Below is a list of the guests from episodes that were first aired or last repeated in 2018. To listen, click on the episode title to go to that episode’s page.
| Name | Discipline_Profession | Episode Title | Episode Date | Last Aired |
|---|---|---|---|---|
| Eddie Allison | Aeronautics/Space | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Adam Alter | Psychology | Your Brain’s Reins | 4/10/2017 | 5/21/2018 |
| Walter Alvarez | Geology | Geology is Destiny | 1/16/2017 | 1/15/2018 |
| 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 |
| Asmud Asdal | Biology | On Thin Ice | 8/13/2017 | 7/16/2018 |
| Jeremy Bailenson | Robotics/IA | We Are VR | 5/7/2018 | 2/25/2019 |
| Alex Berezow | Biology | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Susanna Blackwell | Biology | You’ve Got Whale | 10/29/2018 | 6/16/2019 |
| Paul Bogard | Humanities | What Goes Around | 7/24/2017 | 7/9/2018 |
| Melanie Brickman Borchard | Education | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Raphael Boussa | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Kevin Bowyer | Computer Science | Identity Crisis | 7/23/2018 | 4/29/2019 |
| Allan Brandt | History | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Anthony Brandt | Music | Creative Brains | 2/5/2018 | 12/3/2018 |
| Mike Brown | Geology | Shell on Earth | 3/27/2017 | 12/9/19 |
| Dean Buonomano | Neuroscience | Time on Your Side | 5/8/2017 | 5/28/2018 |
| Nathalie Cabrol | Planetary Science | Imagining Planets | 6/4/2018 | 6/14/2018 |
| Nathalie Cabrol | Planetary Science | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Richard Camuccio | Astrophysics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Arthur (Art) Caplan | Health/Medicine | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| John Carlin | Law | Angles of a Hack | 9/18/2017 | 9/10/2018 |
| Hilarie Cash | Industry | Your Brain’s Reins | 4/10/2017 | 5/21/2018 |
| James Cheshire | Geography | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| Owen Churchill | Journalism/Technical Writing | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Kathryn Clancy | Anthropology | Wonder Women | 11/20/2017 | 10/1/2018 |
| James Cole | Neuroscience | Time on Your Side | 5/8/2017 | 5/28/2018 |
| Lucy Cooke | Biology | Creature Discomforts | 10/8/2018 | 6/3/2019 |
| Sarah Cruddas | Journalism/Technical Writing | Space: Why Go There | 3/5/2018 | 12/24/2018 |
| 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 |
| Helen Czerski | Physics | What Have You Got to Move? | 3/13/2017 | 4/30/2018 |
| Michael Dahlstrom | Journalism/Technical Writing | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Paul Davies | Futurist | DNA: Nature’s Hard Drive | 11/6/2017 | 9/17/2018 |
| Kevin Davis | Author | Your Brain’s Reins | 4/10/2017 | 5/21/2018 |
| Frans de Waal | Biology | Are Animals Really That Smart? | 12/12/2016 | 1/8/2018 |
| Andrew Dent | Industry | It’s In Material | 10/2/2017 | 7/30/2018 |
| Edward Dolnick | Journalism/Technical Writing | Frogs’ Pants | 7/9/2017 | 7/2/2018 |
| Harry Dyer | Education | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| David Eagleman | Neuroscience | Brain Dust | 12/5/2016 | 4/9/2018 |
| David Eagleman | Neuroscience | Creative Brains | 2/5/2018 | 12/3/2018 |
| Laura Esposito | Biology | The X-Flies | 3/19/2018 | 12/31/2018 |
| 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 |
| 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 | Yule Like This | 12/17/2018 | 12/2/2019 |
