2012 | 6/25/2012 |
| Michael Anderson | Neuroscience | Do the Math | 7/16/2012 | 3/24/2014 |
| Matt Andrews | Biology | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Jacopo Annese | Neuroscience | Remembers Only | 5/30/2011 | 12/24/2012 |
| Peter Aughton | Astronomy | Mass Transits | 5/28/2012 | 5/28/2012 |
| Robert Bartholomew | Sociology | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
| John Beggs | Physics | That’s So Random! | 1/10/2011 | 5/14/2012 |
| James Bennighof | Music | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| David Blake | Planetary Science | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Paul Bloom | Psychology | Aware Am I? | 11/1/2010 | 2/13/2012 |
| Christoper Boehm | Anthropology | Animal Instinct | 7/9/2012 | 12/30/2013 |
| Kathleen Bogart | Psychology | Second That Emotion | 4/9/2012 | 4/9/2012 |
| Mike Borg | Entertainment | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Andre Bormanis | Author | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Andre Bormanis | Author | Skeptic Check: Follywood Science | 7/30/2012 | 9/9/2013 |
| Kathryn Bowers | Author | Animal Instinct | 7/9/2012 | 12/30/2013 |
| Jeannette Elizabeth Brown | Chemistry | Material Whirl | 1/30/2012 | 7/8/2013 |
| Kelly Brownell | Psychology | Olympics for the Rest of Us | 7/23/2012 | 7/23/2012 |
| Jane Brox | Author | Light, the Universe, and Everything | 9/6/2010 | 1/2/2012 |
| Martin Bucknavage | Health/Medicine | No Expiration Date | 6/13/2011 | 11/19/2012 |
| Thomas Bullard | Humanities | Skeptic Check: Saucer’s Apprentice | 11/15/2010 | 2/20/2012 |
| Aaron Burton | Astrobiology | To Earth and Back | 5/21/2012 | 5/21/2012 |
| Atul Butte | Planetary Science | Big Data | 9/24/2012 | 9/24/2012 |
| Susan Cain | Author | Group Think | 4/30/2012 | 12/23/2013 |
| Ken Caldeira | Earth Sciences/Ecology/Climate Change | Doomsday Live, Part 2 | 12/3/2012 | 12/3/2012 |
| Ken Caldeira | Earth Sciences/Ecology/Climate Change | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Dick Carrigan | Physics | Gene Hack, Man | 12/10/2012 | 2/10/2014 |
| Sean Carroll | Cosmology | Light, the Universe, and Everything | 9/6/2010 | 1/2/2012 |
| Sean Carroll | Cosmology | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Sean Carroll | Cosmology | As You Were | 10/29/2012 | 9/22/2014 |
| Michelle Chang | Chemistry | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| Jon Chase | Biology | That’s So Random! | 1/10/2011 | 5/14/2012 |
| Marcus Chown | Journalism/Technical Writing | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Brian Christian | Author | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Susan Clancy | Psychology | Skeptic Check: Saucer’s Apprentice | 11/15/2010 | 2/20/2012 |
| Gregory Cochran | Physics | Life Back Then | 4/2/2012 | 11/4/2013 |
| Joel Cohen | Mathematics | Early Adapters | 12/6/2010 | 4/23/2012 |
| Catharine Conley | Aeronautics/Space | To Earth and Back | 5/21/2012 | 5/21/2012 |
| Alana Connor | Industry | Better Mousetrap | 2/7/2011 | 6/4/2012 |
| Jonathan Coulton | Music | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Robert Courland | Author | Material Whirl | 1/30/2012 | 7/8/2013 |
| C. C. Culver | Aeronautics/Space | Getting a Spacelift | 2/6/2012 | 7/15/2013 |
| John Cumbers | Biology | Skeptic Check: OMG, GMO? | 6/18/2012 | 6/18/2012 |
