There are fossils of viruses, of sorts, preserved in the DNA of the hosts that they've infected. Including you. This molecular fossil trail can help us understand where viruses came from, how they evolved and it can even help us tackle...

Paul Andersen describes the important characteristics of viruses. He starts with a brief description of origin theories. He then describes the two characteristics of all viruses; genetic information and protein coats. He also...

When you picture the lowest levels of the food chain, you might imagine herbivores happily munching on lush, living green plants. But this idyllic image leaves out a huge (and slightly less appetizing) source of nourishment: dead stuff....

With sandwiches and toast, sourdough bread always adds an extra accented flavor to your meals. But where does the signature tartness come from?

Soil doesn't seem like it's "alive", yet it functions like a living thing in lots of key ways.

Viruses all around us, they evolve, grow, and can be killed. But are they alive?

We have a lot of water on Earth, but we also can't actually drink much of it... or use it for farming. That's because most of the water on Earth is saltwater. We humans, like a lot of living things, need freshwater to survive. In this...

Why do we often wait so long to recognize each other's gifts? Why are the truest compliments for the people we love often said only after they're no longer around to hear and savor them? Andrea Driessen makes the case for writing...

Humans make a lot of garbage every day, and a lot of it ends up in big, smelly dumps. Luckily, there are things we can do to reuse a lot of our garbage and keep the Earth healthy and clean! Join Jessi and find out how!

If you traced your family tree back far enough, you'd see that you're related to all 7 billion people on Earth! And if you trace it back even farther than that you'll find our ancient human cousins, the Neanderthals!

In this episode of Crash Course Anatomy & Physiology, Hank gives you a brief history of histology and introduces you to the different types and functions of your body's tissues.
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Jessi and Squeaks make a new friend named Grady, and he teaches them about all the living things you can find in soil!



Disciplinary
Core Idea:
LS4.D: Biodiversity and Humans - There are many different kinds of living...

The classical physics that we encounter in our everyday, macroscopic world is very different from the quantum physics that governs systems on a much smaller scale (like atoms). One great example of quantum physics' weirdness can be shown...

In this episode of Crash Course, Hank introduces you to the complex history and terminology of Anatomy & Physiology. -- Table of Contents: Anatomy: The Structure of Parts 2:34 Physiology: How Parts Function 3:50 Complementarity of...

using examples from birdsong, the natural lilt of emphatic language and even a cooking pan lid, singer-songwriter and TED Fellow Meklit Hadero shows how the everyday soundscape, even silence, makes music. "The world is alive with musical...

Everyone eats, right? But how does that food get the energy to power you? In this episode of Crash Course Kids, Sabrina talks about the way energy moves, or flows, through an ecosystem and how that movement forms Food Chains! This first...

You're alive! And so are all the plants in your garden, the birds in the sky, and the fish in the ocean! But how do we know they're alive? What does it even mean to be alive in the first place!? Join Jessi and Squeaks to learn how...

Paul Andersen takes you on a tour of the cell. He starts by explaining the difference between prokaryotic and eukaryotic cells. He also explains why cells are small but not infinitely small. He also explains how the organelles work...

Why I Play Poetry – Chiltern Primary

Vincent van Gogh was a Dutch painter whose bold colors and emotional brushstrokes made him one of the most famous artists in history. Though he struggled with poverty and mental illness during his life, he created over 2,000...

In the 1990s, an entire city in the Caribbean vanished under ash. Plymouth, Montserrat, once vibrant, now lies frozen in time—buried by a volcano still simmering beneath the surface. We explore how this community has endured, and how...

Marley’s Mutts Dog Rescue is a 20 acre ranch full of love, hope and possibility of a new life.

Howcast - Check out this Portal 2 walkthrough and beat Chapter 1 - Part 3: Room 02/19 with this online demo.

Howcast - Learn what tunes make good krumping songs in this Howcast dance video with choreographer Jamal Cumberbatch.