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CrashCourse

At Crash Course, we believe that high-quality educational videos should be available to everyone for free! Subscribe for weekly videos from our current courses! The Crash Course team has produced more than 60 courses on a wide variety of subjects, ranging from the humanities to sciences and so much more! We also recently teamed up with Arizona State University to bring you more courses on the Study Hall channel.Links:Support us on Patreon!: http://patreon.com/crashcourseInstagram:

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All Episodes

17:02

Nonviolence and Peace Movements: Crash Course World...

CrashCourse ·

2026/09/30

In which John Green teaches you about nonviolence and peace movements in the 20th century. What is nonviolence? What is a peace movement? Well. traditionally, humans often resort to violence when they come into conflict. In the 20th century, it became much more common for people to enact change by means of nonviolence, and there was a common thread of connection between many of the most notable advocates of peaceful change. Crash Course will take you from Gandhi to Gregg to Bayard Rustin to Martin

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14:14

The Black Women's Club Movement: Crash Course Black...

CrashCourse ·

2026/09/30

In the late 19th and early 20th centuries, Black American Women were struggling with both racism and misogyny as they fought for their rights. Black Women formed clubs and organized to make sure civil and political rights were extended to ALL Black people, not just Black men. These clubs were grass-roots organizations of middle-class women who were often only one generation removed from slavery. Today we'll learn about the origins of these clubs and some of the notable women who drove this movement

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13:31

Introduction to the Solar System: Crash Course...

CrashCourse ·

2026/09/29

In today's Crash Course Astronomy, Phil takes a look at the explosive history of our cosmic backyard. We explore how we went from a giant ball of gas to the system of planets and other celestial objects we have today.This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourseCheck out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction 00:00Geocentrism vs Heliocentrism 0:51Makeup of the Solar

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15:30

Where and Why Do People Move? Crash Course Geography #32

CrashCourse ·

2026/09/29

People have been migrating and transplanting since before recorded history, and understanding the reasons why people migrate can help explain some of the cultural, economic, and political patterns we see around the world. Today, we’re going to mostly focus on the Indian diaspora, which is the largest in the world with over 18 million people of Indian descent living outside of India. And through this lens, we’ll teach you about many different types of voluntary and involuntary migration throughout

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14:11

The Nervous System, Part 3 - Synapses!: Crash Course...

CrashCourse ·

2026/09/29

We continue our tour of the nervous system by looking at synapses and the crazy stuff cocaine does to your brain.Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZoDownload it here for Android Devices: https://bit.ly/2SrDulJChapters:Introduction: What are Synapses? 00:00Electrical vs Chemical Synapses 1:58How Electrical Synapses Work: Gap Junctions 2:56How Chemical Synapses

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15:41

Can We Predict An Outbreak's Future? - Modeling:...

CrashCourse ·

2026/09/29

When outbreaks happen, we need to be able to predict the course they’ll take in the future, but of course we can’t run experiments on real people to figure that out. Thankfully we can simulate outbreaks and use models to find out how different scenarios could play out! In this episode of Crash Course Outbreak Science, we’ll look at what models are, how they help predict the course of an outbreak, and how we can use them to manage real world outbreaks.This episode of Crash Course Outbreak Science was

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11:42

Congressional Committees: Crash Course Government and...

CrashCourse ·

2026/09/28

This week Craig Benzine clears up the role of committees in Congress. We’ll talk about standing committees, joint committees, conference committees, and caucuses (and not the candidate-choosing kinds) as well as the staff agencies that help advise these committees and congresspeople. As most bills never even make it to the house and senate floors for a vote, the role of committees, and their respective chairpersons as gatekeepers is pretty important. There’s a lot to demystify here as the

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16:54

The Great Migration: Crash Course Black American...

CrashCourse ·

2026/09/28

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, including increased opportunity in the more industrial North and West. They sought a relatively safer life away from the lynchings and violence that were concentrated in the South. This Great Migration shaped 20th-century America in countless ways, but we're going to

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13:01

Tides: Crash Course Astronomy #8

CrashCourse ·

2026/09/28

Today Phil explores the world of tides! What is the relationship between tides and gravity? How do planets and their moons become tidally locked? What would happen if you were 300km tall? Important questions.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction 00:00Gravity Over Distance 0:44Tidal Force Parameters 1:35Battle of the Bulges 2:55High and Low Tides 3:47Push & Pull 4:51Tidal Lock 6:07Sun Tides

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13:51

How Populations Grow and Change: Crash Course...

CrashCourse ·

2026/09/28

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 more elderly people who need care than there are healthcare workers, or even be concerned about how many people are necessary to carry on other aspects of culture. Today, we'll discuss Malthusian and Boserup predictions on the planet's carrying capacity and take a

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17:47

Japan in the Heian Period and Cultural History: Crash...

