Why do we have to sleep?

<p>The grass is wet, but there’s been no rain, and the skies are clear... What explains the dampness covering everything on a cool morning? It's called dew! </p><p>Meteorologist and ABC weather presenter Nate Byrne joins Nij and the kids to explain what exactly dew is, and where ... Show More

<p>Nij is out of fridge magnets and discovers they can't be replaced by just any piece of metal. What gives magnets their power to pull and push, and how do they stick to things? Nij and the kids get the answer from physicist Dr Cathy Foley, who explains how magnets work and why ... Show More

<p>Nij has nits! But what are nits, and why do they make us itch? Medical entomologist Cameron Webb and the kids comb through Nij's head for a close-up look.</p> 

<p>We're talking about teeth with a friendly dentist! How do teeth become loose? Why do our baby teeth fall out? Why do people only have two sets of teeth? Why don't babies have teeth when they're born? Why are teeth white? Why do we have gums in our mouth? How does toothpaste cl ... Show More

We asked experts to answer five questions about how to properly care for your teeth. Here's what they said about finding a dentist, whitening your teeth at home, and whether daily flossing is necessary. Learn more about sponsor message choices: podcastchoices.com/adchoices NPR Pr ... Show More

<p>Today we’re looking at a phenomenon that happens to all of us: losing our baby teeth and getting new ones! So how do our teeth grow in and what makes them fall out? Naturally, a group of wandering teeth helps us explain. We'll also find out why we have two sets of teeth in the ... Show More

If you’re scared of the dentist you are not alone and you NEED to hear what this guest has to say. This week we talked with dentist Dr. Marie Jackson to answer questions about oral hygiene. She gives her BEST tips for taking care of your teeth and debunks common oral care myths, ... Show More

Brush twice a day. Remember to floss. Visit the dentist twice a year. We know the drill...or maybe not? In this episode, how to take care of your teeth, from finding a good dentist, to home teeth whitening, to the best brushing techniques. This episode originally published on Feb ... Show More

There are millions of people sitting in dentists’ offices around the world getting their teeth drilled. Crowns, implants, bridges, fillings, root canals, veneers and tooth repairs are a common theme while the causes of teeth problems are still a mystery. In this podcast episode w ... Show More

When a dentist tells us something is wrong with our teeth, we tend to follow their advice. But when Mona visits two different dentists, they give her two wildly different diagnoses (with wildly different price tags). So how do we know who's telling the tooth? Mona digs up the den ... Show More

The toothbrush was invented in jail - by a prisoner! How did that happen? And how did toothbrushing become a regular daily activity in the 1950s? You'll travel to Egypt, London, and more in this episode that will get your kids excited to brush!   For more great Toothbrushing reso ... Show More

<p>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 <em>is</em> a cavity? And how do dentists fix them?<br ... Show More