In which John Green teaches you about population. So, how many people can reasonably live on the Earth? Thomas Malthus got it totally wrong in the 19th century, but for some reason, he keeps coming up when we talk about population. In...

So... do plants need dirt? The truth might shock you. In this episode of Crash Course kids, Sabrina talks about how plants get energy and how that energy is transported around them. Also, she talks about dirt.

Want a Pineapple? If you want a pineapple, it's possible you can just run down to the store and get one. But, if you wanted to grow one, that's a lot more difficult depending on where you live. In this episode of Crash Course Kids,...

The famous Irish Potato Famine was thanks to farming practices and p. infestans (among other things). But are the Colorado Potato Beetle and the climate crisis teaming up to bring about the next potato famine? Here's what research suggests.

The Park Grass experiment at Rothamsted Research Centre in England is the world's longest-running ecological experiment. It's also the result of a sort of Victorian Stardew Valley, the enduring friendship between John Bennet Lawes and...

If you were really into gift shops as a kid, you probably loved to look at all the shiny geodes. But those little geodes are nothing compared to the mother of all geodes, found is in Put In Bay, Ohio. So let's talk about how this...

Why do we have wisdom teeth? They're just going to come in wrong and cause problems. Wisdom teeth are a souvenir from our early human ancestors, and we actually understand less about them than you might think.



Hosted by: Reid...

Plants may not seem like they’re doing much, but if you look closer, you’ll find a whole world just lurking beyond the surface. We’re talking chemical defenses, highways, and even ways to change the weather. In this episode, we’ll learn...

What’s the life of a cell like? In this episode of Crash Course Biology, we’ll follow a cell’s life cycle, from its beginning as a shiny new cell all the way to division via mitosis. We’ll learn how our cells control this process, and...

Confidence doesn’t come before action — it comes from taking action, says business leader Kat Cole, who worked her way up from waitress to CEO of a global health company. She presents a simple yet powerful practice called the "hot shot...

Leadership isn’t about a title or position — it’s about generosity, says organizational expert Joe Davis. Drawing on his extensive experience as a people manager, he shares three essential tips for leaders to unlock the potential of...

To launch new initiatives within the confines of a large corporation, you'll need to work with the system, not against it, says "intrapreneur" Dave Raggio. He shares three lessons on innovation he learned the hard way — so you don't have...

What we eat is less about what we choose and more about what’s offered to us, says food and climate expert Sarah Lake. Unpacking how governments and companies have driven up meat consumption in the US through extensive marketing, she...

An amazing new technology will let scientists grow new kidneys for patients using their own stem cells inside of pigs.

Poop Transplants!

Global food production - from meat to grains - accounts for a third of all greenhouse gas emissions, says sustainability scientist Jonathan Foley. He presents a portfolio of data-backed solutions to build a better food system world-wide,...

Can strawberries grown inside a building taste sweeter than those grown in a field? Farming entrepreneur Hiroki Koga explores how his team is combining solar-powered vertical farms with AI, robotics and indoor bee colonies to grow...

The oceans around Antarctica are cold, but full of life. Join Jessi and Squeaks to learn about the blubber of seals, the amazing antifreeze blood of fish, and the shrinking skills of krill.

Antarctica is the coldest place on Earth, but there's still a lot to explore, on land and under the waves!

In this episode, Jessi and Squeaks learn what it takes to be a "true bug". Scientists use the word "bug" to refer to a special group of insects, so not all insects (or other critters like spiders) are bugs!<br/>

The way we raise animals is destructive to humans, animals and the environment, says cardiologist and entrepreneur Uma Valeti. He presents a solution that doesn't require you to give up your favorite protein-packed meals: cultivated...

One in three workers globally will see their jobs disrupted by AI and tech advancements this decade — but there's a way to stay ahead of the curve. Skill-building strategist Sagar Goel shares practical examples from a partnership with...

Breast cancer is a shockingly common disease - as many as 13% of females may get it at some point in their lives. And there's a lot of confusing info out there about it, from hormones to BRCA genes to risks and treatments. So we're here...

You’ve heard of Tyrannosaurus rex, but did you know they might have a mini-cousin called Nanotyrannus? And that “might” is serious, because researchers have been arguing about it for nearly 40 years and still haven’t gotten to the bottom...