Jess Phoenix (@jessphoenix2018), author of the new book Ms. Adventure: My Wild Explorations in Science, Lava, and Life joins Matt and Andy to talk about all things volcano-related, her education and outreach organization Blueprint Earth, lava tubes, her upcoming show about Atlantis... and whether Dante's Peak is better than Volcano. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free trial with unlimited access PLUS $30 off when you sign up for an annual plan by visiting TheGreatCoursesPlus.com/probably

Comedian Dana Eagle (@DanaEagleTweets) joins Matt and Andy to discuss the latest on Desert Tony's health, the world's oldest computer, mechanical gears found in nature, sea slugs that survive self-decapitation, a change of heart from a former head/body transplant candidate and Dana's book How To Be Depressed. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free trial with unlimited access PLUS $30 off when you sign up for an annual plan by visiting TheGreatCoursesPlus.com/probably

Comedian, author and now cryptic crossword setter Dave Gorman (@DaveGorman) joins Matt and Andy to discuss the world of cryptic crosswords, standup about math(s), cuttlefish that pass the marshmallow test, words that are their own antonyms, testing the efficacy of psychedelic microdosing, creativity testing, Andy's favorite Tracey Ullman sketch, glow-in-the-dark sharks, the New Zealand tsunami that wasn't, counter-illumination, a swarm of earthquakes under Mt. Hood, and Dave's many shows including Modern Life Is Good-ish. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free trial with unlimited access PLUS $30 off when you sign up for an annual plan by visiting TheGreatCoursesPlus.com/probably

Comedian and analytics consultant Sarah Dorfman (@SarahPDorfman) joins Andy and Matt to discuss asking a ton of whys, magnetic pole flips and killing neanderthals, trees showing pole flips, India's lake of skeletons, the first photograph ever, the hidden message in Perseverance's parachute, AI conquering '80s video games, and little Jack Black in an ad for Pitfall.

Comedian, podcaster and author of the upcoming book The History of Standup Wayne Federman (@Federman) joins Matt and Andy to discuss the original location of Stonehenge, why its construction might not have been that hard, transparent wood that's stronger than glass, whether glass is a liquid or not, training pigs to use joysticks and what the future holds for standup comedy. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free 14-day trial with unlimited access by visiting TheGreatCoursesPlus.com/probably

Comedian and podcaster Brandie Posey (@Brandazzle) returns to the show to talk about hosting celebrity karaoke and ending up on TMZ, more details on how wombat poop ends up cubed, a quick refresher on platonic solids, Brexit and bees, Wandavision, the insane amount of power consumed by Bitcoin and quantum encryption in space.

Comedian April Richardson (@apey) of the podcast Why Do I Like This? returns to the show to chat about moving to England, the smallest reptile on Earth, hibernation in early humans, teaching spinach to send emails, Tiny Elvis and the Wilhelm Scream. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free 14-day trial with unlimited access by visiting TheGreatCoursesPlus.com/probably

Comedian/musician Eli Braden (@EliBraden) returns to the show to discuss stonks, the Robinhood fiasco, PredictIt.org, The Hustler, Psycho Goreman, more dinosaur butthole developments, Colgate University, Perseverance's upcoming Mars landing and evidence of multiple Mars ice ages.

Comedian and actor Marcus Brigstocke (@marcusbrig) joins Andy and Matt to discuss blowing things up in school, puckle guns, coordinated electric eel attacks, solving the mystery of butterfly flight, separating dire wolf fact from fiction and giving shrooms to pigs.

Nobel laureate Frank Wilczek (@FrankWilczek), author of the new book Fundamentals: Ten Keys to Reality, joins Matt and Andy to talk about the work that earned him a Nobel Prize, as well as his book, which delves into the essential concepts that form our understanding of how the universe works, digging into fundamental ideas like time, space, matter, energy, complexity and complementarity. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free 14-day trial with unlimited access by visiting TheGreatCoursesPlus.com/probably