Writer Sam Pasternack (@SamPasternack) of The Podcasternack joins Matt and Andy while riding his quarantine exercise bike to discuss the real toilet paper problem, bomb tests and whale shark ages, a VERY personalized toilet, an unexpected downside of planting trees, a Mercury mission that just got underway and a five-year time lapse of its path to Mercury orbit.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners three months of unlimited access for only $30 by visiting TheGreatCoursesPlus.com/probably

Comedian/actor Danny Jolles (@DannyJolles) joins Andy and Matt to discuss celebrity centers, political science, the astrophysicist who got magnets stuck up his nose, arm hickeys, mouse emotions, finding Clooneys when stressed, neanderthal fishing, ancient Australian fossils, wrestler Mae Young, Danny's podcast Everything But The Scores and Brooks' ridiculous one-man hungover marathon.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners three months of unlimited access for only $30 by visiting TheGreatCoursesPlus.com/probably

Comedian Grant Lyon (@grantlyon1) returns to the podcast on the heels of the release of his new album "Scheduled Fun Time" to talk about "Imagine" parodies, a Mars lander hitting itself with a shovel, NASA accepting applications, genetically modified neurons and implants, Earth's tiny new moon, Grant's astronaut neighbor and an animal that doesn't need oxygen to survive.

Dr. Barry Fox is a Clinical Professor of Infectious Disease at the University of Wisconsin School of Medicine and Public Health. He also teaches An Introduction to Infectious Diseases on The Great Courses Plus, which turns out to be a very timely lecture series right now. Dr. Fox talks with Matt and Andy about infectious disease in general, and COVID-19 in particular, while helping clarify what we do and don't know about the pandemic in which we find ourselves. For up-to-the-minute coronavirus information, Dr. Fox recommends the CDC, the New York Times and the Wall Street Journal. Visit TheGreatCoursesPlus.com/probably to access Dr. Fox's course and hundreds of others.

Comedian/actor Langston Kerman (@LangstonKerman, Insecure, South Side, Bless This Mess) joins Matt and Andy for a COVID-19 quarantine edition of the podcast, discussing oceanography, subterranean chlamydia, raining molten iron, bike speed records, tiny dinosaurs, mammoth bones, forbidden fruit and insect butter.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access by visiting TheGreatCoursesPlus.com/probably

Comedians Sharon Mahoney (@sharonmahoneyca) and Byron Bertram (@byronbertram) join Matt and Andy to discuss glowing amphibians, COVID-19, Pence's spotty record, the Halifax Explosion and molecular oxygen being found beyond the Milky Way.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access by visiting TheGreatCoursesPlus.com/probably

Barry Rothbart (@barryrothbart) returns to Probably Science eight years after his last appearance to discuss Scorcese films, Mad Mike Hughes, an autism apology, COVID-19, relative risks and vaccines, expensive cars and being a dick, electricity from thin air, seatbelt laws and lives saved and bomb-sniffing locusts.

Video game writer/narrative director and VR advocate Rob Yescombe (@robyescombe) joins Matt and Andy to discuss 90s computer games on TV, Gamesmaster with Take That, Oculus Quest, inside-out tracking, parallax, light field cameras, volumetric video capture, Surinder Rattan's The Lick, making the VR whodunit The Invisible Hours and the game RiME.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free month of unlimited access by visiting TheGreatCoursesPlus.com/probably

Writer/producer Krister Johnson (@KristerJohnson) joins Matt and Andy to discuss his hilarious new Netflix show Medical Police, God's Pottery, Matt LeBlanc and a very specific accent, virus-naming, radiation-eating fungi, autism and myelin, extreme knitting and walking sharks.

Comedian Ed Salazar (@edasalazar) joins Andy and Matt to talk about the new Goop show, Marianne Williamson's disease theories, yoga scammers, Catholic workouts, Einstein being right again, Mercury retrograde explained, YouTube Wired experts, dorking out on musical intervals, more giant horrendous creepy-crawlies, the upcoming show The Great Debate and koala balls.

This episode is brought to you by The Great Courses Plus, offering Probably Science listeners three months of unlimited access for only $30 by visiting TheGreatCoursesPlus.com/probably