Your teeth are like a squad of superheroes inside your mouth. They help you crunch on carrot sticks, nibble popcorn and chew bubblegum. You’ve probably heard it’s important to brush your teeth to prevent cavities. But what is a cavity? And how do dentists fix them?

Join Molly and cohost Aya on a terrifically toothy adventure, as they explore what causes these pesky little holes in our teeth. They’ll meet a group of rowdy, party-loving bacteria and find out how sometimes, troublemaker bacteria in our mouths can cause cavities. Plus, dentist Dr. Jean Star will help explain how to fix cavities. All that, plus a brand new Mystery Sound!

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

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This episode was sponsored by

Sitka Seafood Market - Use promo code Molly35 to receive $35 off your first order.

See omnystudio.com/listener for privacy information.

Producers Rosie duPont and Aron Woldeslassie are at the Brains On petting zoo checking out some of the cutest baby animals in the world. It’s there that Rosie realizes that they should play a round of Baby Mystery Sounds! It’s the classic Brains On game Mystery Sound with an adorable twist!

See omnystudio.com/listener for privacy information.

Listener Gideon sent in this brilliant question: “How did ferns survive the dinosaur extinction and are they the same ferns we see now?” Our search for the answer will introduce us to James Frond, international fern of mystery, and take us flying through the air on an airplane’s wing. We’ll also meet a scientist who’s trying to understand how ferns are such strong survivors — by recreating the extinction event that wiped out the dinosaurs! All that, plus a fern-tastic new mystery sound!

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

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Today’s episode is sponsored by:

•  Sitka Seafood Market - Use promo code Molly35 to receive $35 off your first order.

See omnystudio.com/listener for privacy information.

Dig in with Molly and co-host Audrey as they learn about our extinct ancient relatives, the Neanderthals! With archaeologist and Brains On producer Anna Goldfield as their guide, they’ll learn how Neanderthals were once misunderstood, and how scientists are learning more about them. Explore the wondrous NeanderHALL at Brains On HQ and unearth the truth about these prehistoric humans with Anna and her talkative NeanderDOLL, Paul! Plus, discover the origins of a tricky new mystery sound

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

See omnystudio.com/listener for privacy information.

Sparklemuffin, turdus maximus, and sarcastic fringehead. These are the names of some of Marc’s favorite animals! Will Molly be able to guess what kind of animals they are?

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Grab your raincoat, and join Molly and co-host Lily as they float into the clouds to learn about lightning! They’ll explore how lightning is made and what it takes to stay safe during thunderstorms. To close with a bang, Molly will slip on her Thunderpants and host an electrifying lightning-themed game show. But don’t bolt too soon. We’ve got a mystery sound reveal that promises to shock!

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

See omnystudio.com/listener for privacy information.

The Brains On crew is hard at work on our next batch of episodes, and we'll be back in your feed on January 16, with an electrifying episode about lightning.

Until then, check out our history show: Forever Ago. It's hosted by our friend Joy Dolo, and it looks into the fascinating past of things we take for granted.

In this episode, Joy invites Molly on to the show to share the origin story of Superman that you've probably never heard. Take a listen!

To hear the entire episode, search for “Forever Ago” wherever you listen to podcasts or head to foreverago.org.

See omnystudio.com/listener for privacy information.

Grab your traveling gear because Brains On and Smash Boom Best host Molly Bloom and Forever Ago host Joy Dolo are going on a road trip. Not only will this be a fun-filled video romp with two buddies cruising the highway, but this trip has a theme that everybody loves: SNACKS!

Mmmmmm, yum! The third Brains On Universe Field Trip is called, what else, Snacktacular Roadtrip, and you’re invited! Molly and Joy will be joined by Sanden and Marc as they cruise through a history of sandwiches, discover what beaver butts have to do with slushies and check out a Smash Boom Best debate between ketchup and maple syrup. Plus, someone from the Brains On Universe will join in live, at the end of the show, to answer questions, play some Mystery Sounds and tell you who won the debate. Whoa!

Tickets are $19.99, and there’s a 20% offer if you’re a Smarty Pass member. Spots are limited, but we have multiple dates and times to choose from. Head to brainson.org/fieldtrips to get the details.

Join Molly Bloom and co-host Ishalo as they learn about the ingredients we need to grow – and why sometimes the growing seems slow! They’ll chat with Dr. Diva de León Crutchlow about sleep and hormones and help Sanden take care of Dwayne the 5-year-old brain. Is your excitement growing by the minute? Ours too! And we’ve got another tricky mystery sound, just for you.

This episode was sponsored by:

Indeed (Indeed.com/BRAINS) - Claim your $75 sponsored job credit to upgrade your job post. Terms and conditions apply.

Factor (Factormeals.com/brainson50) to get 50% off.

IXL (IXL.COM/FIELDTRIP) to get a 20% off an IXL membership.

Wish (movies.disney.com/wish - Only in theaters November 22, tickets available now. Rated PG, parental guidance suggested)

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

See omnystudio.com/listener for privacy information.

Join Molly and co-host Arjun on a reptilian romp, where they learn all about chameleons’ color-changing abilities, powerful eyes, and super sticky saliva. Along the way, they’ll be joined by a pair of chatty chameleon cabaret performers — Kiki and Paul — and chameleon expert Chris Anderson! Color yourself excited for this awesome creature feature, and an all-new mystery sound!

If you want to learn more about chameleons, check out co-host Arjun’s own podcast, Animals Rule! He has an episode all about these loungey lizards, plus a ton of other amazing animals: https://spotify.link/KZrepYscSDb

This episode was sponsored by:

Indeed (Indeed.com/BRAINS) - Claim your $75 sponsored job credit to upgrade your job post. Terms and conditions apply.

Factor (Factormeals.com/brainson50) to get 50% off.

IXL (IXL.COM/FIELDTRIP) to get a 20% off an IXL membership.

Do you have your Smarty Pass yet?? Get yours today for just $4/month (or $36/year) and get bonus episodes every month, and ad-free versions of every episode of Brains On, Smash Boom Best, Moment of Um, and Forever Ago. Visit www.smartypass.org to get your Smarty Pass today!

See omnystudio.com/listener for privacy information.