| Paul Davies | Futurist | To Earth and Back | 5/21/2012 | 5/21/2012 |
| David DeGusta | Anthropology | Early Adapters | 12/6/2010 | 4/23/2012 |
| Joseph DeSimone | Chemistry | Nano Nano | 2/21/2011 | 7/2/2012 |
| Dickson Despommier | Health/Medicine | Early Adapters | 12/6/2010 | 4/23/2012 |
| Kevin Devlin | Mathematics | Do the Math | 7/16/2012 | 3/24/2014 |
| Sylvia Earle | Earth Sciences/Ecology/Climate Change | Group Think | 4/30/2012 | 12/23/2013 |
| Paul Ekman | Psychology | Second That Emotion | 4/9/2012 | 4/9/2012 |
| Chris Feldman | Biology | Seth’s Cabinet of Wonders | 3/12/2012 | 3/12/2012 |
| Alex Filippenko | Astronomy | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Peter Fisher | Physics | Light, the Universe, and Everything | 9/6/2010 | 1/2/2012 |
| Bill Flounders | Technology | Nano Nano | 2/21/2011 | 7/2/2012 |
| Joshua Foer | Author | Remembers Only | 5/30/2011 | 12/24/2012 |
| Chris Ford | Entertainment | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Andrew Fraknoi | Astronomy | Doomsday Live, Part I | 11/26/2012 | 11/26/2012 |
| Susan Freinkel | Author | No Expiration Date | 6/13/2011 | 11/19/2012 |
| Christopher French | Psychology | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Gordon Gauchat | Sociology | Group Think | 4/30/2012 | 12/23/2013 |
| Michael Gazzaniga | Neuroscience | Wired for Thought | 1/16/2012 | 1/16/2012 |
| James Geary | Author | [Rectangular Container] Thinking | 5/23/2011 | 10/8/2012 |
| Asif Ghazanfar | Neuroscience | Animal Instinct | 7/9/2012 | 12/30/2013 |
| William Gibson | Author | Early Adapters | 12/6/2010 | 4/23/2012 |
| Kirsten Gilardi | Health/Medicine | Doomsday Live, Part 2 | 12/3/2012 | 12/3/2012 |
| Jim Giovannoni | Biology | Gene Hack, Man | 12/10/2012 | 2/10/2014 |
| Penny Glass | Health/Medicine | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Ken Goldberg | Engineering | Big Data | 9/24/2012 | 9/24/2012 |
| Mike Goodchild | Geography | Found in Space | 11/8/2010 | 3/26/2012 |
| Deborah Gordon | Biology | That’s So Random! | 1/10/2011 | 5/14/2012 |
| Alice Gorman | History | Space Archaeology | 6/6/2011 | 10/22/2012 |
| Jonathan Gottschall | Author | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Michael Gould | Health/Medicine | Oh, Rats! | 9/10/2012 | 9/10/2012 |
| Brian Greene | Physics | Cosmos: It’s Big, It’s Weird | 1/9/2012 | 6/3/2013 |
| David Grinspoon | Astrobiology | Mass Transits | 5/28/2012 | 5/28/2012 |
| Wayne Grody | Health/Medicine | Skeptic Check: Follywood Science | 7/30/2012 | 9/9/2013 |
| John Grotzinger | Geology | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Leonard Guarente | Biology | No Expiration Date | 6/13/2011 | 11/19/2012 |
| Doug Gurian-Sherman | Biology | Skeptic Check: OMG, GMO? | 6/18/2012 | 6/18/2012 |
| David Guston | Futurist | Nano Nano | 2/21/2011 | 7/2/2012 |
| Kristian Hammond | Industry | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Robin Hanson | Economics | Space Archaeology | 6/6/2011 | 10/22/2012 |
| Gerry Harp | Physics | Big Data | 9/24/2012 | 9/24/2012 |
| Rachel Harris | Astrobiology | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Guy P. Harrison | Author | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Guy P. Harrison | Author | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Guy P. Harrison | Author | Doomsday Live, Part I | 11/26/2012 | 11/26/2012 |
