Below is a list of the guests from episodes that were first aired or last repeated in 2019. To listen, click on the episode title to go to that episode’s page.
| Name | Discipline_Profession | Episode Title | Episode Date | Last Aired |
|---|---|---|---|---|
| Steve Adler | Other | Gained in Translation | 4/22/2019 | 4/22/2019 |
| David Anderson | Anthropology | New Water Worlds | 8/27/2018 | 5/20/2019 |
| Amy Arnsten | Neuroscience | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Jeremy Bailenson | Robotics/IA | We Are VR | 5/7/2018 | 2/25/2019 |
| Laurie Barge | Astrobiology | Is Life Inevitable? | 5/13/20119 | 5/13/2019 |
| Vince Beiser | Journalism/Technical Writing | True Grit | 1/14/2019 | 8/19/2019 |
| Alex Berezow | Biology | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Katie Bethea | Computer Science | Supercomputer Showdown | 11/4/2019 | 11/4/2019 |
| Susanna Blackwell | Biology | You’ve Got Whale | 10/29/2018 | 6/16/2019 |
| Yap Boum | Health/Medicine | Stopping Ebola | 11/19/2019 | 11/19/2019 |
| Raphael Boussa | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Kevin Bowyer | Computer Science | Identity Crisis | 7/23/2018 | 4/29/2019 |
| Kate Brown | History | Rethinking Chernobyl | 5/6/2019 | 5/6/2019 |
| Mike Brown | Geology | Shell on Earth | 3/27/2017 | 12/9/19 |
| Nathalie Cabrol | Planetary Science | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Richard Camuccio | Astrophysics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Elizabeth Chamberlain | Earth Sciences/Ecology/Climate Change | True Grit | 1/14/2019 | 8/19/2019 |
| Joe Charbonnet | Other | True Grit | 1/14/2019 | 8/19/2019 |
| Eugenia Cheng | Mathematics | Math’s Paths | 7/15/2019 | 7/15/2019 |
| Eric Chudler | Engineering | Skeptic Check: Astrology Ascending | 2/4/2019 | 2/4/2019 |
| Eric Chudler | Education | Skeptic Check: Worrier Mentality | 5/27/2019 | 5/27/2019 |
| Arnaud Chulliat | Geology | Go with the Flow | 4/8/2019 | 10/14/2019 |
| Owen Churchill | Journalism/Technical Writing | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Patricia S. Churchland | Humanities | Let’s Stick Together | 7/22/2019 | 7/22/2019 |
| Lucy Cooke | Biology | Creature Discomforts | 10/8/2018 | 6/3/2019 |
| Caroline Criado-Perez | Journalism/Technical Writing | Skeptic Check: Data Bias | 9/2/2019 | 9/2/2019 |
| Kade Crockford | Education | Skeptic Check: Data Bias | 9/2/2019 | 9/2/2019 |
| Jason Crusan | Aeronautics/Space | High Moon | 4/23/2018 | 3/4/2019 |
| Carolina Cruz-Neira | Computer Science | We Are VR | 5/7/2018 | 2/25/2019 |
| Bruce Damer | Engineering | Is Life Inevitable? | 5/13/20119 | 5/13/2019 |
| Frans de Waal | Biology | Animals Like Us | 6/24/20119 | 6/24/2019 |
| Jennifer DeBruyn | Biology | Battling Bacteria | 10/7/2019 | 10/7/2019 |
| Laurance Doyle | Astronomy | Skeptic Check: Rational Lampoon | 7/3/2017 | 10/28/2019 |
| Rob Dunn | Earth Sciences/Ecology/Climate Change | Rip Van Winkle Worm | 1/21/2019 | 9/16/2019 |
| Rob Dunn | Earth Sciences/Ecology/Climate Change | Granting Immunity | 8/12/2019 | 8/12/2019 |
| Harry Dyer | Education | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Jeremy England | Physics | Is Life Inevitable? | 5/13/20119 | 5/13/2019 |
| Vanessa Ezenwa | Earth Sciences/Ecology/Climate Change | You Are Exposed | 5/14/2018 | 3/25/2019 |
| Brian Fagan | Anthropology | New Water Worlds | 8/27/2018 | 5/20/2019 |
| Jason Fagone | Author | DecodeHer | 4/1/2019 | 4/1/2019 |
| Daniel Finkel | Mathematics | Math’s Paths | 7/15/2019 | 7/15/2019 |
| Ephraim Fischbach | Physics | Radical Cosmology | 2/18/2019 | 11/11/2019 |
