Below is a list of the guests from episodes that were first aired or last repeated in 2007. To listen, click on the episode title to go to that episode’s page.
| Name | Discipline/Profession | Episode Title | Episode Date | Last Aired |
|---|---|---|---|---|
| Marc Abrahams | Journalism/Technical Writing | Skeptical Sunday: Risky Business | 11/12/2007 | 7/28/2008 |
| John Adams | Geography | Skeptical Sunday: Risky Business | 11/12/2007 | 7/28/2008 |
| Paul Allen | Industry | Watch This Space | 10/15/2007 | 10/15/2007 |
| Natalie Angier | Journalism/Technical Writing | Sigh. It’s Science | 5/28/2007 | 6/30/2008 |
| Kevin Baines | Planetary Science | Watch This Space | 10/15/2007 | 10/15/2007 |
| Warren Belasco | Sociology | The End of Food | 6/25/2007 | 2/25/2008 |
| Kennette Benedict | Journalism/Technical Writing | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| Gregory Benford | Author | Engineers Gone Wild | 1/17/2007 | 1/17/2007 |
| Alex Bentley | Anthropology | Order and Chaos | 7/9/2007 | 3/24/2008 |
| Charles Bentley | Geology | Early Life | 3/22/2007 | 3/22/2007 |
| Charles Bentley | Geology | Pole to Pole | 11/19/2007 | 11/19/2007 |
| Jacob Berkowitz | Author | Science Detectives | 12/24/2007 | 12/24/2007 |
| Max Bernstein | Aeronautics/Space | Early Life | 3/22/2007 | 3/22/2007 |
| Bruce Betts | Aeronautics/Space | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| Frederick Bieber | Genetics/Genomics | DNA: The Nucleotide is Turning | 2/27/2007 | 2/27/2007 |
| Susan Blackmore | Psychology | Skeptical Sunday: Take Eye of Newt and Call Me in the Morning | 9/3/2007 | 9/3/2007 |
| Leo Blitz | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| Paul Bloom | Psychology | Sigh. It’s Science | 5/28/2007 | 6/30/2008 |
| Bob Bly | Author | Engineers Gone Wild | 1/17/2007 | 1/17/2007 |
| Nick Bostrom | Futurist | Seth’s Basement | 8/27/2007 | 8/27/2007 |
| Mark Buchanan | Physics | Order and Chaos | 7/9/2007 | 3/24/2008 |
| Colin Burgess | Author | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| Ken Caldeira | Earth Sciences/Ecology/Climate Change | Engineers Gone Wild | 1/17/2007 | 1/17/2007 |
| Michael Castellini | Biology | Pole to Pole | 11/19/2007 | 11/19/2007 |
| Patricia S. Churchland | Humanities | That Thinking Feeling | 3/15/2007 | 3/15/2007 |
| Stewart Clark | Author | Our Celestial Bodies, Ourselves | 5/6/2007 | 5/6/2007 |
| David Clary | Author | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| Gregory Cochran | Physics | Technology: Hero or Horror? | 1/30/2007 | 1/30/2007 |
| Gwyneth Cravens | Journalism/Technical Writing | Mot’am I’m Atom | 10/29/2007 | 10/29/2007 |
| William Crossman | Author | You Talkin’ to Me? | 8/20/2007 | 2/4/2008 |
| Paul Davies | Futurist | Extreme Physics | 2/6/2007 | 2/6/2007 |
| Paul Dawson | Biology | Hand Me Microbe (and Slippers) | 10/8/2007 | 10/8/2007 |
| Kathryn Denning | Anthropology | Skeptical Sunday: Tomb Be or Not Tomb Be: The Lost Tomb of Jesus? | 7/17/2007 | 7/17/2007 |
| Kathryn Denning | Anthropology | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| Peter Diamandis | Industry | Sputnik: 50 Years, One Month, Two Weeks Later | 12/10/2007 | 12/10/2007 |
| Russell L. Doescher | Physics | Science Detectives | 12/24/2007 | 12/24/2007 |
| Paul Doherty | Physics | Sigh. It’s Science | 5/28/2007 | 6/30/2008 |
| Laurance Doyle | Astronomy | You Talkin’ to Me? | 8/20/2007 | 2/4/2008 |
