A long time ago, in a galaxy far far away… we wondered, could you ever build a real lightsaber like the ones in Star Wars? A lightsaber is a glowing sword that can cut through metal – and pretty much anything else you can think of. It’s the favorite tool of heroes like Luke Skywalker and Ahsoka Tano, as well as villains like Darth Vader. That’s just in the movies, but could we make them real? We asked mechanical engineering professor Sayan Biswas to help us find the answer.

Got more questions than Luke when he was training with Yoda? Send them to us at BrainsOn.org/contact, and we’ll help use the force to find an answer!

We’re back! We’ve officially moved into our new headquarters! Come unpack with us and get a tour while we fill you in on some big news. Plus, new episodes of Brains On coming later this month and new Smash Boom and Forever Ago after that. If you want to support the show or drop us a line, head to brainson.org. The best way to keep us going is to join Smarty Pass or donate here: https://brainson.supercast.com. Thank you!

See Smash Boom Best LIVE in Princeton, NJ!

Join us at the McCarter Theatre for a live, in-person version of Smash Boom Best, an award winning podcast for kids and families! Each live show takes two cool things, smashes them together and lets the audience decide which is best. Host Molly Bloom moderates a debate between two performers who make their case using facts fueled by jokes, physical comedy, and the occasional song and dance. At the end, the audience votes for the winner and crowns the Smash Boom Best – all while learning how to defend their own opinions and make the strongest arguments for their case.

While we are in town, we are throwing a Smash Boom Spectacular Party right after the live show and YOU are invited! This won't be just any party. You will get to meet host Molly Bloom and our debaters. They'll be playing games with you, singing songs, answering your questions, and posing for photos. Plus, you'll get to take home an awesome, one-of-a kind Smash Boom Best goodie bag. You can gain access to this SBSP (Smash Boom Spectacular Party) by purchasing a VIP ticket* when you make your purchase. See you there!

DETAILS & TICKETS

McCarter Theatre Center

October 26, 2025 at 3:00pm ET

91 University Place

Princeton, NJ 08540

Buy Tickets Here

We're moving the Brains On Universe Headquarters, and that means we have to stop putting out new episodes until we get settled. We know: not cool. But, our new home is going to be bigger and better and the absolute BEST. We can't wait until it's ready for you to visit.

In the meantime, we still have some live shows planned this fall. Brains On Live will be in Dallas, TX on September 13. And Smash Boom Best will bring the debate heat to Princeton, NJ on October 26. Head over to brainson.org/events to get tickets. We can't wait to high five you all in person!

And, if you want to be the first to hear about our shiny, new home, sign up for our newsletter. There will be six more bathrooms, 10 more water slides and, we're finally going to fix the doorbell! Also, if you have any questions or want to reach out to us, you can still head to brainson.org/contact to get in touch.

They come in cool colors, catch popcorn kernels and sometimes even have spacers - it’s braces! Ever wondered how braces magically straighten teeth? We asked Dr. ArNelle Wright - a real life dentist! - to help us break down the science of these tiny metal wonders.

Bracing for a tough question? Send it to us at BrainsOn.org/contact, and we’ll help uncover the tooth.

The Milky Way! Neptune! Uranus! Halley’s Comet! There are so many cool features in our solar system – but how did they get their names? We asked space scientist and communicator Maggie Aderin-Pocock to help us find the answer.

Got a question that’s out of this world? Send it to us at BrainsOn.org/contact, and we’ll make space for an answer.

Waiting for a stoplight to turn green can be really annoying, especially when you’re running late. It would be awesome if you had a magic wand you could wave to get the light to change. But alas, such things don’t exist. But how do stoplights know when to switch colors? We asked Jerry Kotzenmacher with the Minnesota Department of Transportation to help us find the answer.

Got a nagging question that just won’t yield? Send it to us at BrainsOn.org/contact, and we’ll put you in the express lane to answersville.

Have you ever had a scary or weird dream and wished you could switch your brain-television to another channel? Great news! You can learn to use “lucid dreaming,” a technique that helps you realize when you’re in a dream. Once you know you’re dreaming, you can teach yourself to shape your own storyline. So how does that work? We asked Dr. Ketema Paul, Professor, Integrative Biology And Physiology at the University of California, Los Angeles to help us find the answer.

Got a question that’s keeping you up at night? Send it to us at BrainsOn.org/contact, and we’ll help put it to bed.

There are all different kinds of yogurt: Greek, vanilla bean, blueberry, even sheep’s milk yogurt! But how did people first figure out how to make this yummy food? We asked journalist Allison Conroe to help us find the answer.

Got a question that’s whey cool? Send it to us at BrainsOn.org/contact, and we’ll find a legen-dairy answer.