| Antonia Franco | Education | Wonder Women | 11/20/2017 | 10/1/2018 |
| Julia Frankenstein | Neuroscience | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| J. L. Galache | Astronomy | Space Rocks | 11/19/2018 | 11/19/2018 |
| Jenna Gallas | Industry | Yule Like This | 12/17/2018 | 12/2/2019 |
| Jay Gallentine | Author | Frogs’ Pants | 7/9/2017 | 7/2/2018 |
| Adam Gazzaley | Neuroscience | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Neil Gemmel | Health/Medicine | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| 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 |
| Eugenia Gold | Health/Medicine | Geology is Destiny | 1/16/2017 | 1/15/2018 |
| Jeff Goodell | Journalism/Technical Writing | New Water Worlds | 8/27/2018 | 5/20/2019 |
| Hank Greely | Law | DNA: Nature’s Hard Drive | 11/6/2017 | 9/17/2018 |
| James Green | Aeronautics/Space | Space: Why Go There | 3/5/2018 | 12/24/2018 |
| Peter Greenberg | Biology | You’ve Got Whale | 10/29/2018 | 6/6/2019 |
| David Grinspoon | Astrobiology | Geology is Destiny | 1/16/2017 | 1/15/2018 |
| David Grinspoon | Astrobiology | Imagining Planets | 6/4/2018 | 6/4/2018 |
| David Gross | Physics | Too Big to Prove | 10/16/2017 | 8/20/2018 |
| John Gruener | Aeronautics/Space | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Julian Guthrie | Journalism/Technical Writing | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Kimberly Hambuchen | Aeronautics/Space | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| Richard Harris | Journalism/Technical Writing | Skeptic Check: Science Breaking Bad | 5/22/2017 | 12/10/12018 |
| Douglas Haynes | History | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Tom Hedberg | Geography | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| Allen Herbert | Industry | High Moon | 4/23/2018 | 3/4/2019 |
| Tina Hesman Saey | Journalism/Technical Writing | Identity Crisis | 7/23/2018 | 4//29/2019 |
| 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 Howarth | Biology | It’s In Material | 10/2/2017 | 7/30/2018 |
| Anthony James | Biology | The X-Flies | 3/19/2018 | 12/31/2018 |
| Sheila Jasanoff | Sociology | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Eugene Kapustin | Chemistry | What Goes Around | 7/24/2017 | 7/9/2018 |
| Scott Kelly | Aeronautics/Space | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Michael Kemp | Earth Sciences/Ecology/Climate Change | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Rob Knight | Biology | You Are Exposed | 5/14/2018 | 3/25/2019 |
| Maria Konnikova | Psychology | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Ilona Kotlewska | Psychology | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Laura Kramer | Education | Yule Like This | 12/17/2018 | 12/2/2019 |
| 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 |
| Phil Lapsley | Author | Plan of a Hack | 9/11/2017 | 9/3/2018 |
| Roger Launius | History | Space Rocks | 11/19/2018 | 11/19/2018 |
| Sean League | Aeronautics/Space | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Janna Levin | Physics | Too Big to Prove | 10/16/2017 | 8/20/2018 |
| Janna Levin | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Dave Levitan | Journalism/Technical Writing | Skeptic Check: Science Breaking Bad | 5/22/2017 | 12/10/2018 |
| Louis Liebenberg | Evolutionary Sciences | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Yonatan Lipsitz | Biology | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Jack Lissauer | Aeronautics/Space | Imagining Planets | 6/4/2018 | 6/4/2018 |