| Charles Fishman | Author | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Katherine Foley | Journalism/Technical Writing | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Martin Ford | Futurist | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Andrew Fraknoi | Astronomy | Skeptic Check: Astrology Ascending | 2/4/2019 | 2/4/2019 |
| Andrew Fraknoi | Astronomy | Yule Like This | 12/17/2018 | 12/2/2019 |
| Jenna Gallas | Industry | Yule Like This | 12/17/2018 | 12/2/2019 |
| Adam Gazzaley | Neuroscience | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Rose George | Journalism/Technical Writing | Go with the Flow | 4/8/2019 | 10/14/2019 |
| Neil Gemmel | Health/Medicine | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Pupa Gilbert | Biology | True Grit | 1/14/2019 | 8/19/2019 |
| Simon Gilroy | Biology | You’ve Got Whale | 10/29/2018 | 6/6/2019 |
| Nicole Gladish | Genetics/Genomics | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Jeff Goodell | Journalism/Technical Writing | New Water Worlds | 8/27/2018 | 5/20/2019 |
| Roy Gould | Astronomy | Nobel Efforts | 10/21/2019 | 10/21/2019 |
| Peter Greenberg | Biology | You’ve Got Whale | 10/29/2018 | 6/6/2019 |
| Banu Guler | Other | Skeptic Check: Astrology Ascending | 2/4/2019 | 2/4/2019 |
| Lauren Gunderson | Author | DecodeHer | 4/1/2019 | 4/1/2019 |
| Kimberley Hambuchen | Aeronautics/Space | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Matt Hayes | Education | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Douglas Haynes | History | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Allen Herbert | Industry | High Moon | 4/23/2018 | 3/4/2019 |
| Britt Marie Hermes | Genetics/Genomics | Skeptic Check: Betting on Pseudoscience | 11/25/2019 | 11/25/2019 |
| Tina Hesman Saey | Journalism/Technical Writing | Identity Crisis | 7/23/2018 | 4//29/2019 |
| Adam Higginbotham | Author | Rethinking Chernobyl | 5/6/2019 | 5/6/2019 |
| Sharon Hill | Geology | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Jack Holt | Geology | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Mark Honigsbaum | History | Battling Bacteria | 10/7/2019 | 10/7/2019 |
| Ted Huetter | Education | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| David Ibbett | Music | Nobel Efforts | 10/21/2019 | 10/21/2019 |
| Steve Illardi | Psychology | Handling the Holidays | 12/23/2019 | 12/23/2019 |
| Chris Impey | Astronomy | Radical Cosmology | 2/18/2019 | 11/11/2019 |
| Lise Johnson | Education | Skeptic Check: Worrier Mentality | 5/27/2019 | 5/27/2019 |
| James Allen Joki | Aeronautics/Space | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Scott Kelly | Aeronautics/Space | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Wolfgang Ketterle | Physics | For Good Measure | 9/9/2019 | 9/9/2019 |
| Rob Knight | Biology | You Are Exposed | 5/14/2018 | 3/25/2019 |
| Yogesh Kolte | Engineering | Skeptic Check: Astrology Ascending | 2/4/2019 | 2/4/2019 |
| Shinjini Kundu | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Kenneth Lacovara | Biology | Free Range Dinosaurs | 6/25/2018 | 4/15/2019 |
| Janna Levin | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Carl Lipo | Anthropology | Headed For Trouble | 9/30/2019 | 9/30/2019 |
| Karen Lloyd | Biology | Rip Van Winkle Worm | 1/21/2019 | 9/16/2019 |
| Rowan Lockwood | Biology | Shell on Earth | 3/27/2017 | 12/9/19 |
| John Love | Biology | Waste Not | 12/16/2019 | 12/16/2019 |
| Michael Mann | Earth Sciences/Ecology/Climate Change | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Lisa Margonelli | Journalism/Technical Writing | Creature Discomforts | 10/8/2018 | 6/3/2019 |