| Frank Drake | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| Frank Drake | Astronomy | Array of Hope | 3/29/2007 | 3/29/2007 |
| Chris Dubbs | Author | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| Ron Ekers | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| D. Ellett | Physics | Mot’am I’m Atom | 10/29/2007 | 10/29/2007 |
| Steve Ettlinger | Author | The End of Food | 6/25/2007 | 2/25/2008 |
| Craig Evans | Theology | Skeptical Sunday: Tomb Be or Not Tomb Be: The Lost Tomb of Jesus? | 7/17/2007 | 7/17/2007 |
| Timothy Ferris | Author | Seth’s Basement | 8/27/2007 | 8/27/2007 |
| Alex Filippenko | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| Jascin Leonardo Finger | Education | Our Celestial Bodies, Ourselves | 5/6/2007 | 5/6/2007 |
| Cary Fowler | Industry | Ctrl-S | 10/22/2007 | 4/14/2008 |
| Stan Friedman | Other | A Special Skeptical Sunday: Road Trip to Roswell Part 1 | 4/12/2007 | 4/12/2007 |
| Tim Friend | Journalism/Technical Writing | Hand Me Microbe (and Slippers) | 10/8/2007 | 10/8/2007 |
| Richard Garriott | Entertainment | Sputnik: 50 Years, One Month, Two Weeks Later | 12/10/2007 | 12/10/2007 |
| Ben Goldacre | Health/Medicine | Skeptical Sunday: Take Eye of Newt and Call Me in the Morning | 9/3/2007 | 9/3/2007 |
| Judith Marx Golub | Other | Watch This Space | 10/15/2007 | 10/15/2007 |
| Hugh Gusterson | Anthropology | Doomsday Part II: When the Smoke Clears | 9/10/2007 | 9/10/2007 |
| Lee Gutkind | Author | Driving Evolution | 8/13/2007 | 2/18/2008 |
| Timothy Hallman | Physics | Extreme Physics | 2/6/2007 | 2/6/2007 |
| Diane Halpern | Psychology | Technology: Hero or Horror? | 1/30/2007 | 1/30/2007 |
| Gerry Harp | Physics | Watch This Space | 10/15/2007 | 10/15/2007 |
| Charles Harper | Industry | When Machines Rule | 9/24/2007 | 7/14/2008 |
| David Harrison | Humanities | Ctrl-S | 10/22/2007 | 4/14/2008 |
| Ralph Harvey | Geology | Pole to Pole | 11/19/2007 | 11/19/2007 |
| Harla Heidelberg | Biology | DNA: The Nucleotide is Turning | 2/27/2007 | 2/27/2007 |
| Bruce Hood | Psychology | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| Andrew Howard | Physics | Array of Hope | 3/29/2007 | 3/29/2007 |
| Lynne Isbell | Anthropology | Driving Evolution | 8/13/2007 | 2/18/2008 |
| Dave Itzkoff | Journalism/Technical Writing | Array of Hope | 3/29/2007 | 3/29/2007 |
| Simcha Jacobovici | Entertainment | Skeptical Sunday: Tomb Be or Not Tomb Be: The Lost Tomb of Jesus? | 7/17/2007 | 7/17/2007 |
| Peter Jenniskens | Planetary Science | Seth’s Basement | 8/27/2007 | 8/27/2007 |
| Kal Korff | Journalism/Technical Writing | A Special Skeptical Sunday: Road Trip to Roswell Part 2 | 4/30/2007 | 4/30/2007 |
| Bernie Krause | Biology | You Talkin’ to Me? | 8/20/2007 | 2/4/2008 |
| Lawrence Krauss | Physics | Order and Chaos | 7/9/2007 | 3/24/2008 |
| Jaron Lanier | Futurist | That Thinking Feeling | 3/15/2007 | 3/15/2007 |
| Willliam LeFurgy | Computer Science | Ctrl-S | 10/22/2007 | 4/14/2008 |
| Kathy Licht | Geology | Pole to Pole | 11/19/2007 | 11/19/2007 |
| David Liddle | Industry | Watch This Space | 10/15/2007 | 10/15/2007 |
| Bruce Lieberman | Geology | Early Life | 3/22/2007 | 3/22/2007 |
| Darlene Lim | Planetary Science | Pole to Pole | 11/19/2007 | 11/19/2007 |
| Rocco Mancinelli | Biology | From Microbes to Mensa: What Life is Out There? | 1/9/2007 | 1/9/2007 |
| Charles C. Mann | Author | First Contact! | 5/14/2007 | 11/24/2008 |
