The Romans developed a lot of infrastructure like roads and aqueducts to both help their cities flourish and to... you know... be better at war. But the interesting thing about Roman Engineering is how it was almost all focused on Techne...

You might think a self regulating factory sounds pretty unbelievable, but that’s pretty much exactly how our bodies work! Our bodies are full of regulatory mechanisms that keep all the organic molecules we need to live in balance. In...

Today we're going to talk about Symbolic AI - also known as "good old-fashioned AI". Symbolic AI is really different from the modern neural networks we've discussed so far, instead, it represents problems using symbols and then uses...

Nothing changed movies like the arrival of synchronous sound. NOTHING! Acting, directing, cinematography, and presentation all had to be rethought. Some studios were more quick to take on the challenge while others waited until the last...

Cinematic love stories come in all shapes and sizes. Movies are really good at both capturing and projecting emotions. And one of the best directors at the modern love story is Wong Kar-Wai. In this episode of Crash Course Film...

The 17th Century in Europe was pretty rough in a lot of ways. The Thirty Years War involved a lot of countries, and a lot of battles, and it was terrible for everyone involved, as wars have aa historical tendency to be. At the same time,...

Today we’re going to talk about how neurons in a neural network learn by getting their math adjusted, called backpropagation, and how we can optimize networks by finding the best combinations of weights to minimize error. Then we’ll send...

In the late 1970s and throughout the 1980s, protests and unrest continued continued across Europe, and the Soviet Union was having increasing trouble holding its sphere of influence together. Today you'll learn about the labor strikes of...

This is it! The final episode of CC Literature season 4 is a deeper look at Jane Austen's Pride and Prejudice. Today we'll explore the novel's take on materialism, and we'll talk about whether the novel has a liberal or conservative...

In which John Green teaches you the history of the Indian Ocean Trade. John weaves a tale of swashbuckling adventure, replete with trade in books, ivory, and timber. Along the way, John manages to cover advances in seafaring technology,...

Finally, after what seems like eons and eons, the end is nigh. We're talking not only about the end of Crash Course Big History, but also the end of everything. The end of humanity and the end of the universe.John and Hank Green will...

It's a new series in Crash Course Film as Michael Aranda takes the reins as host for the next 15 weeks to talk about Film Criticism.

Today we continue our tour through the major fields of engineering with a look at mechanical engineering, beginning with the steam engine. We’ll discuss aircraft, the development of aerospace engineering, and take a look into the future...

Between 1840 and 1914, an estimated 40 million people left Europe. This is one of the most significant migrations in human history. So, who was leaving Europe? And why? Crash Course is on Patreon! You can support us directly by signing...

Movies are really good at making us feel. Happy, sad, excited, etc... Part of that is because they use so many different types of media all at once. Photography, music, performance, and editing all play into their ability to communicate...

Today, in our series finale, we're going to talk about the great white whale of navigating online information: your social media feed. Social media shapes both our online and offline behaviors from how we engage in communities and...

During the 2017 Project For Awesome livestream, I promised I'd make a tuatara video if we hit our fundraising goal, and I'm a man of my word! Little did I know I'd get to meet a tuatara and learn things about a 200 million year old...

In which John Green continues to explore F. Scott Fitzgerald's novel, The Great Gatsby. In this installment, John looks into the titular Gatsby's purported Greatness. Gatsby's single-minded pursuit of Daisy, his checkered past, and his...

In which John Green teaches you about the Holy Roman Empire by teaching you about Charles V. Charles Hapsburg was the holy Roman Emperor, but he was also the King of Spain. And the King of Germany. And the King of Italy and the Lord of...

When you think about the technology that helps us prevent outbreaks, what do you think of? Vaccines? Lab tests? Medications? What about toilets? That's right! Toilets are an important piece of technology that can help us prevent...

In which John asks whether globalization is a net positive for humanity. While the new global economy has created a lot of wealth, and lifted a lot of people out of poverty, it also has some effects that aren't so hot. Wealth disparity,...

John Green teaches you about Voltaire's hugely important Enlightenment novel, Candide. Candide tells a pretty wild story, but for the most part, it's about the best of all possible worlds. Which, spoiler alert, doesn't seem to be the...

In which John Green teaches about filthy, filthy lucre. Money. And Debt. So, what is money? And what is it for? And why do we use money? And why does it all disappear so quickly after payday? John will look into 75% of these questions,...

Beasts of No Nation is available to stream on Netflix (as it is a Netflix release). Some films are about war, some films are about kids, but some films are about kids during a time of war. Even more upsetting are films about kids who...