Fish-eating trees sound like they’re straight out of science fiction. But they’re a real thing—one that exists right here on Earth. And they show just how interconnected life on this planet is.

Metabolism is a complex process that has a lot more going on than personal trainers and commercials might have you believe. Today we are exploring some of its key parts, including vital nutrients -- such as water, vitamins,...

Soil brings together all four spheres of physical geography, and understanding soil composition is kind of like baking! So in today's episode, we're going to show you how to create the perfect soil cake, examine its different soil...

Paul Andersen surveys the circulatory system in humans. He begins with a short discussion of open and closed circulatory systems and 2,3, and 4-chambered hearts. He describes the movement of blood through the human heart and the blood...

Thanks to my grandmother for inspiring this story, and to my mother for helping make it.



Bird poop was the gateway fertilizer that turned humanity onto the...

Our friend Elliot thought we should do an episode about composting... so we did! Learn all about how you can turn certain types of trash into nutrient packed soil you can use in the garden!

Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of living and nonliving things interacting in...

In this video Paul Andersen describes the four major spheres on planet Earth. The geosphere makes up the mass of the planet and includes the major landforms. The hydrosphere is all of the water and the atmosphere is all of the gases. ...

Hank reports on some new discoveries: one which points towards the existence of dark matter with the "majorana particle" and another, which points towards the existence of life on Mars. Exciting stuff!

If you lined up all the blood vessels in your body, they'd be 60 thousand miles long. And every day, they carry the equivalent of over two thousand gallons of blood to the body's tissues. What effect does this pressure have on the walls...

Animals eat their own poop in order to gain extra access to nutrients or to microbes that help digest those nutrients.



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Each day, the animal kingdom produces roughly enough poop to match the volume of water pouring over Victoria Falls. So why isn't the planet covered in the stuff? You can thank the humble dung beetle for eating up the excess. Eleanor...

Hank noticed something mysterious in the park one day. Fairy rings: are they mystical portals to another realm? Or could there be another, more scientific, explanation?

Plants have their own interconnected networks that allow them to communicate with each other, sometimes over considerable distances!

In 2010, 30 billion dollars worth of fruits and vegetables were wasted by American retailers and shoppers, in part because of cosmetic problems and perceived spoilage. But what are these spots, anyway, and are they okay to eat? Elizabeth...

We've talked about food chains and how energy moves through an ecosystem, but let's take a step back and see how everything starts... and ends. Decomposers! This first series is based on 5th grade science. We're super excited and hope...

420 million years ago, a giant feasted on the dead, growing slowly into the largest living thing on land. It belonged to an unlikely group of pioneers that ultimately made life on land possible -- the fungi.

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.

Hank talks about the last major way humans are impacting the environment in this penultimate episode of Crash Course Ecology. Pollution takes many forms - from the simplest piece of litter to the more complex endocrine distruptors - and...

Squeaks has a Valentine's surprise for Jessi: a bouquet of flowers! Flowers are beautiful and they smell great, but did you know that flowers also do a very important job?

This video is answering the question of how does soil erosion affects soil.

James, our master of microscopes, seems like a tough person to get a gift for. What do you get the person who has the entirety of the microcosmos available to him with just a glimpse through a lens?<br/>

What do plants need to grow? Most of us would answer that they need light, air, water, and soil. But by using a process called hydroponics, you can grow plants without soil! How does it work? Try this project and see for yourself!

How cells find balance.