| Guy P. Harrison | Author | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Michael Hartl | Physics | [Rectangular Container] Thinking | 5/23/2011 | 10/8/2012 |
| Alexander Hayes | Planetary Science | Rife with Life | 2/27/2012 | 7/22/2013 |
| Jennifer Heldmann | Aeronautics/Space | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Ben Hellwarth | Author | Seth’s Cabinet of Wonders | 3/12/2012 | 3/12/2012 |
| Don Henderson | Biology | Life Back Then | 4/2/2012 | 11/4/2013 |
| Rachel Herz | Psychology | Second That Emotion | 4/9/2012 | 4/9/2012 |
| Andrew Hessel | Futurist | Gene Hack, Man | 12/10/2012 | 2/10/2014 |
| Martin Hilbert | Economics | Remembers Only | 5/30/2011 | 12/24/2012 |
| Rick Hochberg | Biology | No Expiration Date | 6/13/2011 | 11/19/2012 |
| Tori Hoehler | Astrobiology | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Richard Hollingham | Journalism/Technical Writing | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| Mako Igarashi | Other | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Pico Iyer | Author | Oh, Rats! | 9/10/2012 | 9/10/2012 |
| Pico Iyer | Author | As You Were | 10/29/2012 | 9/22/2014 |
| Jean Paul Jacob | Computer Science | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Jon Jenkins | Aeronautics/Space | Mass Transits | 5/28/2012 | 5/28/2012 |
| Alok Jha | Journalism/Technical Writing | Going Global | 11/5/2012 | 11/5/2012 |
| Lonnie Johnson | Industry | Better Mousetrap | 2/7/2011 | 6/4/2012 |
| Steven Johnson | Author | Better Mousetrap | 2/7/2011 | 6/4/2012 |
| Tom Jones | Aeronautics/Space | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Dan Kaminsky | Industry | Gene Hack, Man | 12/10/2012 | 2/10/2014 |
| Lucas Kavner | Journalism/Technical Writing | Skeptic Check: Follywood Science | 7/30/2012 | 9/9/2013 |
| Leslie Kean | Journalism/Technical Writing | Skeptic Check: Saucer’s Apprentice | 11/15/2010 | 2/20/2012 |
| Kevin Kelly | Journalism/Technical Writing | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Madhu Khanna | Economics | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| David Kirby | Journalism/Technical Writing | Skeptic Check: Follywood Science | 7/30/2012 | 9/9/2013 |
| Debbie Kolyer | Other | To Earth and Back | 5/21/2012 | 5/21/2012 |
| Dennis Kucinich | Law | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
| Michael LaBarbera | Biology | Nano Nano | 2/21/2011 | 7/2/2012 |
| Kelly Lambert | Neuroscience | Oh, Rats! | 9/10/2012 | 9/10/2012 |
| Bas Lansdorp | Industry | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Albert Lazzarini | Physics | Catch a Wave | 3/19/2012 | 9/2/2013 |
| Jonah Lehrer | Author | Seth’s Storm Shelter | 6/25/2012 | 6/25/2012 |
| Jonah Lehrer | Author | Second That Emotion | 4/9/2012 | 4/9/2012 |
| Daniel Lieberman | Evolutionary Sciences | Olympics for the Rest of Us | 7/23/2012 | 7/23/2012 |
| Henry Lieberman | Journalism/Technical Writing | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Rob Lillis | Physics | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Rob Lillis | Physics | Rife with Life | 2/27/2012 | 7/22/2013 |
| Andrei Linde | Physics | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Ronald Lindsay | Sociology | Skeptic Check: OMG, GMO? | 6/18/2012 | 6/18/2012 |
| Darren Lipomi | Chemistry | Material Whirl | 1/30/2012 | 7/8/2013 |