| Elizabeth Margulis | Music | Handling the Holidays | 12/23/2019 | 12/23/2019 |
| Richard Marlink | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Alberto Martinez | History | Radical Cosmology | 2/18/2019 | 11/11/2019 |
| Christopher Mason | Genetics/Genomics | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Lilian Matallana | Earth Sciences/Ecology/Climate Change | Yule Like This | 12/17/2018 | 12/2/2019 |
| Philip Matthews | Biology | Go with the Flow | 4/8/2019 | 10/14/2019 |
| Amy Maxman | Journalism/Technical Writing | Stopping Ebola | 11/19/2019 | 11/19/2019 |
| Andrew Maynard | Sociology | Sci-Fi From the Future | 1/7/2019 | 8/5/2019 |
| Lee McIntyre | Philosophy | Skeptic Check: Betting on Pseudoscience | 11/25/2019 | 11/25/2019 |
| Thomas Metzinger | Neuroscience | We Are VR | 5/7/2018 | 2/25/2019 |
| Chris Metzler | Other | Creature Discomforts | 10/8/2018 | 6/3/2019 |
| Gary Miller | Health/Medicine | You Are Exposed | 5/14/2018 | 3/25/2019 |
| Adam Minter | Author | Waste Not | 12/16/2019 | 12/16/2019 |
| Mark Miodownik | Technology | Go with the Flow | 4/8/2019 | 10/14/2019 |
| Leonard Mlodinow | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Leonard Mlodinow | Physics | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Mark Moffett | Biology | Let’s Stick Together | 7/22/2019 | 7/22/2019 |
| Alex Moshakis | Journalism/Technical Writing | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Indira Mysorekar | Biology | You Are Exposed | 5/14/2018 | 3/25/2019 |
| Shaugnessy Naughton | Other | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Ted Nordhaus | Earth Sciences/Ecology/Climate | Rethinking Chernobyl | 5/6/2019 | 5/6/2019 |
| Julie Norem | Psychology | Handling the Holidays | 12/23/2019 | 12/23/2019 |
| Peter Norvig | Industry | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Geoff Nunn | Education | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Dee O’Hara | Aeronautics/Space | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Paul Offit | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Malka Older | Author | Keeping Humans in the Loop | 2/11/2019 | 9/23/2019 |
| Ben Orlin | Mathematics | Yule Like This | 12/17/2018 | 12/2/2019 |
| Robert Palmer | Journalism/Technical Writing | Skeptic Check: Betting on Pseudoscience | 11/25/2019 | 11/25/2019 |
| Sarah Parcak | History | Headed For Trouble | 9/30/2019 | 9/30/2019 |
| Tom Patterson | Psychology | Battling Bacteria | 10/7/2019 | 10/7/2019 |
| James Grant Peterkin | Other | Headed For Trouble | 9/30/2019 | 9/30/2019 |
| Phil Plait | Astronomy | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Jon Pratt | Engineering | For Good Measure | 9/9/2019 | 9/9/2019 |
| Amanda Preske | Chemistry | Supercomputer Showdown | 11/4/2019 | 11/4/2019 |
| Amanda Preske | Chemistry | Waste Not | 12/16/2019 | 12/16/2019 |
| Richard Preston | Journalism/Technical Writing | Stopping Ebola | 11/19/2019 | 11/19/2019 |
| Nathan Proctor | Other | Waste Not | 12/16/2019 | 12/16/2019 |
| Jani Radenbaugh | Planetary Science | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Mitch Ratcliffe | Industry | Handling the Holidays | 12/23/2019 | 12/23/2019 |
| Wahltyn Rattray | Astronomy | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Marc Rayman | Aeronautics/Space | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Julia Rayz | Computer Science | Gained in Translation | 4/22/2019 | 4/22/2019 |
| Martin Rees | Astronomy | Keeping Humans in the Loop | 2/11/2019 | 9/23/2019 |
| Matt Richtel | Author | Granting Immunity | 8/12/2019 | 8/12/2019 |
| Eleanor Rieffel | Mathematics | Supercomputer Showdown | 11/4/2019 | 11/4/2019 |
