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Neutron Stars
In the aftermath of a 8 – 20 solar mass star’s demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin rapidly, and have very strong magnetic fields. Some of them we see as pulsars,...
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Social Thinking: Crash Course Psychology
Why do people do bad things? Is it because of the situation or who they are at their core? In this week's episode of Crash Course Psychology, Hank works to shed a little light on the ideas of Situation vs. Personality. Oh, and we'll have...
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Crash Course Film History Preview
Beginning April 13th, join Craig Benzine (the internet's WheezyWaiter) for 16 weeks of Film History right here on Crash Course. He'll look at the history of one of our most powerful mediums. Film has the ability to communicate with...
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Roman Engineering: Crash Course History of Science
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...
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Playstation and More Immersive Video Games: Crash Course Games
So by the mid-90s the video game industry was once again booming and this attracted the attention of the Japanese electronics giant Sony. In 1994, Sony introduced their Playstation console which successfully coupled cutting edge...
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Biological Polymers: Crash Course Organic Chemistry
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...
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Symbolic AI
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...
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The Rise of Melodrama: Crash Course Theater #28
At the turn of the 18th century, audience were ready to go over the top, and get some really, really dramatic theater in their lives. Like, a dog dueling a man type of dramatic. In London, only two theaters were licensed, but...
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Representing Numbers and Letters with Binary: Crash Course Computer Science
Today, we’re going to take a look at how computers use a stream of 1s and 0s to represent all of our data - from our text messages and photos to music and webpages. We’re going to focus on how these binary values are used to represent...
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Reconstruction and 1876 Crash Course US History
In which John Green teaches you about Reconstruction. After the divisive, destructive Civil War, Abraham Lincoln had a plan to reconcile the country and make it whole again. Then he got shot, Andrew Johnson took over, and the...
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Neural Networks - Crash Course Statistics
Today we're going to talk big picture about what Neural Networks are and how they work. Neural Networks, which are computer models that act like neurons in the human brain, are really popular right now - they're being used in everything...
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The War of 1812 - Crash Course US History
In which John Green teaches you about the War of 1812. The War of 1812 was fought between the United States and its former colonial overlord England. It started in, you guessed it 1812. The war lasted until 1815, and it resolved very...
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Breaking the Silence: Crash Course Film History
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...
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In the Mood For Love: Crash Course Film Criticism
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...
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Deviance: Crash Course Sociology
What is social deviance? Who defines what is deviant and how to people come to behave that way? Today we’re going to explore biological and psychological approaches to explaining deviance, including what each perspective can bring to the...
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Economics of Education: Crash Course Economics
How does education work? Where does the money come from? Who pays for it? Is going to college a good investment? Adriene and Jacob are talking today about the economics of education. Most countries require that their citizens get some...
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The 17th Century Crisis: Crash Course European History
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,...
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Intro to Substitution Reactions - Crash Course Organic Chemistry
Substitution reactions can have really powerful effects, both good and bad, in our bodies. You might remember substitution reactions as displacement reactions from general chemistry, but (you guessed it!) in organic chemistry they’re a...
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The Replication Crisis - Crash Course Statistics
Replication (re-running studies to confirm results) and reproducibility (the ability to repeat an analyses on data) have come under fire over the past few years. The foundation of science itself is built upon statistical analysis and yet...
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Training Neural Networks
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...
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The Future of Gaming: Crash Course Games
Welcome to the FINAL LEVEL of Crash Course Games! We thought it made the most sense to sign off this series by taking a look towards the future because you know... boss battles are supposed to be tough. Now we don't know the future...
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Straight Outta Stratford-Upon-Avon - Shakespeare's Early Days: Crash Course Theater #14
This is the story of how a young Englishman named William Shakespeare stormed London's theater scene in the late 16th century, and wrote a bunch of plays and poems that have had pretty good staying power. We'll learn about Shakespeare's...
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Operating Systems: Crash Course Computer Science
So as you may have noticed from last episode, computers keep getting faster and faster, and by the start of the 1950s they had gotten so fast that it often took longer to manually load programs via punch cards than to actually run them!...
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Artificial Intelligence & Personhood: Crash Course Philosophy
Today Hank explores artificial intelligence, including weak AI and strong AI, and the various ways that thinkers have tried to define strong AI including the Turing Test, and John Searle’s response to the Turing Test, the Chinese Room....