| Hod Lipson | Robotics/IA | Seth’s Cabinet of Wonders | 3/12/2012 | 3/12/2012 |
| Mario Livio | Astronomy | Found in Space | 11/8/2010 | 3/26/2012 |
| William Bryant Logan | Author | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Nick Lomb | Astronomy | Mass Transits | 5/28/2012 | 5/28/2012 |
| Stephen Long | Biology | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| Gina Luciano | Industry | Going Global | 11/5/2012 | 11/5/2012 |
| Stephen Macknik | Neuroscience | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Michael S. Malone | Journalism/Technical Writing | As You Were | 10/29/2012 | 9/22/2014 |
| Lori Marino | Evolutionary Sciences | That’s So Random! | 1/10/2011 | 5/14/2012 |
| Alan Marscher | Astronomy | Catch a Wave | 3/19/2012 | 9/2/2013 |
| Susana Martinez-Conde | Neuroscience | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Max Marty | Industry | Going Global | 11/5/2012 | 11/5/2012 |
| Rachel Mastrapa | Planetary Science | Rife with Life | 2/27/2012 | 7/22/2013 |
| Barry Matsumori | Industry | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| Christopher McKay | Planetary Science | To Earth and Back | 5/21/2012 | 5/21/2012 |
| Jerry Meehl | Earth Sciences/Ecology/Climate Change | Going Global | 11/5/2012 | 11/5/2012 |
| Cynthia Meyersburg | Psychology | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Marc Millis | Physics | Getting a Spacelift | 2/6/2012 | 7/15/2013 |
| Leonard Mlodinow | Physics | That’s So Random! | 1/10/2011 | 5/14/2012 |
| Mark Moffett | Biology | Seth’s Storm Shelter | 6/25/2012 | 6/25/2012 |
| Mark Moffett | Biology | Can We Talk? | 6/11/2012 | 1/6/2014 |
| John Monahan | Author | [Rectangular Container] Thinking | 5/23/2011 | 10/8/2012 |
| Tiffany Montague | Engineering | Space Archaeology | 6/6/2011 | 10/22/2012 |
| Luke Muehlhauser | Robotics/IA | Doomsday Live, Part 2 | 12/3/2012 | 12/3/2012 |
| Deirdre Mullligan | Law | Big Data | 9/24/2012 | 9/24/2012 |
| Clare Murphy | Art | Can We Talk? | 6/11/2012 | 1/6/2014 |
| Monica Murphy | Biology | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Joshua Muscat | Health/Medicine | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
| Clifford Nass | Psychology | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Barbara Natteson-Horowitz | Health/Medicine | Animal Instinct | 7/9/2012 | 12/30/2013 |
| Julie Neiworth | Psychology | Aware Am I? | 11/1/2010 | 2/13/2012 |
| Karen Nelson | Biology | Big Data | 9/24/2012 | 9/24/2012 |
| Joe Nickell | Sociology | Seth’s Storm Shelter | 6/25/2012 | 6/25/2012 |
| Joe Nickell | Sociology | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Margaret Noori | Humanities | Can We Talk? | 6/11/2012 | 1/6/2014 |
| Lorna O’Brien | Evolutionary Sciences | Life Back Then | 4/2/2012 | 11/4/2013 |
| Richard Obousy | Physics | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| Dennis Overbye | Journalism/Technical Writing | Cosmos: It’s Big, It’s Weird | 1/9/2012 | 6/3/2013 |
| Mark Pagel | Evolutionary Sciences | Can We Talk? | 6/11/2012 | 1/6/2014 |
| Jaak Panksepp | Neuroscience | Oh, Rats! | 9/10/2012 | 9/10/2012 |
| Jay Pasachoff | Astronomy | Mass Transits | 5/28/2012 | 5/28/2012 |
| Robert Peaslee | Sociology | Olympics for the Rest of Us | 7/23/2012 | 7/23/2012 |
| Michael Peled | Entertainment | Skeptic Check: OMG, GMO? | 6/18/2012 | 6/18/2012 |