| John Marshall | Planetary Science | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| Jason Matheny | Industry | The End of Food | 6/25/2007 | 2/25/2008 |
| Chris McKay | Planetary Science | From Microbes to Mensa: What Life is Out There? | 1/9/2007 | 1/9/2007 |
| Vicky Meadows | Astrobiology | Our Celestial Bodies, Ourselves | 5/6/2007 | 5/6/2007 |
| Marvin Minsky | Robotics/IA | That Thinking Feeling | 3/15/2007 | 3/15/2007 |
| John Moreau | Biology | Hand Me Microbe (and Slippers) | 10/8/2007 | 10/8/2007 |
| David Morrison | Planetary Science | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| David Morrison | Planetary Science | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| Erin Murphy | Law | DNA: The Nucleotide is Turning | 2/27/2007 | 2/27/2007 |
| Joe Nickell | Sociology | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| James Oberg | Aeronautics/Space | Science Detectives | 12/24/2007 | 12/24/2007 |
| Bill Oxley | Entertainment | Watch This Space | 10/15/2007 | 10/15/2007 |
| Greg Papadopoulos | Industry | Watch This Space | 10/15/2007 | 10/15/2007 |
| Bob Papparlardo | Planetary Science | Watch This Space | 10/15/2007 | 10/15/2007 |
| Stuart Parkin | Physics | Ctrl-S | 10/22/2007 | 4/14/2008 |
| Chris Parkinson | Biology | Watch This Space | 10/15/2007 | 10/15/2007 |
| Charlie Petit | Journalism/Technical Writing | Sigh. It’s Science | 5/28/2007 | 6/30/2008 |
| William Phelps | Other | Our Celestial Bodies, Ourselves | 5/6/2007 | 5/6/2007 |
| Phil Plait | Astronomy | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| Phil Plait | Astronomy | Skeptical Sunday: Take Eye of Newt and Call Me in the Morning | 9/3/2007 | 9/3/2007 |
| Phil Plait | Astronomy | Skeptical Sunday: Tomb Be or Not Tomb Be: The Lost Tomb of Jesus? | 7/17/2007 | 7/17/2007 |
| Phil Plait | Astronomy | Skeptical Sunday: Risky Business | 11/12/2007 | 7/28/2008 |
| Phil Plait | Astronomy | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| Carolyn Porco | Planetary Science | Religion and Science: Deity Meets Data | 6/10/2007 | 6/10/2007 |
| Joel Primack | Physics | Extreme Physics | 2/6/2007 | 2/6/2007 |
| Emily Pronin | Psychology | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| David Quammen | Journalism/Technical Writing | Order and Chaos | 7/9/2007 | 3/24/2008 |
| Adam Reiss | Physics | Extreme Physics | 2/6/2007 | 2/6/2007 |
| David Ropeik | Sociology | Skeptical Sunday: Risky Business | 11/12/2007 | 7/28/2008 |
| John Rummel | Astrobiology | First Contact! | 5/14/2007 | 11/24/2008 |
| Karl Sabbagh | Author | Technology: Hero or Horror? | 1/30/2007 | 1/30/2007 |
| Scott Sandford | Astrophysics | From Microbes to Mensa: What Life is Out There? | 1/9/2007 | 1/9/2007 |
| Josh Schollmeyer | Journalism/Technical Writing | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| Julie Schuster | Entertainment | A Special Skeptical Sunday: Road Trip to Roswell Part 2 | 4/30/2007 | 4/30/2007 |
| John R. Searle | Philosophy | That Thinking Feeling | 3/15/2007 | 3/15/2007 |
| Michael Shermer | Journalism/Technical Writing | A Special Skeptical Sunday: Road Trip to Roswell Part 2 | 4/30/2007 | 4/30/2007 |
| Everett Sherwood | Engineering | When Machines Rule | 9/24/2007 | 7/14/2008 |
| Seth Shostak | Astronomy | From Microbes to Mensa: What Life is Out There? | 1/9/2007 | 1/9/2007 |
| Bertha Shostak | Other | Early Life | 3/22/2007 | 3/22/2007 |
| Mark Showalter | Planetary Science | Seth’s Basement | 8/27/2007 | 8/27/2007 |
