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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

13:50

The Nervous System, Part 1: Crash Course Anatomy and...

CrashCourse ·

2026/09/25

Today Hank kicks off our look around MISSION CONTROL: the nervous system.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: Hank's Morning Routine 00:00Nervous System Functions: Sensory Input, Integration, and Motor Output 1:17Organization of Central and Peripheral Nervous Systems 2:16Neurons &

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15:30

Tyranny of the Map: Crash Course Geography #35

CrashCourse ·

2026/09/25

Today we’re going to talk about borders. Borders can bring people together, evoke passion and war, divide, conquer, and solidify power. We’re going to focus on the tyranny of the map which is what happens when those in power draw boundaries in ways that conflict with how people in that place want to be grouped. We’ll look at the repercussions of the Berlin Conference of 1884 on boundaries within Africa, take a closer look at continued political unrest in Mali, and look at how this can even happen at

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12:11

Constitutional Compromises: Crash Course Government...

CrashCourse ·

2026/09/24

In which Craig Benzine teaches you about the compromises met in ratifying the U.S. Constitution. The United States didn’t always have its current system of government. Actually, this is its second attempt. Craig will delve into the failures (and few successes) of the Articles of Confederation, tell you how delegates settled on a two-house system of representation, discuss the issues of slavery and population that have been embedded into our constitution, and fire up the clone machine to discuss how

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16:16

How Can Cooperation End an Outbreak? Crash Course...

CrashCourse ·

2026/09/24

In 1959, the WHO set out to eradicate smallpox, an ambitious goal that was achieved by 1980. But this goal wouldn't have been possible without coordination on all levels of society. In this episode of Crash Course Outbreak Science, we'll look at cooperation on the individual, community, and national scale and see how by working together we can improve outcomes during an outbreak, prevent future outbreaks, and even eradicate disease.This episode of Crash Course Outbreak Science was produced by

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16:14

Telescopes: Crash Course Astronomy #6

CrashCourse ·

2026/09/24

Today Phil explains how telescopes work and offers up some astronomical shopping advice.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction 00:00How do Telescopes Work? 0:47Refraction 2:50Magnification 3:48Resolution 4:28Reflectors 5:19What Kind of Telescope Should You Buy? 6:19Technology and the Light Spectrum 7:45Review 11:14--Crash Course is on Patreon! You can support us directly by signing up at

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18:12

Synthesis, Distillation, and Recrystallization: Crash...

CrashCourse ·

2026/09/24

We’re going back to the lab! So far we’ve learned some important lab techniques that organic chemists might use day to day, like chromatography and proton NMR, but there are even more to learn. In this episode of Crash Course Organic Chemistry, we’ll introduce some new lab techniques such as distillation and recrystallization and apply them to everything we’ve been learning about EAS reactions. And we’ll do some synthesis problems! Episode Sources:Gilbert, J. C., & Martin, S. F. (2015). Experimental

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13:11

The Integumentary System, Part 2 - Skin Deeper: Crash...

CrashCourse ·

2026/09/23

Today, Hank answers the question, "Why do we use lotion?" We'll take a look at your integumentary system and all the hard work it does to protect you from and help you interact with the world around you. 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: Why Do We Use Lotion? 00:00Protective &

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14:12

How Can Infrastructure Help Us Stop Outbreaks? Crash...

CrashCourse ·

2026/09/23

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 outbreaks! Toilets are a part of infrastructure, the important system that we'll be talking about in this episode of Crash Course Outbreak Science. We'll look at how from physical infrastructure, from toilets, to sewers, to roads, and more, creates healthier environments for

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12:29

Federalism: Crash Course Government and Politics #4

CrashCourse ·

2026/09/23

In which Craig Benzine teaches you about federalism, or the idea that in the United States, power is divided between the national government and the 50 state governments. Craig will teach you about how federalism has evolved over the history of the US, what powers are given to the federal government, and what stuff the states control on their own. And he punches an eagle, which may not surprise you at all.Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudiosSupport

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17:46

Political Thought in the Harlem Renaissance: Crash...

CrashCourse ·

2026/09/23

When we think about the Harlem Renaissance, the arts come immediately to mind. But new political theories were also blossoming during this time. We've talked about Booker T. Washington and W.E.B. DuBois, but today we'll get into some other thinkers with different ideas about civil rights, fair labor practices, and Black nationalism.Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935SourcesAngela Davis, Blues Legacies and Black Feminism: Gertrude ‘Ma’

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13:46

Eclipses: Crash Course Astronomy #5

CrashCourse ·

2026/09/22

The big question in the comments last week was, "BUT WHAT ABOUT ECLIPSES?" Today, Phil breaks 'em down for you.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--As promised, Phil's sun spotting recommendations:Astronomers Without Borders (charitable org):

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16:40

What Holds a Country Together or Tears it Apart?...

