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Tinkercast

Wow in the World is the #1 science podcast for kids and families, sharing the most amazing stories in science, technology, and new discoveries happening in the world around us. 

Each week, join hosts Mindy Thomas and Guy Raz as they take curious kids and their grown-ups on a cartoon for the ear journey filled with laughter, adventure, and wow-worthy stories. From the tiniest microbes to the farthest reaches of space, every episode of Wow in the World inspires wonder, fuels imagination, and makes science fun for the whole family. 

New episodes of Wow in the World come out every Monday for free! Plus, each week listeners get even more opportunities to say WOW with two other shows: Two Whats?! And A WOW!, a science-based game show, and WeWow, a rewatch, or should we say relisten, behind-the-scenes talk show hosted by our World Organization of Wowzers president, Dennis, featuring YOUR comments, reviews, and messages! 

🎉 Want to keep the Wow going? Grownups can join the World Organization of Wowzers (W.O.W.) at https://bit.ly/46CDndK to receive quarterly mailings, birthday cards, a welcome kit with a t-shirt, autographed photo of Mindy & Guy Raz, access to 1,000+ digital activities and exclusive access to members-only events! Plus, grownups help support our podcast and our mission to create content and experiences that connect laughter to learning, curiosity to innovation and kids to the WOWs in their world!

Learn more at https://bit.ly/3IsPeBR. 

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Wow in the World

In this laugh-inducing, hair-raising, and educational episode of Wow in the World, Mindy, Guy Raz, and the WOW crew learn about a new way to help strengthen teeth!

Dennis reveals his brand-new haircut - a perfectly round, helmet-shaped hairstyle hardened with hair gel. While the crew struggles to compliment the new ‘do, the conversation quickly spirals into unexpected territory when Thomas Fingerling and Gramma G-Force insist that Dennis made a terrible mistake by throwing away his hair clippings… According to them, everyone knows hair clippings should be placed under your pillow for the mysterious “Hairy Fairy,” who sneaks in through the keyhole to collect them. If the hair is strong, you might get a prize - maybe even a yacht. If it’s weak? Expect a boiled egg.

But amid the bonkerballs chatter, Mindy realizes something: the Hairy Fairy’s strange obsession with hair might actually connect to real science. She shares an incredible new study from scientists at King’s College London showing that keratin - the protein that makes up our hair and nails - could someday help repair damaged tooth enamel. Since enamel is the hardest material in the human body, but can’t grow back once it wears away, researchers have been searching for ways to rebuild or strengthen it. Their discovery? When keratin interacts with minerals in saliva, it can help form a protective crystal coating on teeth! This coating could potentially strengthen enamel and even outperform the plastic resin materials dentists currently use - making teeth far more resistant to cavities. In the future, keratin from hair could be added to toothpaste, mouthwash, or dental treatments to protect smiles everywhere!

With rollerblades, hair helmets, imaginary creatures, and cutting-edge dental research all colliding in one hilarious adventure, this episode proves that even a haircut can lead to jaw-dropping science.

📺 You can watch the WOW of this episode right now on our YouTube channel, WowTube! Find your favorite Tinkercast podcast episodes, experiments with Mindy, original music with Dennis and so much more at youtube.com/@tinkercast.

✨ Don’t miss the chance to explore even further with Wow in the World:

Grownups can visit https://bit.ly/4pU76WO to join the World Organization of Wowzers (WOW) and unlock exclusive activities, birthday cards, quarterly mailings, first dibs at events, and a welcome kit with an autographed photo of Mindy & Guy Raz! Plus, Grownups help support our podcast and our mission to create content and experiences that connect laughter to learning, curiosity to innovation and kids to the WOWs in their world!

🔒 Privacy Links:

See Privacy Policy at https://art19.com/privacy

California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Hair Today, Teeth Tomorrow: Keratin’s Surprising Smile-Repair Superpower!

Dennis and Reggie read Reveiwsies and end up doing some stunts. Plus an encore episode of, “That's Nuts!” Originally aired 3/9/25.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

WeWow on the Weekend

Dennis has a bad hair day and invents a new segments to fix it. Plus an encore episode of, “An Intergalactic Interloper!” Originally aired 3/8/25.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

The next episode of Two Whats?! And a Wow will either make you squeak or say “Eeeek!”-- depending upon how you feel about… Rodents! Guy & Mindy will give you the 411 on rats, mice and some other amazing critters. Originally aired 1/26/24.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Two Whats?! And A Wow! - Rat's All, Folks!

What happens when biodegradable plastic bags meet the tiny, powerful creatures living in our oceans? In this episode about environmental ocean science, Mindy and Guy take you on a wild ride to explore a scientific breakthrough in biodegradable plastic bags! Listen and and discover how microscopic ocean microbes devour this new plastic, turning it into harmless byproducts. From supermarket chaos to microscopic environmental ocean science, this adventure is full of funny funny hijinx, big adventure, and a breakthrough in biodegradable plastic technology. By connecting laughter to learning, this environmental ocean science episode shows how science and fun can sometimes collide in the most unexpected ways.

It all starts in a bustling eco-conscious supermarket, where Mindy’s stash of plastic bags sparks total chaos, teaching listeners why choosing biodegradable plastic bags over single-use plastics can make a big difference for the environment. Then, back at Mindy’s gingerbread mansion, the real fun begins. She drops the bags into a giant seawater tank and, with the help of the incredible Wow Machine, shrinks down to microscopic size to witness ocean microbes at work. These tiny, hungry organisms munch, digest, and transform the plastic, turning it into safe byproducts—all while Mindy and Guy provide hilarious commentary and clear explanations of the science.

