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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

17:25

The Skeletal System: It's ALIVE! - CrashCourse...

CrashCourse ·

2026/09/12

Hank introduces us to the framework of our bodies, our skeleton, which apart from being the support and protection for all our fleshy parts, is involved in many other vital processes that help our bodies to function properly. Table of Contents1) Endoskeleton 2:032) Biolography 3:273) New Bone Formation 6:364) Bone Structure 8:005) Bone Remodeling 9:48References:Campbell Biology, 9th

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12:07

Introduction to Indigenous Knowledge : Ep 8 of Crash...

CrashCourse ·

2026/09/12

The scientific method isn’t the only way to gain knowledge—Native people have been learning and innovating in their own ways for millennia. In this episode of Crash Course Native American History, we’ll discover the ways Western science and Indigenous knowledge can braid together to create a better world.Introduction: Trees Talk 00:00Ways of Knowing 0:42Medicine Wheels 2:18Native Innovations 3:27Braiding Knowledge 4:49Native Ecology 6:32Review & Credits

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16:49

Haitian Revolutions: Crash Course World History #30

CrashCourse ·

2026/09/12

Ideas like liberty, freedom, and self-determination were hot stuff in the late 18th century, as evidenced by our recent revolutionary videos. Although freedom was breaking out all over, many of the societies that were touting these ideas relied on slave labor. Few places in the world relied so heavily on slave labor as Saint-Domingue, France's most profitable colony. Slaves made up nearly 90% of Saint-Domingue's population, and in 1789 they couldn't help but hear about the revolution underway in

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15:16

World War II, A War for Resources: Crash Course World...

CrashCourse ·

2026/09/12

In which John Green teaches you about World War II, and some of the causes behind the war. In a lot of ways, WWII was about resources, especially food. The expansionist aggression of both Germany and Japan was in a lot of ways about resources. There were other reasons, to be sure, but the idea that the Axis needed more food can't be ignored. Citation 1: Lizzie Collingham. The Taste of War: World War II and the Battle for Food. Penguin. New York. 2011. p 30Citation 2: Collingham. p 102---Learn more

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14:11

What are the Fish Wars and Why Do They Matter?: Ep 9...

CrashCourse ·

2026/09/12

What does food sovereignty mean—and why does it matter? In this episode of Crash Course Native American History, we’ll explore how Native peoples’ deep ties to their traditional foods splintered under colonization, and why many Native people are fighting to keep those foods in their communities or bring them back.Introduction: Billy Frank Jr. 00:00Traditional Foods 01:00Food & Colonization 02:46The Fish Wars 04:36Frybread & Food Sovereignty 06:55Food Sovereignty Today 08:27Review & Credits

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16:35

The Excretory System: From Your Heart to the Toilet -...

CrashCourse ·

2026/09/12

Hank takes us on a fascinating journey through our excretory system to learn how our kidneys make pee. Referenceshttp://www.emc.maricopa.edu/faculty/farabee/biobk/biobookexcret.htmlhttp://www.khanacademy.org/science/biology/v/the-kidney-and-nephronCampbell Biology, 9th ed. Table of Contents1) Homeostasis & Osmoregulation 00:002) Urea & Uric Acid 01:303) Kidneys 02:494) Nephron 03:405) Glomerulus 4:156) Bowman's Capsule 04:257) Proximal Convoluted Tubule 04:498) Biolography 06:169) Loop of Henle

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16:23

The Truth About Columbus’s “First Contact”: Ep 10 of...

CrashCourse ·

2026/09/12

In 1492 Columbus sailed the ocean blue…and drastically changed the lives of Native Americans forever. In this episode of Crash Course Native American History, we’ll unpack misconceptions around first contact between Europeans and Natives and explore how Native peoples are still resisting colonialism today.Introduction: The Taíno 00:00First Contact 0:46The Doctrine of Discovery 3:16"Virgin Soil" Epidemics 4:40The California Genocide 6:00Native Resistance 6:46The Taíno Today 9:17Review & Credits

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16:08

The French Revolution: Crash Course World History #29

CrashCourse ·

2026/09/12

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 French Revolution not being quite as revolutionary as it could have been. France endured multiple constitutions, the heads of heads of state literally rolled, and then they ended up with a megalomaniacal little emperor by the name of Napoleon. But how did all of

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15:22

From the Trail of Tears to Wounded Knee: Ep 11 of...

CrashCourse ·

2026/09/12

It’s time for the Eras Tour… well, the colonialism version. In this episode of Crash Course Native American History, we’ll unpack the history of the Treaty Era and the Reservation Era, and all the broken promises and ripple effects that came with them.Introduction: Wounded Knee Protest 00:00The Treaty Era 0:40The Reservation Era 1:28Manhattan & the Lenape 2:13The American Revolution 3:44Removal 4:50The Trail of Tears 6:06The End of the Treaty Era 7:08Wounded Knee 8:18Review & Credits

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16:07

The Digestive System: CrashCourse Biology #28

CrashCourse ·

2026/09/12

Hank takes us through the bowels of the human digestive system and explains why it's all about surface area.Table of Contents1) Surface Area to the Max! 3:212) Mouth to Esophagus 5:233) Stomach 6:384) Small Intestine 7:555) Large Intestine 9:44ReferencesCampbell Biology, 9th ed.http://www.sciencedaily.com/releases/2007/10/071008102334.htmCrash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourseWant to find Crash Course elsewhere on the

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15:17

The History of America’s Indian Boarding Schools: Ep...

