Comedian and host of the radio show/podcast You're the Expert Chris Duffy (@youretheexpert) joins Matt and Andy to talk about rats driving cars, why measles is bad, the book Antisocial, fake news in Argentina, beavers on the moon, eagles racking up roaming charges, a thermal camera that spotted cancer, Google's quantum supremacy and the guy who coined the term, brewing beer in your stomach and why breathalyzers aren't to be trusted.

Artificial intelligence researcher and UC Berkeley Professor of Computer Science Dr. Stuart Russell joins Andy to talk about his new book Human Compatible: Artificial Intelligence and the Problem of Control, which explores the concept of intelligence in humans and machines, what the benefits and drawbacks of creating superhuman intelligence are, and what AI researchers can do now to help usher in a future that's more utopian than dystopian.

Comedian-turned-writer Daniel Dominguez joins Matt and Andy to talk about his new animated Netflix series Seis Manos, Nobel Prize announcements in physics, medicine and chemistry, Ursula K. Le Guin, people with Goodenough names and implanting false memories in birds. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access to thousands of lectures by visiting TheGreatCoursesPlus.com/probably

Comedian Troy Walker (@troywalkeresq) joins Matt and Andy to discuss erector sets, owl pellets, scientists growing tooth enamel, aspen sunscreen, a Milky Way explosion, Dr. Magma, too many wallabies, university ripoffs and antibiotic resistance. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access to thousands of lectures by visiting TheGreatCoursesPlus.com/probably

Comedian Matt Monroe (@heymonroe) joins Andy and Matt to discuss retirement community shows, Sandler on Netflix, the Salton Sea, the toilet water scale, Terence Howard science, lizard womb babies, lady rabbit orgasms, Sarah Morgan's web series, a tooth bird fossil, Matt Monro and Born Free.

Comedian Nick Turner (@NicksTurners) returns to the show seven years after his last appearance to talk about his podcasts Get Rich Nick and Recently Added, walking dogs, very slow zombies, a herpes vaccine, fun math with 3s, a new blackest black, Instant Hotel, cooking with ostrich eggs, Instant Hotel, Fastest Car and Hyperdrive, spiders flying with electricity and a play with a very controversial name. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access to thousands of lectures by visiting TheGreatCoursesPlus.com/probably

PhD-having comedian Ria Lina (@rialina_) joins Matt and Andy to talk about bioinformatics, her research in viruses, specifically the herpes family of viruses, predicting this year's flu, the definition of life, the other kind of beach bodies, pathology, terrorism hypotheticals, herd immunity, viral ontology and Ria's ukulele song for Alabama. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access to thousands of lectures by visiting TheGreatCoursesPlus.com/probably

Comedian Nick Vatterott (@vatterott) of the new podcast Get Rich Nick joins Andy and Matt to discuss trivia, trypophobia, obscenity trials, mouthwash vs. exercise, vape deaths, Stackenblocken, a skull discovery, Lucy and whether there is a gay gene.

Cartoonist/author/engineer Randall Munroe of the Hugo Award-winning webcomic xkcd joins Matt and Andy to talk about his new book How To: Absurd Scientific Advice for Common Real-World Problems, in which he gives novel, ridiculous and technically correct tips on doing everything from digging a hole to winning an election. You can catch Randall in person on his book tour running through September 19th.

Comedians Chris Martin (@ChrisMcomedy) and Hanna Stanbridge (@HannaStanbridge) join Andy and Matt to talk about our Wired video, soap on a rope, some scientist listeners’ corrections, burp-free cows and seaweed, July being the hottest month ever, how tongue rolling isn’t fully genetic, vaccine-delivering Congo drones, asparagus pee, boney boners, Will Smith’s penis, water-powered space craft and peeing in space. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access to thousands of lectures by visiting TheGreatCoursesPlus.com/probably