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Is time travel possible?

Who hasn’t dreamed of going to the past or taking a peek into the future? This episode takes a look at the ins and outs of time travel. 


Will we ever get to rewind time, or fast forward through it? Sanden stops by to tell us all about how time works. He also has a couple ideas about how we might make time travel a reality! But one tricky thing about time travel is that it’s full of paradoxes — so we look into those, too. And science fiction expert Lisa Yaszek swings by to tell us just how long humans have been thinking about time travel (hint: a really long time).Listen closely for the mystery sound, and the moment of um: how do clothes get dirty even though you can’t see it?

Is time travel Possible?

Mystery Sound Extravaganza 2021

How many Mystery Sounds can you guess? How many can you handle?!?


What's that you hear? That's right, It's an episode of nothing but mystery sounds! Are your ears up to the challenge? Plus, we'll hear an answer to the question: "How do squirrels find their nuts after they bury them?"
If you'd like to submit a mystery sound, you can share it with us here: brainson.org/contact
And you can support the show at brainson.org/fans
You can also buy our book, complete with Mystery Photos, at brainson.org/shop or at your favorite local bookstore

Why are smartphones so hard to put down?

Screens are everywhere these days! We’re taking a look at why smartphones are so addictive, and how our devices affect us. Our co-hosts took on a bold challenge for this episode: they went a week without phones or tablets. We’ll hear how their experiment went, then Sanden will fill us in on the brain chemical that trains us to love our screens.


Screens are everywhere these days! We’re taking a look at why smartphones are so addictive, and how our devices affect us.

Our co-hosts took on a bold challenge for this episode: they went a week without phones or tablets. We’ll hear how their experiment went, then Sanden will fill us in on the brain chemical that trains us to love our screens. We'll also learn why the predictability of messages and alerts on smartphones makes them extra hard to put down.

Plus, we’ll get a few tips from Catherine Price, the author of How to Break Up With Your Phone.

And! A new moment of Um: why are bruises blue, and how do we get them?

Screens are everywhere these days! We’re taking a look at why smartphones are so addictive, and how our devices affect us. Our co-hosts took on a bold challenge for this episode: they went a week without phones or tablets. We’ll hear how their experiment went, then Sanden will fill us in on the brain chemical that trains us to love our screens. We'll also learn why the predictability of messages and alerts on smartphones makes them extra hard to put down. Plus, we’ll get a few tips from Catherine Price, the author of How to Break Up With Your Phone. Price has more resources for screen time habits at https://phonebreakup.com/. And! A new moment of Um: why are bruises blue, and how do we get them? This episode is sponsored by "The Last Kids on Earth" by Max Brallier, available wherever books are sold, and Quip (getquip.com/brainson). You can support the show at brainson.org/donate

Brains On Podcast

Smash Boom Best is a debate show for kids and families from the makers of the award-winning podcast, Brains On! Every episode takes two cool things, smashes them together and lets you decide which is best.


Smash Boom Best

Julie and her daughter, children’s author and educator Emma Walton Hamilton, invite you into their library to read their favorite children's books. Every story comes to life with sound, music and activities. Authors, kids and other special guests chime in, too! 


Julie's Library

A history show for the whole family! Every episode explores the origin of just one thing — like sandwiches, video games, clocks and more — while teaching listeners to think critically about history.


Forever Ago

Other APM Podcasts

Want to learn Spanish or build up your bilingual brainpower? This is a great place to start! Puedes escuchar al podcast aquí.


Brains On en español

Listen to all the episodes in our series on the coronavirus, get resources and more.


Coronavirus Episodes and Resources

Molly, Marc, and Sanden present a humorous, fact-and fun-filled look at life on Earth — from deep-sea creatures and carnivorous plants to the human body and stinky bacteria. Get your own copy to explore!


Brains On

Welcome to Brains On!

Recent Episodes