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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

15:32

The Vikings! - Crash Course World History 224

CrashCourse ·

2026/09/20

In which John Green teaches you about Vikings! That's right, one of our most requested subjects, the Vikings, right here on Crash Course. So what's the deal with Vikings? Well, the stuff you've heard about them may not be true. The Vikings weren't just pagan raiders striking terror into the hearts of defenseless European Christendom. They were some of the greatest travelers of their time, and they weren't always traveling to steal. In a lot of cases, they were traveling to trade. John will teach you

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15:31

How do Outbreaks End? Vaccines and Recovery: Crash...

CrashCourse ·

2026/09/20

Throughout this series, and in our real lives, we've seen the chaos and devastation that outbreaks can cause. But there's good news! Eventually, outbreaks come to an end. In this episode, we'll look at some of the important tools of outbreak response, particularly vaccines, and also discuss the important work that happens in the aftermath of an outbreak.This episode of Crash Course Outbreak Science was produced by Complexly in partnership with Operation Outbreak and the Sabeti Lab at the Broad

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12:57

Tissues, Part 4 - Types of Connective Tissues: Crash...

CrashCourse ·

2026/09/19

Today Hank wraps up our look at connective tissues with a discussion of their various types. Also chicken.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: We're All Just Meat 00:00Loose vs. Dense Connective Tissue Proper 2:10Types of Loose Tissue Proper: Areolar, Adipose, and Reticular

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16:23

Capitalism, Communism, and Political Economies: Crash...

CrashCourse ·

2026/09/19

Just like many great duos throughout history, Bulgaria and Germany have a fascinating (though uneven) relationship. In today’s episode, we’re going to take a closer look at the impact of politics on economies as we trace this history of Bulgaria and Germany following World War II, and examine the ways capitalism, and communism, impacted their economic strength today. SOURCESGeneralGetis, Bjelland, and Getis. Introduction to Geography, 15 ed. McGraw-Hill Education. 2017. ISBN:

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12:19

The Bicameral Congress: Crash Course Government and...

CrashCourse ·

2026/09/19

In which Craig Benzine teaches you about the United States Congress, why it's bicameral, and what bicameral means. Craig tells you what the Senate and House of Representatives are for, talks about some of the histories of the institutions, and reveals to you just how you can become a representative. It's not that easy. But an eagle gets punched, so there's that.Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudiosSupport is provided by Voqal:

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16:08

How Are We All Part of Ending Outbreaks? Crash Course...

CrashCourse ·

2026/09/19

Over the course of this series, we've seen that outbreak science is actually MANY sciences, including biology, epidemiology, sociology, and even economics! Because outbreak science is an interdisciplinary field, everyone has a role to play in ending outbreaks, including you! In this final episode of Crash Course Outbreak Science, we'll take a look at how different fields come together to prepare for and prevent outbreaks.This episode of Crash Course Outbreak Science was produced by Complexly in

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12:43

Cycles in the Sky: Crash Course Astronomy #3

CrashCourse ·

2026/09/18

This week we build on our naked eye observations from last week and take a look at the cyclical phenomena that we can see at work in the universe.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction 00:00Cycles in the Sky 0:42The Zodiac 2:10Planetary Movement 2:59The Earth's Axis 3:36Precession 6:09Things We've Learned From Naked Eye Observations 7:09Review 8:40--PBS Digital Studios:

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17:15

The Diels-Alder and Other Pericyclic Reactions: Crash...

CrashCourse ·

2026/09/18

Going out in the sun can work wonders for your mood, but unfortunately too much UV exposure can do serious damage to your DNA. This damage occurs through a type of organic reaction called a pericyclic reaction. In this episode of Crash Course Organic Chemistry, we’ll explore pericyclic reactions to see how the sun can both give us life, and hurt us, and also look at other important pericyclic reactions, such as the Diels-Alder reaction.Episode

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17:07

Conflict in Israel and Palestine through 2015: Crash...

CrashCourse ·

2026/09/18

*This video was published in 2015 and therefore does not reflect recent historical events, nor context about the ongoing conflict between Israel and Palestine.*In which John Green teaches you about the conflict in Israel and Palestine. This conflict is often cast as a long-term beef going back thousands of years, rooted in a clash between religions. Well, that's not quite true. What is true is that the conflict is immensely complicated, and just about everyone in the world has an opinion about it

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18:02

The Tuskegee Experiment: Crash Course Black American...

CrashCourse ·

2026/09/18

From 1932 to 1972, the United States Public Health Service and the Centers for Disease Control and Prevention operated an extremely unethical medical experiment on the effects of outcomes of untreated syphilis. Hundreds of poor Black men from Macon County, Alabama were enrolled in the study, and treatment for syphilis was withheld from them. Even after antibiotics became available that could cure syphilis, these men were left to suffer from the disease and expose their families to syphilis as well

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13:43

Tissues, Part 3 - Connective Tissues: Crash Course...