Along the way, you’ll learn that these biodegradable plastic bags can lose 80% of their mass in just over a year, compared to normal plastics that take hundreds of years to disappear. You’ll also explore the role of microbes in ocean ecosystems, see why the Great Pacific Garbage Patch is a massive environmental challenge, and discover how smart, eco-friendly inventions like biodegradable plastic bags could help protect marine life. These ocean experiments for kids highlight the invisible teamwork happening in nature and make it easy to understand how science solves real-world problems—while keeping the fun high and the laughs constant.

Get ready for a whirlwind adventure full of chaos, clever science, and lots of laughter. From flying tomatoes in a supermarket to shrinking down inside a giant seawater tank, Mindy and Guy show how biodegradable plastic bags work in action, why microbes are nature’s unsung heroes, and how small changes in our daily lives can have a big impact on the environment. This is the Who, What, When, Where, Why, How, and Wow in the World of biodegradable plastics and ocean microbes, brought to life with humor, curiosity, and a whole lot of WOW!

📺 You can watch the WOW of this episode right now on our YouTube channel, WowTube! Find your favorite Tinkercast podcast episodes, experiments with Mindy, original music with Dennis and so much more at youtube.com/@tinkercast.

✨ Don’t miss the chance to explore even further with Wow in the World:

Grownups can visit https://bit.ly/4pU76WO to join the World Organization of Wowzers (WOW) and unlock exclusive activities, birthday cards, quarterly mailings, first dibs at events, and a welcome kit with an autographed photo of Mindy & Guy Raz! Plus, Grownups help support our podcast and our mission to create content and experiences that connect laughter to learning, curiosity to innovation and kids to the WOWs in their world!

🔒 Privacy Links:

See Privacy Policy at https://art19.com/privacy

California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info

This episode of Wow in the World is a perfect blend of storytelling and science, inviting kids and families to dive into the mysteries of biodegradable plastic while laughing, learning, and wowing together.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

A Fantastic Plastic Feast: What Happens When Biodegradable Bags Meet Microbes

Reggie loses track of time and Dennis starts the show without him. Then they read reviewsies. Plus an encore episode of, “Hey Onion! You’re Making Me Cry!” Originally aired 3/2/25.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Dennis gets a goldfish and he and Reggie struggle to name it. Then they answer voicemails. Plus an encore episode of, “BANG! Where'd the Universe Come From?!” Originally aired 3/1/25.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

We've got the questions AND answers in this out of this world round of Two Whats?! And a Wow! We're challenging you to find the facts from the fiction about FIRE! Visit https://bit.ly/3zfwJMc for more. Originally aired 10/18/24.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Two Whats?! And A Wow! - We Didn’t Start the Fire!

On the first Wednesday of every month, our pal Dennis holds an official meeting exclusively for members of the World Organization of Wowzers! (... but really anyone can listen...) W.O.W. Members, visit tinkercast.com/wow to find this month’s birthday celebrations, top secret missions, and more!

Grownups, we’re proud to bring free, high-quality educational podcasts to families and classrooms everywhere. But as the media industry changes, it’s becoming increasingly difficult to financially sustain high-quality human-made audio shows like ours without additional help. If our shows have sparked wonder, laughter, or curiosity for your family, we’re asking for your support now.

Grownups, you can give what you can, or visit tinkercast.com/support where you can select from a handful of gifts we’ve curated to thank you for your support.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

World Organization of Wowzers Meeting of Members - March 2026

Aha moments don’t happen by trying harder — they happen when your brain has space to wander!

Join Guy, Mindy, and the gang as they explore the brain science of Aha moments, creative problem solving, and why daydreaming boosts both creativity and problem solving.

After Guy spends two hours searching for glasses that are on his head, Mindy shares research connected to scientists at the University of Tokyo showing that mind wandering helps the brain form new connections and spark insight.

To test the science, Mindy, Guy, and the gang tackle a classic river-crossing brain teaser in the wilderness — where nobody can be left alone without chaos erupting.

In this STEM podcast episode, you’ll discover:

• What happens in the brain during an Aha! moment

 • Why overthinking blocks creative problem solving

 • How mind wandering strengthens flexible thinking

If you struggle with puzzles, creative blocks, or problem solving, this episode is packed with science-backed tools to build a growth mindset and unlock better ideas!

Sometimes the smartest move isn’t focusing harder.

It’s letting your brain wander.

It’s the Who, When, Wow, How, and WOW of AHA! moments and the brain!

📺 You can watch the WOW of this episode right now on our YouTube channel, WowTube! Find your favorite Tinkercast podcast episodes, experiments with Mindy, original music with Dennis and so much more at youtube.com/@tinkercast.

✨ Don’t miss the chance to explore even further with Wow in the World:

Grownups can visit https://bit.ly/4pU76WO to join the World Organization of Wowzers (WOW) and unlock exclusive activities, birthday cards, quarterly mailings, first dibs at events, and a welcome kit with an autographed photo of Mindy & Guy Raz! Plus, Grownups help support our podcast and our mission to create content and experiences that connect laughter to learning, curiosity to innovation and kids to the WOWs in their world!

🔒 Privacy Links:

See Privacy Policy at https://art19.com/privacy

California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

AHA! Moments Explained! How Daydreaming Boosts Creativity and Problem Solving

Why is the show's crew missing? And what does that have to do with dogs?! We've got the questions AND answers in this pup-roarious round of Two Whats?! And a Wow! We're challenging you to find the facts from the fiction about DOGS! Visit https://bit.ly/3owDW5a for more.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Two Whats?! And A Wow! - Top Dog (8/4/23)

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