| Roger Penrose | Cosmology | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Cynthia Phillips | Planetary Science | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| Cynthia Phillips | Planetary Science | Rife with Life | 2/27/2012 | 7/22/2013 |
| Phil Plait | Astronomy | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Phil Plait | Astronomy | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Phil Plait | Astronomy | Skeptic Check: Saucer’s Apprentice | 11/15/2010 | 2/20/2012 |
| Phil Plait | Astronomy | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Phil Plait | Astronomy | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Phil Plait | Astronomy | Skeptic Check: Forget with the Program | 5/7/2012 | 4/15/2013 |
| David Quammen | Journalism/Technical Writing | Going Global | 11/5/2012 | 11/5/2012 |
| Ben Radford | Sociology | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
| Ben Radford | Sociology | Skeptic Check: Saucer’s Apprentice | 11/15/2010 | 2/20/2012 |
| V. S. Ramachandran | Neuroscience | Can We Talk? | 6/11/2012 | 1/6/2014 |
| Jan Rayaey | Engineering | Wired for Thought | 1/16/2012 | 1/16/2012 |
| David Redish | Neuroscience | Found in Space | 11/8/2010 | 3/26/2012 |
| Ronald Reinstein | Journalism/Technical Writing | Skeptic Check: Forget with the Program | 5/7/2012 | 4/15/2013 |
| David Reitze | Physics | Catch a Wave | 3/19/2012 | 9/2/2013 |
| Pamela Ronald | Genetics/Genomics | Skeptic Check: OMG, GMO? | 6/18/2012 | 6/18/2012 |
| Alexander Rose | Futurist | No Expiration Date | 6/13/2011 | 11/19/2012 |
| Christopher Rose | Engineering | Space Archaeology | 6/6/2011 | 10/22/2012 |
| Callum Ross | Biology | Olympics for the Rest of Us | 7/23/2012 | 7/23/2012 |
| Mark Roth | Biology | Skeptic Check: They’re Baack! | 6/27/2011 | 12/31/2012 |
| Oliver Ryder | Genetics/Genomics | As You Were | 10/29/2012 | 9/22/2014 |
| Rafe Sagarin | Earth Sciences/Ecology/Climate Change | Animal Instinct | 7/9/2012 | 12/30/2013 |
| Valorie Salimpoor | Neuroscience | Skeptic Check: Monsters, Magic, and Music | 3/21/2011 | 8/27/2012 |
| Shankar Sastry | Engineering | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Keith Sawyer | Psychology | Group Think | 4/30/2012 | 12/23/2013 |
| Robert J. Sawyer | Author | Seth’s Cabinet of Wonders | 3/12/2012 | 3/12/2012 |
| Robert J. Sawyer | Author | Rife with Life | 2/27/2012 | 7/22/2013 |
| Linda Schadler | Engineering | Material Whirl | 1/30/2012 | 7/8/2013 |
| Todd Schlenke | Biology | Life Back Then | 4/2/2012 | 11/4/2013 |
| Stuart Schlisserman | Health/Medicine | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Britney Schmidt | Earth Sciences/Ecology/Climate Change | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| Ivan Schwab | Health/Medicine | Life Back Then | 4/2/2012 | 11/4/2013 |
| Jim Shapiro | Genetics/Genomics | Aware Am I? | 11/1/2010 | 2/13/2012 |
| Horst Simon | Computer Science | A. I. Caramba! | 3/28/2011 | 8/20/2012 |
| Gordy Slack | Journalism/Technical Writing | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
| Gordy Slack | Journalism/Technical Writing | Second That Emotion | 4/9/2012 | 4/9/2012 |
| Larry Smarr | Computer Science | Big Data | 9/24/2012 | 9/24/2012 |
| Michael E. Smith | Chemistry | As You Were | 10/29/2012 | 9/22/2014 |
| Robert Smith? | Mathematics | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Betsy Sparrow | Psychology | Skeptic Check: Forget with the Program | 5/7/2012 | 4/15/2013 |
