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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

16:06

How Are Cities Organized? Crash Course Geography #46

CrashCourse ·

2026/09/09

Today we’re going to take a closer look at cities, examine how these large complex structures are organized, and identify patterns and differences in land use around the world. We'll begin with a quick recap of Central Place Theory, then we'll show you how the Concentric Zone Model can approximate the development of Chicago in the United States. Then, we'll take a closer look at colonial port cities, the development of industrial zones and financial districts, and the patchwork of immigrant

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15:57

Meiosis: Where the Sex Starts - Crash Course Biology #13

CrashCourse ·

2026/09/09

Hank gets down to the nitty-gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.References:http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20101/Bio%20101%20Lectures/Meiosis/meiosis.htmhttps://www.genome.gov/Glossary/index.cfm?p=viewimage&id=33http://www.sumanasinc.com/webcontent/animations/content/meiosis.htmlhttp://sun.menloschool.org/~dspence/biology/mit_meiosis/chapt11_15.htmlTable of Contents1) Homologous

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15:17

Statistical Thinking in Science: Crash Course...

CrashCourse ·

2026/09/09

We’re all gonna die someday. But can statistics help us know when? In this episode of Crash Course Scientific Thinking, we’ll learn how to interpret the statistics we see in our daily lives. And we’ll explore why we need stats to make informed judgments, be more precise about what we don’t know, and get closer to what we can know. Introduction: When Will I Die? 00:00Basic Statistics 0:44Confidence Intervals 4:14Relative & Absolute Risk 5:32Correlation vs. Causation 7:22Review & Credits 9:45Sources:

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17:07

Islam, the Quran, and the Five Pillars: Crash Course...

CrashCourse ·

2026/09/09

In which John Green teaches you the history of Islam, including the revelation of the Qu'ran to Muhammad, the five pillars of Islam, how the Islamic empire got its start, the Rightly Guided Caliphs, and more. Learn about hadiths, Abu Bakr, and whether the Umma has anything to do with Uma Thurman (spoiler alert: it doesn't). Also, learn a little about the split between Sunni and Shia Muslims, and how to tell if this year's Ramadan is going to be difficult for your Muslim friends. Let's try to keep

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13:05

Animals and Shapeshifters: Crash Course Latin...

CrashCourse ·

2026/09/09

Fish and insects and dogs—oh my! In this episode of Crash Course Latin American Literature, we’ll explore how all things fuzzy, buzzy, and ferocious can help us understand our own human nature. Introduction: Latin American Animals 00:00António Vieira 0:46Alejo Carpentier 3:34Pilar Quintana 6:27Review & Credits 8:54Sources: https://docs.google.com/document/d/1eE7g4-k6PD7C6wNBzeJIO8GCDHpoJl8ldDjKyq_2yYg/edit?tab=t.0To learn more, check out these videos:https://www.youtube.com/watch?v=oyv-eJRRozs

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14:02

Mitosis: Splitting Up is Complicated - Crash Course...

CrashCourse ·

2026/09/09

Hank describes mitosis and cytokinesis - the series of processes our cells go through to divide into two identical

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13:23

How has technology influenced literature?: Crash...

CrashCourse ·

2026/09/08

Science and technology have existed in Latin America since well before Columbus arrived. But how have they impacted literature? In this episode of Crash Course Latin American Literature, we’ll trace technological developments from the calendars of the Maya to WWII’s weapons of mass destruction—and uncover the creative ways writers have responded to them.Introduction: A QR Poem 00:00STEM in Pre-Colonial Latin America 0:53"El Eclipse" 1:47Creacionismo & "Altazor" 2:31The Crack Movement 5:42"En Busca

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16:58

Fall of The Roman Empire...in the 15th Century: Crash...

CrashCourse ·

2026/09/08

In which John Green teaches you about the fall of the Roman Empire, which happened considerably later than you may have been told. While the Western Roman Empire fell to barbarians in 476 CE, the Byzantines in Constantinople continued the Eastern Empire nicely, calling themselves Romans for a further 1000 years. Find out what Justinian and the rest of the Byzantine emperors were up to over there, and how the Roman Empire dragged out its famous Decline well into medieval times. In addition to all

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15:15

How Does Science Really Work? The Myth of the Great...

CrashCourse ·

2026/09/08

Sometimes experiments radically change our understanding of the world. But there’s much more to them than singular scientists. In this episode of Crash Course Scientific Thinking, we’ll learn why Louis Pasteur wasn’t a lone genius, and why it’s very difficult to design a study that gets us closer to the truth.Introduction: A Lone Genius 00:00The Scientific Community 0:32Louis Pasteur & Germ Theory 1:20Pasteur's Next Experiments 3:55Observational Science 6:08Ethical Experimentation 7:57Review &

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18:22

DNA, Hot Pockets, and The Longest Word Ever: Crash...

CrashCourse ·

2026/09/08

Hank imagines himself breaking into the Hot Pockets factory to steal their secret recipes and instruction manuals in order to help us understand how the processes known as DNA transcription and translation allow our cells to build proteins.Table of Contents:1) Transcription 2:12 A) Transcription Unit 3:00 B) Promoter 3:10 C) TATA Box 3:32 D) RNA Polymerase 4:12 E) mRNA 4:15 F) Termination signal 5:21 G) 5' Cap & Poly-A Tail 5:342) RNA Splicing 6:08 A) SNuRPs & Spliceosome 6:26 B)

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13:58

Peer Review and the Quest for Truth: Crash Course...