CrashCourse ·

2026/09/27

In which John Green teaches you about what westerners call the middle ages and the lives of the aristocracy...in Japan. The Heian period in Japan lasted from 794CE to 1185CE, and it was an interesting time in Japan. Rather than being known for a thriving economy, or particularly interesting politics, the most important things to come out of the Heian period were largely cultural. There was a flourishing of art and literature in the period, and a lot of that culture was created by women. The Tale of

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14:14

How Does Public Health Tackle Outbreaks? Crash Course...

CrashCourse ·

2026/09/27

Public health activities are all the ways society coordinates to deliver better health to people. That may sound super broad, and it is, so in this episode of Crash Course Outbreak Science, we'll take a look at public health works to prevent outbreaks. We'll learn what public health is and what public health agencies do, look at the three tiers of public health responses, and revisit one of our favorite fictional cities to see these responses in action.This episode of Crash Course Outbreak Science

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15:58

The Nervous System, Part 2 - Action! Potential!:...

CrashCourse ·

2026/09/27

What do you and a sack of batteries have in common? Today, Hank explains.Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: https://apple.co/3d4eyZoDownload it here for Android Devices: https://bit.ly/2SrDulJChapters:Introduction: What do Neurons Do? 00:00Your Body is a Sack of Batteries 1:18How Electricity Works Inside Your Nervous System 3:18Sodium-Potassium Pump 4:04Types of Ion Channels:

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16:34

More EAS and Benzylic Reactions: Crash Course Organic...

CrashCourse ·

2026/09/27

We’ve already learned a lot about electrophilic aromatic substitution (EAS) and benzene, but guess what? There’s even more to learn! In this episode of Crash Course Organic Chemistry we’ll revisit our old friends the Friedel-Crafts reactions and learn some of their limitations and look at where substitution happens when there are multiple directing groups on a benzene ring. Plus we’ll introduce some benzylic reactions!Episode Sources:Master Organic Chemistry: Reactions on the “Benzylic” Carbon:

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12:12

Congressional Elections: Crash Course Government and...

CrashCourse ·

2026/09/26

This week Craig Benzine talks about the importance of elections in the strongest branch of the U.S. Government: Congress. He'll talk about the frequency of elections in the Senate and House, the typical characteristics of a candidate, and the motivating factors our congresspeople follow to get re-elected.Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudiosSupport is provided by Voqal: http://www.voqal.orgChapters:Introduction: Congressional Elections 00:00How

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17:19

The Red Summer of 1919: Crash Course Black American...

CrashCourse ·

2026/09/26

During the Red Summer of 1919 violence against Black people broke out across the United States. Black people and neighborhoods were attacked in Washington DC, Chicago, Tulsa, and many other cities and towns across the country. Post-war tension over jobs and civil rights and population shifts like the Great Migration led white Americans to lash out.Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935SOURCES:Adrianne Lentz-Smith, Freedom Struggles: African

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13:17

The Gravity of the Situation: Crash Course Astronomy #7

CrashCourse ·

2026/09/26

In today's episode, Phil looks at how gravity plays out across the universe.This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourseCheck out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction 00:00Understanding Mass 1:11What is Gravity? 2:17Different Types of Orbit 3:41Escape Velocity 5:30Why Are Astronauts Weightless? 7:03Gravity Warps Space 8:17Review 8:43--PBS Digital Studios:

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16:08

How Does Disease Move? Crash Course Geography #34

CrashCourse ·

2026/09/26

From outbreaks of measles in the United States and cholera in Haiti to patterns of lead poisoning near gold mines in Nigeria, medical geographers play an important role in tracking disease in the landscape. Today, we're going to look at strategies medical geographers use to help as many people as possible achieve the highest level of health possible. Our sources: https://docs.google.com/document/d/1ldkfmEnwz4BCE76sxR1seA7d2L0jyVxX4Bc9YH0Tqog/edit?usp=sharing Watch our videos and review your

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17:55

Iran's Revolutions: Crash Course World History 226

CrashCourse ·

2026/09/25

In which John Green teaches you about Iran's Revolutions. Yes, revolutions plural. What was the the1979 Iranian Revolution about? It turns out that Iran has a pretty long history of unrest in order to put power in the hands of the people, and the most recent revolution in 1979 was, at least at first, not necessarily about creating an Islamic state. It certainly turned out to be about that, but it was initially just about people who wanted to get rid of an oppressive regime. Listen up as John teaches

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16:52

Arts and Letters of the Harlem Renaissance: Crash...

CrashCourse ·

2026/09/25

The Harlem Renaissance was one of the richest, most vibrant, and most culturally generative artistic periods in American history and the work that emerged from that period continues to shape the landscape of American arts and letters today. In this episode, we’re going to explore some of the writers, artists, and musicians who turned Harlem into a world-renowned hub of art and culture, and delve into the factors that brought them all together in the first place.Clint's book, How the Word is Passed

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