| John Spencer | Planetary Science | Seth’s Storm Shelter | 6/25/2012 | 6/25/2012 |
| Larry Squire | Psychology | Remembers Only | 5/30/2011 | 12/24/2012 |
| Craig Stark | Neuroscience | Skeptic Check: Forget with the Program | 5/7/2012 | 4/15/2013 |
| Simon Steel | Astronomy | Before the Big Bang | 12/17/2012 | 2/24/2014 |
| Simon Steel | Astronomy | Cosmos: It’s Big, It’s Weird | 1/9/2012 | 6/3/2013 |
| Ian Stewart | Mathematics | Do the Math | 7/16/2012 | 3/24/2014 |
| Ed Stone | Physics | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Nathan J. Strange | Aeronautics/Space | Getting a Spacelift | 2/6/2012 | 7/15/2013 |
| Bret Stroegn | Biology | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| Leonard Susskind | Physics | Light, the Universe, and Everything | 9/6/2010 | 1/2/2012 |
| Peter Swan | Aeronautics/Space | As the Worlds Turn | 10/15/2012 | 10/15/2012 |
| Joseph Tainter | Earth Sciences/Ecology/Climate Change | Group Think | 4/30/2012 | 12/23/2013 |
| Harvey Tananbaum | Astronomy | Catch a Wave | 3/19/2012 | 9/2/2013 |
| Dick Teresi | Author | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Arthur Toga | Neuroscience | Wired for Thought | 1/16/2012 | 1/16/2012 |
| Jonathan Trent | Aeronautics/Space | Fuel’s Paradise | 4/25/2011 | 8/6/2012 |
| Compton Tucker | Aeronautics/Space | Space Archaeology | 6/6/2011 | 10/22/2012 |
| Neil deGrasse Tyson | Astronomy | Getting a Spacelift | 2/6/2012 | 7/15/2013 |
| Neil deGrasse Tyson | Astronomy | Seth’s Cabinet of Wonders | 3/12/2012 | 3/12/2012 |
| James Underdown | Sociology | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Eric Van De Graaf | Health/Medicine | Humans Need Not Apply | 11/22/2010 | 4/16/2012 |
| Alessandro Vespignani | Physics | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Bradley Voytek | Neuroscience | Wired for Thought | 1/16/2012 | 1/16/2012 |
| Bradley Voytek | Neuroscience | Doomsday Live, Part 2 | 12/3/2012 | 12/3/2012 |
| Robert Wagoner | Physics | The Invisible In-Between | 9/3/2012 | 9/3/2012 |
| Shannon Walker | Aeronautics/Space | Getting a Spacelift | 2/6/2012 | 7/15/2013 |
| Bill Wasik | Journalism/Technical Writing | Skeptic Check: Zombies Aren’t Real | 11/12/2012 | 1/13/2014 |
| Nicolas Weidinger | Futurist | Material Whirl | 1/30/2012 | 7/8/2013 |
| George Weinstock | Biology | Gene Hack, Man | 12/10/2012 | 2/10/2014 |
| Margaret Wertheim | Journalism/Technical Writing | Cosmos: It’s Big, It’s Weird | 1/9/2012 | 6/3/2013 |
| Sue Wilhite | Other | Skeptic Check: Prog-Not-Stication | 3/5/2012 | 3/5/2012 |
| Peter Williams | Earth Sciences/Ecology/Climate Change | Skeptic Check: Energy Vortex | 1/23/2012 | 9/17/2012 |
| Stan Williams | Computer Science | Nano Nano | 2/21/2011 | 7/2/2012 |
| Josh Winn | Astronomy | Found in Space | 11/8/2010 | 3/26/2012 |
| Marcus Wohlsen | Journalism/Technical Writing | [Rectangular Container] Thinking | 5/23/2011 | 10/8/2012 |
| Felisa Wolfe-Simon | Astrobiology | A Martian Curiosity | 8/13/2012 | 8/13/2012 |
| Vanessa Woods | Biology | Aware Am I? | 11/1/2010 | 2/13/2012 |
| Tim Wu | Law | Better Mousetrap | 2/7/2011 | 6/4/2012 |
| Andrea Wulf | Author | Mass Transits | 5/28/2012 | 5/28/2012 |
| Michael Wyde | Biology | Skeptic Check: Mysterious Illness | 10/1/2012 | 10/1/2012 |