CrashCourse ·

2026/09/08

In 2010, a NASA-backed study boldly announced that we’d found alien life right here on Earth. So where are all these aliens? In this episode of Crash Course Scientific Thinking, we search for the truth and learn how science is an ongoing quest for knowledge that double-checks itself through peer review.Introduction: Alien Life? 00:00Arsenic-based Life 0:28Peer Review 2:55Replication 6:06The Scientific Process 8:25Review & Credits 9:25Sources:

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15:51

Christianity from Judaism to Constantine: Crash...

CrashCourse ·

2026/09/08

In which John Green teaches you the history of Christianity, from the beginnings of Judaism and the development of monotheism, right up to Paul and how Christianity stormed the Roman Empire in just a few hundred years. Along the way, John will cover Abram/Abraham, the Covenant, the Roman Occupation of Judea, and the birth, life, death, and legacy of Jesus of Nazareth. No flame wars! Let's keep the commentary civil.Chapters: Introduction: The Son of God 00:00Understanding the Jewish Tradition

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17:29

Biochemical Building Blocks and Fischer and Haworth...

CrashCourse ·

2026/09/08

Although we've spent a lot of time in this series looking at human-made organic chemicals, the term "organic chemistry" was originally used to describe molecules isolated from living things. In this episode of Crash Course Organic Chemistry, we're going back to our roots to learn more about the best synthetic chemists: living things. We'll look at the biochemical building blocks of life from the nitrogenous bases, sugars, and phosphate groups that make up DNA and RNA, to amino acids and lipids, and

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14:10

Film and Literature: Crash Course Latin American...

CrashCourse ·

2026/09/08

Lights, camera, action! Latin American literature intersects with all sorts of other kinds of art, including film. In this episode of Crash Course Latin American Literature, we explore the exchange between these two art forms, and how one piece of pop culture can help illuminate another.Introduction: At the Movies 00:00Manuel Puig 0:35Alberto Fuguet & McOndo 3:49Book-to-Screen Adaptations 7:46Review & Credits 10:05Sources:

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16:49

DNA Structure and Replication: Crash Course Biology #10

CrashCourse ·

2026/09/08

Hank introduces us to that wondrous molecule deoxyribonucleic acid - also known as DNA - and explains how it replicates itself in our cells.References:

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13:40

Reading and Writing Latin American literature: Crash...

CrashCourse ·

2026/09/08

Literature doesn’t begin and end when a writer puts words on a page. In our final episode of Crash Course Latin American Literature, we’ll explore how literature is shaped by readers and translators, too.Introduction: A Mysterious Library 00:00"La Biblioteca de Babel" 0:39Roberto Bolaño 3:14Translation 5:20Review & Credits 8:56Sources: https://docs.google.com/document/d/1eE7g4-k6PD7C6wNBzeJIO8GCDHpoJl8ldDjKyq_2yYg/edit?tab=t.0To learn more, check out these

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16:40

The Roman Empire. Or Republic. Or...Which Was It?:...

CrashCourse ·

2026/09/08

In which John Green explores exactly when Rome went from being the Roman Republic to the Roman Empire. Here's a hint: it had something to do with Julius Caesar, but maybe less than you think. Find out how Caesar came to rule the empire, what led to him getting stabbed 23 times on the floor of the senate, and what happened in the scramble for power after his assassination. John covers Rome's transition from city-state to dominant force in the Mediterranean in less than 12 minutes. Well, Rome's

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14:13

How Scientists Build Consensus: Crash Course...

CrashCourse ·

2026/09/08

Why is there consensus around atoms existing, but not around if chocolate is good for you? In this episode of Crash Course Scientific Thinking, we’ll explore why there are still things we don’t know about topics we know a lot about, and why scientific consensus is the closest thing to “the truth.” Introduction: Scientific Uncertainty 00:00Scientific Consensus 0:33Atomic Theory 1:28Nutrition Science 4:21Changing Consensus 6:48Scientific Consensus in our Everyday Lives 7:26Review & Credits

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13:32

Heredity: Crash Course Biology #9

CrashCourse ·

2026/09/08

Hank and his brother John discuss heredity via the gross example of relative ear wax moistness.This video uses sounds from Freesound.org.References:http://www.mpiwg-berlin.mpg.de/en/research/projects/DeptIII_Cultural_History_Heredityhttp://www.pbs.org/wgbh/nova/genome/her_ari.htmlhttp://www.universityofcalifornia.edu/news/article/4465http://www.nytimes.com/2006/01/29/science/29cnd-ear.htmlhttp://udel.edu/~mcdonald/mythearwax.htmlCrash Course is on Patreon! You can support us directly by signing up

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13:55

Aggression vs. Altruism: Crash Course Psychology #40

CrashCourse ·

2026/09/08

In our final episode of Crash Course Psychology, Hank discusses the ideas of Aggression and Altruism. These two things are difficult to understand and explain so sit tight and get ready to run the gauntlet of human emotions. Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych! --Chapters:Introduction: Robber's Cave Experiment 00:00Conflict vs. Cooperation 2:26Aggression 3:05Genetic, Neurological, & Biochemical Reasons for Aggression

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712 results

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