Actor/director Pollyanna McIntosh (@PollyAMcIntosh) of The Walking Dead, Lodge 49 and her directorial debut Darlin' joins Matt and Andy to discuss Dennis dentists, human-sized penguins, gay penguins with an egg, an ebola cure, good environmental news, bad environmental news and tails for old people. 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 Joyelle Johnson (@joyellenicole) joins Andy and Matt to talk about doctor rules, chlamydia vaccines, AI that can spot bad food, our surprisingly old moon and an excellent Fidel Castro conspiracy theory.

Comedian Jordan Doll (@razorlou) joins Andy and Matt to discuss old UK comedy, field archaeology, being a shovel bum, King Arthur’s various swords, massive parrots, the periodic table of Jeopardy!, tardigrades on the moon, disinfecting Mars, water-filtering wood, toxic Paris, Maya Angelou ads, problematic pics and The Mechanical Turk. 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 KT Tatara (@kttatara) joins Matt and Andy to talk about a CRISPR sickle cell cure, a mysterious radiation leak linked to Russia, Mr. Wizard, Bob Lazar and UFOs and bees' sense of the electric fields of flowers. 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 Francisco Ramos (@FranciscoRamos) joins Andy and Matt to discuss thermos technology, socialism, whether canned laughter works, an asteroid close call, quantum teleportation and an HIV cure for mice.

Comedian and recent Portland transplant Caitlin Weierhauser (@UncleCait) joins returning guest TJ Chambers (@tjchambersLA) to talk about the surprisingly extensive history of McDonaldland characters, how dogs' eyes evolved to appeal to humans, a notably droopy dog breed, a recently scrapped Indian space mission, female jockeys being underestimated by the betting public , a recent study critical of psychiatric diagnosis and a magical island where the koalas are free of chlamydia. 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

Jacob Margolis (@JacobMargolis), KPCC science reporter and host of the podcast The Big One, talks with Andy about the two recent major California earthquakes, what they mean for those living on nearby faultlines, what to do to prepare yourself for future quakes, FEMA's earthquake safety checklist, Jacob's supply shopping list and and his podcast detailing the repercussions of a hypothetical catastrophic earthquake in Los Angeles. 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

Population geneticist Dr. Alex Platt joins Matt and Andy to discuss the complex world of genetics and its role in shaping humans the world over, also dealing with the many misconceptions and blind spots people have about genetic diversity and the history of the human species.

Actress/writer Susy Kane (@kusysane) joins Matt and Andy to talk about Stan & Ollie, eating a credit card's mass in plastic, a dubious claim about plastic straws, Canada's plastic ban, ISS tourism, InSight news, ladybug swarms and pterodactyls flying from birth.

Comedian Bri Pruett (@bripruett) joins Andy and Matt to discuss the invisible world, witchy things, a mosquito-killing GM fungus, saving the wasps, anxiety and gut bacteria, making kombucha, real plastic recycling and the resilience of tardigrades. See Matt in NYC next week. This episode is brought to you by Green Chef. For $75 off your first three orders, visit greenchef.us/psp75.   Come and see Matt in NY next week!