CrashCourse ·

2026/09/17

On today's episode of Crash Course Anatomy & Physiology, Hank continues our exploration of tissues, with an introduction to your connective tissues.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 00:00What is Connective Tissue? 2:14Four Classes of Connective Tissue 2:34What Makes Connective

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13:18

Zora Neale Hurston: Crash Course Black American...

CrashCourse ·

2026/09/17

The Harlem Renaissance produced many remarkable artists, writers, and thinkers. Today we'll talk about one of the most interesting minds of the time, Zora Neale Hurston. Hurston was an anthropologist by training and spent much of her career studying and documenting the lives of Black people in the southern US. She later went on to write several remarkable novels, including Their Eyes Were Watching God, which we discussed in Crash Course Literature.

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8:31

Introduction: Crash Course U.S. Government and Politics

CrashCourse ·

2026/09/17

In which Craig Benzine introduces a brand new Crash Course about U.S. Government and Politics! This course will provide you with an overview of how the government of the United States is supposed to function, and we'll get into how it actually does function. The two aren't always the same thing. We'll be learning about the branches of government, politics, elections, political parties, pizza parties, and much, much more!Produced in collaboration with PBS Digital Studios:

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16:34

Enols and Enolates - Reactivity, Halogenation, and...

CrashCourse ·

2026/09/17

You may know that cows produce methane, which is a big concern when it comes to global heating, but did you know that organic chemistry provides a potential solution to this problem? Feeding cows small amounts of red seaweed can greatly reduce methane emissions, in part due to organic chemicals called enols! In this episode of Crash Course Organic Chemistry, we’ll learn all about enols and enolates, their reactivity, and reactions we can do with them including halogenation and alkylation.Episode

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15:31

Naked Eye Observations: Crash Course Astronomy #2

CrashCourse ·

2026/09/16

Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction: Naked Eye Observations 00:00Classifying Stars by Magnitude 2:08Star Colors 2:24Constellations 3:09Names of Stars 4:34Light Pollution 5:16Why Do Stars Twinkle? 6:40Naked-Eye Planets 7:07The Sky's Motion 7:25Which

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16:50

World War II: Black American History #31

CrashCourse ·

2026/09/16

Black Americans have long fought in America's wars, very often fighting for a country that doesn't always fight for them. Today we'll learn about the experience of Black Americans in World War II. We'll look at the ways Black men and women served in the armed services during the war, and look at life on the homefront.Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935SOURCES:Chateauvart, Melinda, Marching Together: Women of the Brotherhood of Sleeping Car

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15:23

Water and Classical Civilizations: Crash Course World...

CrashCourse ·

2026/09/16

In which John Green teaches you about water! So, we talk about resources a lot on Crash Course, and today is no exception. It turns out people can't live without water, which means it's absolutely necessary for civilization. Today John talks about water in the context of classical civilizations, but not like Greece or Rome or something. We're talking about the Maya civilization in Central America, and the Khmer civilization in what is now Cambodia. So this is an awesome video, OK? Citation 1: Steven

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16:33

Colonialism: Crash Course Geography #39

CrashCourse ·

2026/09/16

Empire, imperialism, and colonialism are all interrelated tactics of geopolitics that are used to achieve similar goals of one state maintaining economic, political, or even cultural dominance over other territories. Today, we’re going to unravel the impacts of colonialism at different times throughout history from Taiwan to Myanmar as we examine the longstanding impacts of these relationships. We’ll also take a look at how some countries today, like Thailand, have taken the control of the narrative

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13:30

Tissues, Part 2 - Epithelial Tissue: Crash Course...

CrashCourse ·

2026/09/15

Today on Crash Course Anatomy & Physiology, Hank breaks down the parts and functions of one of your body's unsung heroes: your epithelial tissue.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 00:00Proper Epithelium & Glandular Epithelium 1:38We're All Just Tubes! 2:12Cell Shapes: Squamous,

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16:49

The Aldol and Claisen Reactions: Crash Course Organic...

CrashCourse ·

2026/09/15

Organic chemistry is a great workout for your brain, and to keep its energy up, your brain needs glucose. To maintain blood glucose levels, our bodies go through a process called gluconeogenesis, which involves the important type of organic reaction we’re getting into today: aldol reactions! In this episode of Crash Course Organic Chemistry, we’ll learn what an aldol is, as well as how aldol reactions work and what they do. Plus we’ll learn about a similar reaction, Claisen condensation.Episode

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