CrashCourse ·

2026/09/12

What did it mean to “Kill the Indian, Save the Man”? In this episode of Crash Course Native American History, we’ll learn about assimilation and allotment: a period where the U.S. government tried to eliminate Native Americans by erasing their culture, their way of life, and their claim over the land.Introduction: Biden's Apology 00:00Assimilation 0:56Native Boarding Schools 2:37Allotment 4:44Effects of Assimilation & Allotment 8:32Review & Credits

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15:41

Tea, Taxes, and The American Revolution: Crash Course...

CrashCourse ·

2026/09/12

In which John Green teaches you about the American Revolution and the American Revolutionary War, which it turns out were two different things. John goes over the issues and events that precipitated rebellion in Britain's American colonies, and he also explores the ideas that laid the groundwork for the new American democracy. Find out how the tax bill from the Seven Years' War fomented an uprising, how the Enlightenment influenced the Founding Fathers, and who were the winners and losers in this

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16:25

Amines: Crash Course Organic Chemistry #46

CrashCourse ·

2026/09/12

Did you know that the fishier a fish smells, the longer it’s been out of the water? This is due to a chemical called trimethylamine, which is an amine, the class of organic compounds we’re discussing in this episode! Although they tend to be pretty stinky, amines are important in many fields like biochemistry, medicine, and agriculture. In this episode of Crash Course Organic Chemistry, we’ll explore amine formation and basicity, and revisit some old friends, imines and enamines!Episode

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16:00

The Indian Reorganization Act Explained: Ep 13 of...

CrashCourse ·

2026/09/12

Something big happened in 1934—but whether it was good or bad depends on who you ask. In this episode of Crash Course Native American History, we’ll unpack the ins and outs of the Indian Reorganization Act, the first piece of legislation that tried to right the wrongs of the U.S. government against Native Americans, and its ninety-year-long legacy.Introduction: The Navajo's Livestock 00:00The Meriam Report 0:52The Indian Reorganization Act 3:21The Ute Tribes of Colorado 6:08Downsides of the IRA

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15:54

Circulatory and Respiratory Systems - CrashCourse...

CrashCourse ·

2026/09/12

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.Table of Contents1) Respiratory System 00:482) Simple Diffusion 00:553) Respiratory Anatomy 02:35a) Trachea to Capillaries 03:104) Lung Function & Thoracic Diaphragm 04:375) Circulatory System 05:356) Circulatory Anatomy 05:54a) Left Ventricle to Capillary Beds 06:50b) Veins to Left Atrium 08:467)

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16:22

The Termination Act Explained: Ep 14 of Crash Course...

CrashCourse ·

2026/09/12

Termination and relocation might seem like totally unrelated policies—but they were part of the same disappearing act. In this episode of Crash Course Native American History, we’ll learn how terminating federal recognition for more than a hundred Native nations while encouraging Native people to move to cities served the same goals.Introduction: The Menominee 00:00Historical Context 0:38The Urban Indian Relocation Program 3:03The Termination Act 3:56Terminating the Menominee 5:10Effects of

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13:47

The Amazing Life and Strange Death of Captain Cook:...

CrashCourse ·

2026/09/12

In which John Green teaches you about the life and death of one of history's great explorers, Captain James Cook of the British Navy. He charted large swaths of the Pacific ocean, laid claim to Australia and New Zealand, and died a bizarre death in the Sandwich Islands, which are now called the Hawaiian Islands. Exactly how and why Captain Cook was killed in Hawaii is a long-running historical debate. John presents two interpretations of the event and talks about what the differing interpretations

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14:10

The Native Civil Rights Movement: Ep 15 of Crash...

CrashCourse ·

2026/09/12

We’re in our self-determination era! In this episode of Crash Course Native American History, we’ll explore the activism that led to the biggest change in modern federal Indian policy, and how it affects Native nations today.Introduction: Alcatraz 00:00Indians of All Tribes 0:36The Self-determination Era 1:56Effects of Self-determination 3:58The Indian Child Welfare Act 6:37Problems with Self-determination 7:23Self-determination Today 8:55Review & Credits

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16:34

The Anthropocene and the Near Future: Crash Course...

CrashCourse ·

2026/09/11

In which John Green, Hank Green, and Emily Graslie teach you about the Anthropocene, an unofficial geological era that covers the last century or so, in which humanity has made massive progress. We've discovered the Higgs-Boson particle, and awesome electric cars, and amazing smartphones. So all this collective learning and progress has been good for everyone, right? Maybe not. We'll look at some of the pros and cons of all this "progress," including environmental impact, changes in the way people

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16:18

The Nervous System - CrashCourse Biology #26

CrashCourse ·

2026/09/11

Hank begins a series of videos on organ systems with a look at the nervous system and all of the things that it is responsible for in the body. References:http://webspace.ship.edu/cgboer/actionpot.htmlhttp://brainconnection.positscience.com/topics/?main=fa/zebrashttp://en.wikipedia.org/wiki/Myelin_sheath_gaphttp://www.bbc.co.uk/science/humanbody/body/factfiles/nervecellsandnerves/nerve_cells_and_nerves.shtmlCrash Course is on Patreon! You can support us directly by signing up at

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