Matt and Andy traveled to downtown LA's Pershing Square and City Hall to take part in the March for Science, along the way speaking with various groups who had set up booths for the event, and even a neuroscientist listener who took the time to chat about her work giving cocaine to mice.

Don't forget that Probably Science (and Andy and Matt individually) will be performing live at Portland's Bridgetown Comedy Festival on May 7th. Get your festival passes now at bridgetowncomedy.com

Married comedians Mary Mack (@marymackcomedy) and Tim Harmston (@timharmston) sit down with Andy and Matt to talk about Frog rockets, orchestral doubling, Army band status, Guy Fawkes, accidentally melting science, dinobirds, kids with beaks, triple yolks, yogurt toppings economics, the book-stacking problem and why shoelaces come untied.

Comedians Bryan Vokey (@BryanVokey), Carmen Morales (@thefunnycarmen) and TJ Chambers (@tjchambersLA) join Andy and Matt to discuss Georgia creationism, sperm-delivered drugs, erogenous T-Rex noses, geological Brexit, Segways on boats, Andy's mathematics puzzle, hamsters on Viagra and how memories are made.

Returning guest Henry Phillips (@henlips) of Punching Henry fame sits down with Matt and Andy to discuss graphene water filtration, a real-life (sort-of) Iron Man, funny foreign names, CT scan risks, CTs vs. MRIs, biologics, dumb/smart interview questions and the probability of rude names happening randomly.

Comedian MK Paulsen (@mkpaulsen) joins Matt and Andy to talk about Crazy Frog, public policy, October Sky, RIP radioactive boy scout, a heart of spinach, German fake suns, beating cancer and stopping aging, corrections corner, Andy's new swim teammate, strep, the Ten Commandments, tits on Nazis and chimp death rituals.

Comedian Phoebe Bottoms (@phoebebottoms) and returning guest TJ Chambers (@tjchambersLA) join Andy and Matt to discuss the Boaty McBoatface submarine, sirens and pigs, breaking up with your physics teacher, naughty snooping dildos, microphones in your pocket, why avoiding gluten might hurt you, unvaccinated Australians, OCD, which animals you can't keep as pets, why plastic is still bad, why licking video games is no fun anymore, Egg-wina and pee danger.

Hot on the heels of her recent Tonight Show appearance, comedian Candice Thompson (@jokesbyCandice) joins Matt and Andy to talk about Punching Henry, the movie Matt is in with Henry Phillips, ASMR, Richard Simmons, anti-Brit racism, what zoo animals taste like, Neanderthals' medication, mini-pigs and films about them, iCondoms, 3D printing medical supplies and pizzas, swimming pool pee and dog fMRIs.

Comedian and actor Johnny Pemberton (@johnnypemberton) of Son of Zorn joins Matt and Andy to discuss water shortage solutions and Indiegogo lies, pipe bombs, ulcerative colitis, money you can piss on, a better way to crowdsource, training bees to play with balls, chiropractic, more opinions on cats and toxo, saving polar ice and eating da poo-poo.

Comedian Kate Willett (@katewillett) joins Andy and Matt to talk about NASA's big exoplanet announcement and Episode 70 of our show discussing exoplanet research, the twin paradox, twin astronauts, fake Twitter accounts, a study showing that cats may not make you crazy, and a chiropractor's creative menstrual invention.

Comedians Ever Mainard (@evermainard) and Deborah Etta (@deborah_etta) join Andy and Matt to talk about scientific weirdos and Galois, starfish and STDs and regrowing dicks, finger regrowth, Matt's awful ex, why whales jump, unethical kitten experiments, science fairs gone wrong, more blood and shit stuff, moon stuff and monkeys and dogs judging cooperation in humans. This episode is brought to you by Audible. For a free 30-day trial, visit audible.com/psp.