The hilarious Jesse Popp (@JessePopp) joins Matt and Andy to talk about his former life as a blackjack card-counter, a newly discovered tessellating pentagon, Penrose tiling, Fermat's Last Theorem, space lettuce, giant marrows, angry people in local newspapers, pumpkins smashing cars, a goat-throwing festival, dreamy eye movements, brain-scanning software, Hannibal's mask prototypes, brain dipsticks and trepanning. Don't forget to visit LAPodFest.com to get tickets to watch Probably Science in person in Los Angeles on September 19th, or buy access to the festival's live video stream and save $5 with the code SCIENCE.