Population ecology is the study of groups within a species that interact mostly with each other, and it examines how they live together in one geographic area to understand why these populations are different in one time and place than...

In which John Green examines the French Revolution, and gets into how and why it differed from the American Revolution. Was it the serial authoritarian regimes? The guillotine? The Reign of Terror? All of this and more contributed to the...

The next entry in our parade of heroes is Rama, the protagonist of the Ramayana, one of India's oldest stories. We're going to be talking about Rama's importance to Hindu culture, and how Rama fits into Campbell's idea of the Hero's...

Last time we learned about the Enlightenment, and the philosophers and thinkers whose ideas would shape governance for hundred of years. This week, we're learning how monarchs across Europe were influenced by those ideas. Adoption of...

In which John Green wraps up revolutions month with what is arguably the most revolutionary of modern revolutions, the Industrial Revolution. While very few leaders were beheaded in the course of this one, it changed the lives of more...

In which Jacob and Adriene teach you about the evils of fiscal policy and stimulus. Well, maybe the policies aren't evil, but there is an evil lair involved. In this episode we learn how government use taxes and spending influence the...

Remember Sol, the closest star to Earth? We like to call it The Sun and we haven't talked about it in a little while. One interesting thing about the energy we get from the sun is that it's not absorbed the same way by different...

So, what's the difference between 'weather' and 'severe weather'? Is it just how hard the wind is blowing? Is it just thunder and lighting? Well, it can be some or all of those things. In this episode of Crash Course Kids, Sabrina talks...

So, we've been putting off a kind of basic question here. What is money? What is currency? How are the two different. Well, not to give away too much, but money has a few basic functions. It acts as a store of value, a medium of...

The thing about European History is that it tends to leak out of Europe. Europeans haven't been great at staying put in Europe. As human beings do, the people of Europe were very busy traveling around to trade, to spread religion, and in...

Today we’re going to talk about the link between population and food energy. As the world's population keeps growing, finding ways to provide enough food and water for everyone while supporting a sustainable environment can be tricky! ...

Is the world overpopulated or underpopulated? While we worry about there being too many people for the planet to support, we can also worry about how fewer people in a given place may affect the economy, what may happen when there are...

This week, we're continuing our discussion of heroes by talking about Gilgamesh, star of one of the earliest written hero stories, The Epic of Gilgamesh. Gilgamesh was a terrible ancient king who left his kingdom seeking adventure, and...

Join Phil for a tour of our capital-M Moon, from surface features, inside to the core, and back in time to theories about its formation.

John Green teaches you about the so-called Dark Ages, which it turns out weren't as uniformly dark as you may have been led to believe. While Europe was indeed having some issues, many other parts of the world were thriving and...

Remember that guy from 300? What was his name? ARG!!! It turns out our brains make and recall memories in different ways. In this episode of Crash Course Psychology, Hank talks about the way we do it, what damaging that process...

In which John Green teaches you about globalization, a subject so epic, so, um, global, it requires two videos. In this video, John follows the surprisingly complex path of t-shirt as it criss-crosses the world before coming to rest on...

Human reproduction is complicated an important, and it's going to take a four part series for us to cover it. Today, we're kicking that off with the female reproductive system, starting with how sex hormones affect oogenesis and...

We've talked about constellations; groups of stars in the night sky that we assign names to. But there are a certain group of special constellations called The Zodiac that Sabrina is going to chat about. Gemini, Sagittarius, Scorpio?...

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,...

Hank teaches us why water is one of the most fascinating and important substances in the universe.

In our final episode of Crash Course Geography we're going to take a look towards the future, and to do that we'll need to revisit our fundamental geography tools: space, place, and human-environment interactions! We'll talk about the...

Chemistry raised to the power of AWESOME! That's what Hank is talking about today with Electrochemistry. Contained within, Hank discusses electrochemical reactions, half reactions, how batteries work, galvanic cells,...

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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