| Alex Liu | Biology | Are Animals Really That Smart? | 12/12/2016 | 1/8/2018 |
| Seth Lloyd | Engineering | Quantum: Why We Want ‘Em | 2/6/2017 | 2/19/2018 |
| Rowan Lockwood | Biology | Shell on Earth | 3/27/2017 | 12/9/19 |
| Avi Loeb | Astronomy | Space Rocks | 11/19/2018 | 11/19/2018 |
| Michel Maharbiz | Engineering | Brain Dust | 12/5/2016 | 4/9/2018 |
| 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 |
| Richard Marlink | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Christopher Mason | Genetics/Genomics | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Cliff Mass | Earth Sciences/Ecology/Climate Change | Weather Vain | 11/21/2016 | 1/1/2018 |
| Lilian Matallana | Earth Sciences/Ecology/Climate Change | Yule Like This | 12/17/2018 | 12/2/2019 |
| Erica McAlister | Biology | The X-Flies | 3/19/2018 | 12/31/2018 |
| Johnjoe McFadden | Author | Quantum: Why We Want ‘Em | 2/6/2017 | 2/19/2018 |
| James McGaha | Astronomy | Skeptic Check: New UFO Evidence | 1/29/2018 | 1/29/2018 |
| Christopher McKay | Planetary Science | Frogs’ Pants | 7/9/2017 | 7/2/2018 |
| Maryn McKenna | Journalism/Technical Writing | Bacteria to the Future | 2/12/2018 | 11/26/2018 |
| 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 |
| Steven Miller | Earth Sciences/Ecology/Climate Change | Weather Vain | 11/21/2016 | 1/1/2018 |
| Greg Milner | Journalism/Technical Writing | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| Mark Miodownik | Technology | It’s In Material | 10/2/2017 | 7/30/2018 |
| Leonard Mlodinow | Physics | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Leonard Mlodinow | Physics | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Peter Moore | Author | Weather Vain | 11/21/2016 | 1/1/2018 |
| Toni Lyn Morelli | Earth Sciences/Ecology/Climate Change | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Oliver Morton | Journalism/Technical Writing | Angles of a Hack | 9/18/2017 | 9/10/2018 |
| Alex Moshakis | Journalism/Technical Writing | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Amy Myrbo | Earth Sciences/Ecology/Climate Change | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| 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 |
| Dava Newman | Aeronautics/Space | It’s In Material | 10/2/2017 | 7/30/2018 |
| Matthew Nisbet | Journalism/Technical Writing | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Peter Norvig | Industry | Meet Your Robot Barista | 2/26/2018 | 1/28/2019 |
| James Oberg | Aeronautics/Space | Skeptic Check: New UFO Evidence | 1/29/2018 | 1/29/2018 |
| Paul Offit | Health/Medicine | Skeptic Check: Heal Thyself | 9/24/2018 | 12/30/2019 |
| Paul Offit | Health/Medicine | Skeptic Check: Science Breaking Bad | 5/22/2017 | 12/10/2018 |
| Ben Orlin | Mathematics | Yule Like This | 12/17/2018 | 12/2/2019 |
| Chad Orzel | Physics | Skeptic Check: Your Inner Lab Coat | 2/9/2015 | 3/26/2018 |
| Roland Pease | Journalism/Technical Writing | Too Big to Prove | 10/16/2017 | 8/20/2018 |
| Rosalind Picard | Computer Science | Perpetual Emotion Machine | 6/19/2017 | 6/18/2018 |
| Phil Plait | Astronomy | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Kara Platoni | Journalism/Technical Writing | Angles of a Hack | 9/18/2017 | 9/10/2018 |
| John Priscu | Biology | On Thin Ice | 8/13/2017 | 7/16/2018 |
| Jani Radenbaugh | Planetary Science | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Ben Radford | Sociology | Skeptic Check: New UFO Evidence | 1/29/2018 | 1/29/2018 |