CrashCourse ·

2026/09/22

Today we’re going to talk about the forces that affect a country’s stability. We’ll take a closer look at Costa Rica, Venezuela, Cuba, and Brazil and examine how the cohesiveness of these Latin American countries varies dramatically even though they are in a region with similar characteristics. As you’ll see, a country is like a figure skater, and maintaining peace and stability is much like a pair performing a “death spiral” balancing the forces attempting to pull a country apart and keep it

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16:28

War and Nation Building in Latin America: Crash...

CrashCourse ·

2026/09/22

In which John Green teaches you about nation-building and nationalism in Latin America. Sometimes, the nations of Latin America get compared to the nations of Europe and are found wanting. This is kind of a silly comparison. The rise of democratic, economically powerful nations in Europe came about under a very different set of circumstances than the way nations arose in Latin America, so the regions are necessarily a lot different. But why? John will explore whether it was a lack of international

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15:26

What Is Outbreak Culture? Crash Course Outbreak...

CrashCourse ·

2026/09/22

When we think of how we respond to outbreaks, we often think of physical things like vaccines or medicines, but there is another factor that is just as critical to understand: culture! Culture determines how we collaborate and use the resources at our disposal in the face of an outbreak. So in this episode of Crash Course Outbreak Science, we'll look at the ways culture impacts our outbreak response, and in turn how outbreaks can change our cultures.This episode of Crash Course Outbreak Science was

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12:54

The Integumentary System, Part 1 - Skin Deep: Crash...

CrashCourse ·

2026/09/21

Anatomy & Physiology continues with a look at your biggest organ - your skin.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: All About Skin 00:00Skin Layers: Epidermis, Dermis, & Hypodermis 1:30Types of Epidermal Cells: Keratinocytes, Melanocytes, Langerhans Cells, and Merkel Cells 2:15Layers

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17:17

Conjugation and UV-Vis Spectroscopy: Crash Course...

CrashCourse ·

2026/09/21

Carrots get their orange-y color from, you guessed it, an organic chemical. This chemical, called beta carotene, gets its pigment from its conjugated electron system. We’ve talked some already about conjugation, but in this episode of Crash Course Organic Chemistry we’ll go even deeper and look at how conjugation stabilizes molecules and how p orbitals can overlap to form pi molecular orbitals of different energy levels. Plus we’ll learn what UV spectroscopy can show us about conjugated

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11:45

Separation of Powers and Checks and Balances: Crash...

CrashCourse ·

2026/09/21

In which Craig Benzine teaches you about the US Governments Separation of powers and the system of checks and balances. In theory, the Legislative Branch, the Executive Branch, and the Judicial Brach are designed to keep each other in check and to keep any branch from becoming too powerful. In reality, the system was designed to keep the President from becoming some kind of autocrat. For the most part, it has worked. Craig will call in the clones to explain which powers belong to which branches and

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16:07

The Great Depression: Crash Course Black American...

CrashCourse ·

2026/09/21

During economic crises, marginalized communities are more susceptible to the harm and struggle that come with these downturns. Today we'll talk about the Great Depression, which lasted from 1929 until the US entered World War II. This depression profoundly changed the US economy, and we'll focus on how the depression impacted Black Americans. Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935VIDEO SOURCES● Cheryl Lynn Greenberg, To Ask for an Equal

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13:00

Moon Phases: Crash Course Astronomy #4

CrashCourse ·

2026/09/20

In this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Moon's phases.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Why does the Moon Have Phases? 00:00New Moon 2:26Waxing Crescent 4:17First Quarter 4:35Waxing Gibbous 5:15Full Moon 5:32Waning Gibbous, Third Quarter, and Waning Crescent 6:26Earthshine 7:20Review 8:58--PBS Digital Studios:

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16:12

What are the Patterns of Border Conflicts? Crash...

CrashCourse ·

2026/09/20

Today, we’re going to take a closer look at borders and the stories they tell. When we look at a map, the shapes we’re seeing can seem so permanent, but a map is just a snapshot of the Earth at a particular time, and by looking a countries shape (and how it has changed across time) we can learn so much about how power moves and the ebb and flow of conflict. We’ll talk about the different types of borders, and power dynamics at play in Armenia and Azerbaijan and even look to the oceans as we explore

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694 results

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