| Timothy Silcott | Evolutionary Sciences | First Contact! | 5/14/2007 | 11/24/2008 |
| Gordy Slack | Journalism/Technical Writing | Religion and Science: Deity Meets Data | 6/10/2007 | 6/10/2007 |
| Victor Stenger | Physics | Religion and Science: Deity Meets Data | 6/10/2007 | 6/10/2007 |
| Thomas Stohlgren | Earth Sciences/Ecology/Climate Change | A Special Skeptical Sunday: Road Trip to Roswell Part 1 | 4/12/2007 | 4/12/2007 |
| Nicholas Strausfeld | Neuroscience | That Thinking Feeling | 3/15/2007 | 3/15/2007 |
| Peter Swan | Aeronautics/Space | Sputnik: 50 Years, One Month, Two Weeks Later | 12/10/2007 | 12/10/2007 |
| Jill Tarter | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| Jill Tarter | Astronomy | Array of Hope | 3/29/2007 | 3/29/2007 |
| John Taschner | Physics | A Special Skeptical Sunday: Road Trip to Roswell Part 1 | 4/12/2007 | 4/12/2007 |
| John Taschner | Physics | Mot’am I’m Atom | 10/29/2007 | 10/29/2007 |
| Carol Tavris | Psychology | Doomsday Part II: When the Smoke Clears | 9/10/2007 | 9/10/2007 |
| Timothy Taylor | Biology | Driving Evolution | 8/13/2007 | 2/18/2008 |
| Travis Taylor | Author | First Contact! | 5/14/2007 | 11/24/2008 |
| Brad Templeton | Computer Science | When Machines Rule | 9/24/2007 | 7/14/2008 |
| Steve Trimberger | Engineering | Watch This Space | 10/15/2007 | 10/15/2007 |
| Virginia Trimble | Physics | Order and Chaos | 7/9/2007 | 3/24/2008 |
| Katherine Trinidad | Aeronautics/Space | Let’s Do Launch | 7/30/2007 | 7/30/2007 |
| James Underdown | Sociology | Skeptical Sunday: Risky Business | 11/12/2007 | 7/28/2008 |
| James Underdown | Sociology | Skeptical Sunday: Take Eye of Newt and Call Me in the Morning | 9/3/2007 | 9/3/2007 |
| James Underdown | Sociology | Skeptical Sunday: When the Stakes Are High | 2/14/2007 | 2/14/2007 |
| Douglas Vakoch | Sociology | Array of Hope | 3/29/2007 | 3/29/2007 |
| Dennis Verstynen | History | A Special Skeptical Sunday: Road Trip to Roswell Part 1 | 4/12/2007 | 4/12/2007 |
| Alex Vilenkin | Physics | Extreme Physics | 2/6/2007 | 2/6/2007 |
| Nicholas Wade | Journalism/Technical Writing | DNA: The Nucleotide is Turning | 2/27/2007 | 2/27/2007 |
| Nicholas Wade | Journalism/Technical Writing | Driving Evolution | 8/13/2007 | 2/18/2008 |
| Hunter Waite | Physics | Watch This Space | 10/15/2007 | 10/15/2007 |
| Peter Ward | Biology | From Microbes to Mensa: What Life is Out There? | 1/9/2007 | 1/9/2007 |
| Peter Ward | Biology | Doomsday Part II: When the Smoke Clears | 9/10/2007 | 9/10/2007 |
| Samuel K. Wasser | Biology | Science Detectives | 12/24/2007 | 12/24/2007 |
| George Weinstock | Biology | Hand Me Microbe (and Slippers) | 10/8/2007 | 10/8/2007 |
| Alan Weisman | Author | Doomsday Part II: When the Smoke Clears | 9/10/2007 | 9/10/2007 |
| Craig Wheeler | Astronomy | Doomsday: the Early Hours | 1/24/2007 | 1/24/2007 |
| Robert Whittaker | Biology | First Contact! | 5/14/2007 | 11/24/2008 |
| Lewis Wolpert | Biology | Religion and Science: Deity Meets Data | 6/10/2007 | 6/10/2007 |
| Laura Woodmansee | Author | Engineers Gone Wild | 1/17/2007 | 1/17/2007 |
| Simon “Pete” Worden | Aeronautics/Space | Sputnik: 50 Years, One Month, Two Weeks Later | 12/10/2007 | 12/10/2007 |
| Mel Wright | Astronomy | Watch This Space | 10/15/2007 | 10/15/2007 |
| Eliezer Yudkowsky | Robotics/IA | When Machines Rule | 9/24/2007 | 7/14/2008 |
| Ben Zuckerman | Physics | Array of Hope | 3/29/2007 | 3/29/2007 |