| Wahltyn Rattray | Astronomy | Hawkingravity | 4/2/2018 | 3/11/2019 |
| Marc Rayman | Aeronautics/Space | It’s Habitable Forming | 8/13/2018 | 6/10/2019 |
| Michael Raymer | Physics | Quantum: Why We Want ‘Em | 2/6/2017 | 2/19/2018 |
| Pradeep Reddy | Health/Medicine | Time on Your Side | 5/8/2017 | 5/28/2018 |
| Eric Rignot | Earth Sciences/Ecology/Climate Change | On Thin Ice | 8/13/2017 | 7/16/2018 |
| Alan Robock | Earth Sciences/Ecology/Climate Change | Weather Vain | 11/21/2016 | 1/1/2018 |
| Kevin Roose | Journalism/Technical Writing | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Peter Rubin | Journalism/Technical Writing | We Are VR | 5/7/2018 | 2/25/2019 |
| Angela Saini | Journalism/Technical Writing | Wonder Women | 11/20/2017 | 10/1/2018 |
| Robert Sapolsky | Neuroscience | Perpetual Emotion Machine | 6/19/2017 | 6/18/2018 |
| 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 |
| Etienne Schneider | Economics | What Goes Around | 7/24/2017 | 7/9/2018 |
| Anita Sengupta | Engineering | What Have You Got to Move? | 3/13/2017 | 4/30/2018 |
| Yin Shen | Neuroscience | DNA: Nature’s Hard Drive | 11/6/2017 | 9/17/2018 |
| Margot Lee Shetterly | Author | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Takanori Shibata | Aeronautics/Space | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Mark Showalter | Planetary Science | Space Rocks | 11/19/2018 | 11/19/2018 |
| Ethan Siegel | Astrophysics | Yule Like This | 12/17/2018 | 12/2/2019 |
| Jamese Sims | Earth Sciences/Ecology/Climate Change | Space: Why Go There | 3/5/2018 | 12/24/2018 |
| Michael Snyder | Genetics/Genomics | DNA is Not Destiny | 10/15/2018 | 7/8/2019 |
| Alan Stern | Planetary Science | Imagining Planets | 6/4/2018 | 6/4/2018 |
| Sam Sternberg | Biology | DNA: Nature’s Hard Drive | 11/6/2017 | 9/17/2018 |
| Nicole Stott | Aeronautics/Space | It’s In Material | 10/2/2017 | 7/30/2018 |
| Tom Szaky | Industry | What Goes Around | 7/24/2017 | 7/9/2018 |
| Al Tanner | Biology | Shell on Earth | 3/27/2017 | 12/9/19 |
| Jill Tarter | Astronomy | Wonder Women | 11/20/2017 | 10/1/2018 |
| Nancy Tomes | History | Skeptic Check: Science Denial | 11/12/2018 | 11/12/2018 |
| Abigail Tucker | Author | Are Animals Really That Smart? | 12/12/2016 | 1/8/2018 |
| Oliver Uberti | Art | Rerouting … Rerouting | 12/18/2017 | 11/5/2018 |
| James Underdown | Sociology | Skeptic Check: Flat Earth | 6/11/2018 | 7/29/2019 |
| Peter Vishton | Psychology | Your Brain’s Reins | 4/10/2017 | 5/21/2018 |
| Peter Wadhams | Earth Sciences/Ecology/Climate Change | On Thin Ice | 8/13/2017 | 7/16/2018 |
| Jessica Ware | Biology | The X-Flies | 3/19/2018 | 12/31/2018 |
| Andy Weir | Author | High Moon | 4/23/2018 | 3/4/2019 |
| Matt Wilkinson | Biology | What Have You Got to Move? | 3/13/2017 | 4/30/2018 |
| Caroline Williams | Journalism/Technical Writing | Skeptic Check: Brain Gain | 8/6/2018 | 8/26/2019 |
| Danielle Wood | Aeronautics/Space | Space: Why Go There | 3/5/2018 | 12/24/2018 |
| Simon “Pete” Worden | Aeronautics/Space | DIY Spaceflight | 1/30/2017 | 1/22/2018 |
| Simon “Pete” Worden | Aeronautics/Space | What Goes Around | 7/24/2017 | 7/9/2018 |
| Ryland Young | Biology | Bacteria to the Future | 2/12/2018 | 11/26/2018 |
| Robert Young | Geology | Skeptic Check: Political Scientist | 4/16/2018 | 3/18/2019 |
| Joon Yun | Health/Medicine | Time on Your Side | 5/8/2017 | 5/28/2018 |
| 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 |
