Have you ever wondered if there is anyone (or anything) else out there in the universe? Well, you're not alone. But what would alien life look like? And what would their food chains and food webs look like? In this episode of Crash...

The earliest recorded tattoo was found on a Peruvian mummy in 6,000 BC. That's some old ink! And considering humans lose roughly 40,000 skin cells per hour, how do these markings last? Claudia Aguirre details the different methods,...

Hank reaches the fourth and final of the four fundamental interactions in physics: electromagnetism. In this part, he teaches us about the electrostatic force, which builds up a charge in an object and can travel in the form of an...

Hank wraps up the Crash Course on ecology by taking a look at the growing fields of conservation biology and restoration ecology, which use all the kung fu moves we've learned about in the past eleven weeks and apply them to protecting...

These days, it seems like we're finding water all over the solar system. Still, it takes a lot more than a little H2O to support life.

Moving on to our unit on the Physics of Electricity, it's time to talk about charge. What is charge? Is there a positive and negative charge? What do those things mean? In this episode, Shini talks about electrostatic forces, electrical...

You're being watched. That sounded more sinister than I intended, but online, it's true. Facebook, Instagram, Amazon, Netflix... the list goes on and on. They're watching what you do, what you shop for, what you watch... all of it. And...

In 1910, 90% of Black Americans lived in the South. By 1940, around 1.5 million Black Americans had left their homes, and 77% lived in the South. By 1970, 52% of Black Americans remained in the South. People moved away for many reasons,...

Hank briefs us on the news of earthquakes in Indonesia and helps us understand why these had less impact than earthquakes which hit the area in 2004.

Life in a desert can be tough, but the plants, animals, and people that live there have some special skills to help them survive!

Some lucky animals are naturally endowed with bioluminescence, or the ability to create light. The firefly, the anglerfish, and a few more surprising creatures use this ability in many ways, including survival, hunting, and mating....

By the end of the 19th century, nearly 40% of American cars were electric. But these vehicles had a few major problems — early car batteries were expensive and inefficient, and the vehicles were twice the price of a gas-powered car. And...

In which John Green teaches you about the changes wrought by contact between the Old World and the New. John does this by exploring the totally awesome history book "The Columbian Exchange" by Alfred Cosby, Jr. After Columbus...

Frogs are really cool! They can jump high, swim fast, and their skin is super slimy! But frogs have some less-slimy, less-hoppy relatives that are just as cool: toads! Join Jessi and squeaks to learn the big and little differences...

Today we're going to tell the story of a quiet revolution in the 1960s that shifted our entire understanding of how the Earth works. We currently believe that the Earth's broken outer shell rises from the mantle and folds back in - kind...

So we've been talking about civil rights for the last few episodes now, and we're finally going to wrap this discussion up with the rather controversial topic of affirmative action. We'll explain what exactly affirmative action is, who...

How does heat affect airplanes? Turns out heat, speed and density connect to create dangerous situations.

Squeaks and Mister Brown do some experiments with soil, and learn all about why different soils feel different!



Disciplinary C

ore Ideas:

PS1.A: Structure and Properties of Matter - Matter can be described...

Have you ever moved? Some animals move too! And if an animal moves from one place to another for weather or food, it's called migration!

All life on Earth— living and inanimate, microscopic and cosmic— is governed by mathematical laws with apparently arbitrary constants. And this opens up a question: If the universe is completely governed by these laws, couldn't a...

From launching probes to ferrying experiment racks to the ISS, the Space Shuttle Atlantis has left quite the legacy on space exploration and scientific research.

As the Roman Empire fell, so did the theater. If there's anyone who hates theater and actors more than Romans, it's early Christians. As Christianity ascended in the west, theater declined. But, fear not. This isn't the end of the...

This week on Crash Course Theater, Mike is acting like theater started in Greece. Well, for the western theater, this is true. The earliest recorded drama in the west arose in Athen, and these early plays grew out or religious ritual....

Theater had a slow start in Germany, mainly because Germany wasn't really a thing until *relatively* recent times. After Germany finally became a unified state, it had a couple of really important theatrical movements. Today we'll talk...