Why do capybaras have such big teeth? Adrian had to know! To get to the bottom of this, we spoke to a biologist named Santiago Herrera Alvarez. Capybaras are Internet sensations, and Santiago can't get enough of them! Santiago's questions were even bigger than capybara teeth: how did capybaras, a relative of rodents like mice and rats, get to be so enormous? Tune in for a capybara rodeo, and stick around to find out how one little animal can grow to superstardom.

Want to learn more? Go visit us at sciencepodcastforkids.com for videos, resources, and so much more about the world's biggest rodents! If you want to support Tumble on Patreon, go to patreon.com/tumblepodcast.

This material is based upon work supported by the National Science Foundation under Grant Number # 2415575 - Culturally Situated STEM Podcasts for Kids.

How does vision work? That’s what Junie wants to know. And is it possible to create vision for people who don’t see? We’ll dive into the mysteries of how we see with Lucas Nadolskis, a scientist who became blind when he was five. Lucas is studying how vision works in the brain to understand if it’s possible to see without using your eyes! Intrigued? Listen in to find out more of the mysteries behind the science of vision!

This material is based upon work supported by the National Science Foundation under Grant Number # 2148711 - Engaging Blind, Visually Impaired, and Sighted Students in STEM with Storytelling through Podcasts.

Why are there so many axolotls in fishtanks, and so few in the wild? That’s what Maximiliano wants to know. You may have found axolotls in the lush caves of Minecraft, but in real life, they live in the lakes and canals of Xochimilco, near Mexico City. But the species is slowly disappearing from its native habitat. Axolotl veterinarian Horacio Mena takes us on a journey to Xochimilco to find out what scientists are doing to save these adorable amphibians.

This material is based upon work supported by the National Science Foundation under Grant No. 2415575.

Happy New Year! This is a rebroadcast of “Polar Bear Adventure” from Season 8!

Join us on an Arctic adventure as we head out onto the sea ice with a polar bear scientist! Andrew Derocher shares exciting stories of flying in helicopters, getting bit by a polar bear cub, and discovering how polar bears are surviving in a warming world.

Andrew explains what happens when polar bears move into human towns, in the bonus interview episode. It’s available to Patrons who pledge just a dollar or more a month on patreon.com/tumblepodcast.

Teachers! Find a toolkit to share polar bear science with students, on the World Wildlife Fund’s WildClassroom.org. A transcript for this episode and other resources are available on the blog on our website, sciencepodcast.com

Happy holidays! This is a rebroadcast of our chilly Season 7 episode, The Great Seal Count.

How do you count the cutest seals on the planet? With the help from thousands of people around the world! Conservation scientist Leo Salas explains the story behind the first-ever global count of Weddell seals in Antarctica. Plus, you’ll find out what counting seals shares with searching for ancient tombs!

Learn more about Weddell seals in our special bonus episode with Dr. Leo Salas, available to Tumble Patrons who pledge just $1 or more a month - along with an ad-free episode feed! Support us today at patreon.com/tumblepodcast.

We’ll have free resources to learn more about Weddell seals (or the ‘widdle Weddells’) on the blog on our website, sciencepodcastforkids.com.

Do you speak Spanish, or are you a Spanish language learner? Subscribe to Tumble En Español to listen to episodes adapted to Spanish! 

Weddell seal recordings in this episode were obtained under NMFS Permit No. 1032-1917.

This is a rebroadcast of one of our favorite episodes from Season 8!

When did smartness begin? We’ll find out how a neuroscientist blends up brains, and cracks the case of the Tyrannosaurus Rex smarts! Suzana Herculano-Houzel helps us answer listener Penny’s question by explaining how “smartness” might not mean what you think - and how all animals have shown off their intelligence over time.

Listen to our bonus interview with Suzana on our Patreon when you pledge just $1 a month or more! patreon.com/tumblepodcast.

Learn more about Suzana and her work on the evolution of intelligence on the blog on our website, www.sciencepodcastforkids.com.

This is a re-airing of our award-winning episode The Swift Quake! This episode won the AAAS Kavli Silver Medal Award for excellence in Children's Science News, as well as a Signal Award for kid's podcasts. Give it a listen!

How do you think a stadium full of Taylor Swift fans would shake the earth? Tumble enters the Swiftiverse with Jackie Caplan-Auerbach, the scientist who discovered the “Swift Quake” - a type of earthquake created by fans at Taylor Swift concerts. Find out who really “shakes it off” - when it comes to music and seismic energy.

If you'd like to support Tumble, there's more than one way to do it! You can join our Patreon and get birthday shout outs if you support us at the $5 level or higher. You can also consider donating to our new non-profit organization, Tumble Education Inc.! Our aim is to support freely accessible, high quality educational audio content. Just go donate here.

What does it feel like to be in space? That’s what Elijah wants to know. So we’re taking off on a zero-gravity flight to find out! Guest reporter Jason Strother shares the story of Sheri Wells-Jensen, a blind scientist who is paving the way for people with disabilities to go to space. 

This material is based upon work supported by the National Science Foundation under Grant Number # 2148711 - Engaging Blind, Visually Impaired, and Sighted Students in STEM with Storytelling through Podcasts. 

Learn more about Sheri on the bonus interview episode on our Patreon, at patreon.com/tumblepodcast. 

Check out the blog on sciencepodcastforkids.com for more info!

Are cats evil? Are they hatching a plot to take over the world? Or are they just misunderstood? Scientist and cat expert Mikel Maria Delgado will tell us how the domestication of cats and dogs changed the way we think of our pets today, and she’ll explain how scientists of all ages can study cat preferences (or purr-fur-ences). Plus, she’ll share some tips on cat do’s and don’ts, so we can learn how to be better friends to our kitty companions.

For more information about Mikel and more on cat science, visit our website at sciencepodcastforkids.com, where we'll have resources, videos, and more.

For ad-free versions of the episode and a birthday shout-out, go support Tumble on Patreon at patreon.com/tumblepodcast.

How do species evolve? Find out in the shocking conclusion of our Monkeyflower mystery series! Plant biologist David Lowry has been tracking down clues to solve the question of why plants look different - and the yellow monkeyflower is more than a suspect. Now, it’s time to take his detective skills up a notch, and use the science of DNA. A twisted discovery will flip the case - and lead to a new chapter in understanding how life evolves. 

Hear more from our interview with David, on the special bonus interview episode that’s available to Patreon members who pledge at the $1 level or higher at patreon.com/tumblepodcast. 

Check out David’s monkeyflower mystery comic book on our blog at sciencepodcastforkids.com! 

This material is based upon work supported by the National Science Foundation under grant 2153100: IMAGiNE: The genetic, developmental, and physiological mechanisms of plant local adaptation to oceanic salt spray.