| Katherine Riley | Computer Science | Supercomputer Showdown | 11/4/2019 | 11/4/2019 |
| David Robson | Journalism/Technical Writing | Skeptic Check: Worrier Mentality | 5/27/2019 | 5/27/2019 |
| Kevin Roose | Journalism/Technical Writing | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Lynn Rothschild | Biology | Rip Van Winkle Worm | 1/21/2019 | 9/16/2019 |
| Peter Rubin | Journalism/Technical Writing | We Are VR | 5/7/2018 | 2/25/2019 |
| Douglas Rushkoff | Sociology | Keeping Humans in the Loop | 2/11/2019 | 9/23/2019 |
| Adam Rutherford | Genetics/Genomics | Let’s Stick Together | 7/22/2019 | 7/22/2019 |
| Robert Sapolsky | Neuroscience | Skeptic Check: Rational Lampoon | 7/3/2017 | 10/28/2019 |
| Reshma Saujani | Author | DecodeHer | 4/1/2019 | 4/1/2019 |
| Caleb Scharf | Astrobiology | Is Life Inevitable? | 5/13/20119 | 5/13/2019 |
| Stuart Schlisserman | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Greg Schmidt | Aeronautics/Space | High Moon | 4/23/2018 | 3/4/2019 |
| Kevin Schneider | Law | Animals Like Us | 6/24/20119 | 6/24/2019 |
| Anne Schukraft | Physics | Radical Cosmology | 2/18/2019 | 11/11/2019 |
| Jacob Shell | Geography | Animals Like Us | 6/24/20119 | 6/24/2019 |
| Ethan Siegel | Astrophysics | Yule Like This | 12/17/2018 | 12/2/2019 |
| Rudy Simoneaux | Engineering | True Grit | 1/14/2019 | 8/19/2019 |
| Peter Singer | Philosophy | Animals Like Us | 6/24/20119 | 6/24/2019 |
| Steven Sloman | Psychology | Skeptic Check: Rational Lampoon | 7/3/2017 | 10/28/2019 |
| James Smith | Earth Sciences/Ecology/Climate | Rethinking Chernobyl | 5/6/2019 | 5/6/2019 |
| Jeffrey Smith | Astrobiology | Nobel Efforts | 10/21/2019 | 10/21/2019 |
| Michael Snyder | Genetics/Genomics | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Adam South | Health/Medicine | Handling the Holidays | 12/23/2019 | 12/23/2019 |
| Steffanie Strathdee | Health/Medicine | Battling Bacteria | 10/7/2019 | 10/7/2019 |
| Steve Strogatz | Mathematics | Math’s Paths | 7/15/2019 | 7/15/2019 |
| Anne Sverdrup-Thygeson | Biology | Granting Immunity | 8/12/2019 | 8/12/2019 |
| Al Tanner | Biology | Shell on Earth | 3/27/2017 | 12/9/19 |
| Fred Turek | Biology | Battling Bacteria | 10/7/2019 | 10/7/2019 |
| Willie Turner | Industry | Skeptic Check: Worrier Mentality | 5/27/2019 | 5/27/2019 |
| James Underdown | Sociology | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| David Underhill | Health/Medicine | Granting Immunity | 8/12/2019 | 8/12/2019 |
| Douglas Vakoch | Sociology | Gained in Translation | 4/22/2019 | 4/22/2019 |
| Shankar Venkataramani | Mathematics | Math’s Paths | 7/15/2019 | 7/15/2019 |
| Amy Webb | Futurist | Skeptic Check: Data Bias | 9/2/2019 | 9/2/2019 |
| Andy Weir | Author | High Moon | 4/23/2018 | 3/4/2019 |
| Jack Wells | Computer Science | Supercomputer Showdown | 11/4/2019 | 11/4/2019 |
| Charles Wheelan | Author | Skeptic Check: Worrier Mentality | 5/27/2019 | 5/27/2019 |
| David Whitehouse | Journalism/Technical Writing | Nailing the Moon Landing | 7/1/2019 | 7/1/2019 |
| Kyle Wiens | Industry | Waste Not | 12/16/2019 | 12/16/2019 |
| Caroline Williams | Journalism/Technical Writing | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Simon Winchester | Author | For Good Measure | 9/9/2019 | 9/9/2019 |
| Richard Wrangham | Anthropology | Gained in Translation | 4/22/2019 | 4/22/2019 |
| Robert Young | Geology | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Carl Zimmer | Journalism/Technical Writing | Identity Crisis | 7/23/2018 | 4/29/2019 |
| Carl Zimmer | Journalism/Technical Writing | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
