Ecosystems and habitats

In this episode, we’re asking sharks to say “aaaah”, and taking a close look at their chompers. We’ll see how shark teeth grow, and what those teeth can teach us about sharks of the past. We’ll also play a game of Jaws Jeopardy, and find out how sharks help keep the ocean healthy with their super snacking. Stick around for a listener-submitted mystery sound and a Moment of Um: why does steam rise in the air?

We’re heading to a squirrel-themed adventure course and practicing a few of the skills they use to survive: gathering nuts, traveling in trees, and speaking like a squirrel.

Eighteen months into our fight with this coronavirus, it may feel frustrating that we're still in this battle, but there are many reasons to feel hopeful. One reason is that we know a lot about this virus now and have plenty of tools to fight it. We meet the superheroes prepared to help us defeat the coronavirus: Sgt. Socially Distanced, the Masked Mentor, the Testmaster and the Vaxinator! Plus: Gilly, one half of the hit podcast Going Viral with Kara and Gilly, and a special guest explain what a virus variant is and how the delta variant is different from the original coronavirus. Also, journalist Sarah Zhang helps us understand how the pandemic could end.

After getting a firsthand look at the history of trash, we’re having visions from garbage’s present and future this week. Producer Kunsang Dorjee visits a landfill to see what happens to our trash after we throw it away, and producer Ruby Guthrie shows us how we can make less trash and dispose the trash we do make in ways that are better for the planet. Plus: we hear from a kid who helped her class produce almost no waste during the school year. And our Moment of Um answers the question: if ants like sweet things, why don’t they attack beehives?

A pair of ghost shoes visit Molly with a message: it's time to think about garbage. They predict that Molly will be visited by three visions of garbage, one from the past, one from the present and one from the future.

The flu shot changes every year. But why is the flu special, if other illnesses have much longer-lasting vaccines? This episode takes us into the world of viruses and immunity?

Pollination takes center stage in the second of our two-part bee episodes.

We’re going inside the beehive to find out why bees buzz, learn about their stingers and so much more.

Fair warning: Today we’re gonna get gross! We’re talking sounds, smells, and tastes that some people might find repulsive. But we're asking: why? What's the purpose of disgust? Is it something we're born knowing or do we learn to dislike things? When will entomophagy (the eating of insects) catch on everywhere? Plus: A brand new Moment of Um answers the question "Why do worms come out when it rains?"

We know you have a lot of poo questions because you’ve sent many, many of them to us. So we’re finally bringing you the poo answers! It’s a poop party!

A lot of us are angry right now, with good reason. We’re seeing people treated unfairly because of racism -- that’s when people don’t like someone’s race or the color of their skin. In this episode we’ll talk about how anger can be a useful emotion and can be used to push for change. We’ll also revisit parts of our 2019 series on emotions, including an explanation of the hormones behind anger, why some of us are quicker to anger than others and what we can do when we feel overwhelmed by our feelings.

In this episode, we learn all about narwhals (what that tusk is for and how they’re connected to the myth of the unicorn) and the evolution of teeth (from scale-like nubbins to the versatile chompers we have today).

Humans have been predicting weather for a long time - way before modern technology. So how did they do it? We’ll meet the man who invented the word “forecast” and brought weather reports to the newspaper.

Get ready for a howling good time. We’re going to see how wolves evolved into dogs.

What’s lurking in the depths of the ocean? Or your local loch? We’re diving deep into the world of water-dwelling mythical creatures in part three of our series on myths.

Was Atlantis a real city? If not, why have so many people gone looking for it? In part two of our series on modern myths and legends, we’re searching for lost cities.

Where do stories of unicorns, mermaids and Bigfoot come from? And do they have any truth to them? In this four-part series, we're tackling listeners' biggest questions about modern myths and legends. Today's episode is about mythical creatures that live on land.

What was the very first lifeform like? What was the first fish or mammal? Is it even possible to know?