In which John Green teaches you, at long last, about the most exceptional bunch of empire-building nomads in the history of the world, the Mongols! How did the Mongols go from being a relatively small band of herders who occasionally engaged in some light hunting-gathering to being one of the most formidable fighting forces in the world? It turns out Genghis Khan was a pretty big part of it, but you probably already knew that. The more interesting questions might be, what kind of rulers were they, and what effect did their empire have on the world we know today? Find out, as John FINALLY teaches you about the Mongols.

Chapters:
Introduction: Wait for it...The Mongols! 00:00
What does it mean to be a nomad? 1:13
Genghis Khan 2:39
An Open Letter to Genghis Khan's Descendants 4:45
The Mongols After Genghis Khan 5:30
Five Reasons the Mongols Were Awesome 6:54
Five Reasons the Mongols Weren't Awesome 8:30
Credits 10:34

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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Today we’re rounding out our planetary tour with ice giants Uranus and Neptune. Both have small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue. Uranus has a truly weird rotation and relatively dull weather, while Neptune has clouds and storms whipped by tremendous winds. Both have rings and moons, with Neptune’s Triton probably being a captured iceball that has active geology.

This episode was brought to you by Squarespace http://www.squarespace.com/crashcourse

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron

--
Chapters:
Introduction: Uranus 00:00
Uranus's Structure 1:35
Uranus's Atmosphere 2:53
Uranus's Weird Tilt 3:55
Uranus's Moons 5:12
Uranus's Rings 6:00
Neptune's Structure 6:35
Neptune's Atmosphere 7:02
Neptune's Magnetic Field & Rings 8:10
Triton: Neptune's Largest Moon 8:36
The Discovery of Neptune 9:52
Review 11:27
--

PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Follow Phil on Twitter: https://twitter.com/badastronomer

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--

PHOTOS/VIDEOS
Uranus http://en.wikipedia.org/wiki/V....oyager_2#/media/File [credit: NASA/JPL/Voyager mission]
Neptune https://www.nasa.gov/content/2....5-years-ago-voyager- [credit: NASA]
King George III http://en.wikipedia.org/wiki/G....eorge_III_of_the_Uni
Uranus from Earth picture by Phil Plait
Uranus, Earth size comparison http://en.wikipedia.org/wiki/F....ile:Uranus,_Earth_si [credit: NASA]
Uranus core, reconstructed from http://en.wikipedia.org/wiki/F....ile:Uranus-intern-en [credit: Wikimedia Commons]
Uranus http://www.spacetelescope.org/....static/archives/imag [credit: NASA, ESA, L. Sromovsky and P. Fry (University of Wisconsin), H. Hammel (Space Science Institute), and K. Rages (SETI Institute)]
Uranus storms http://www.keckobservatory.org..../images/made/images/ [credit: Imke de Pater (UC–Berkeley)/Keck Observatory]
Uranus and rings (tilt demonstration) http://en.wikipedia.org/wiki/U....ranus#/media/File:Ur [credit: Hubble Space Telescope - NASA Marshall Space Flight Center]
Uranus with rings and moons http://www.eso.org/public/images/eso0237a/ [credit: ESO]
Miranda http://en.wikipedia.org/wiki/M....oons_of_Uranus#/medi [credit: NASA]
Verona Rupes http://apod.nasa.gov/apod/ap110404.html [credit: NASA]
Neptune’s Interior https://solarsystem.nasa.gov/m....ultimedia/display.cf [credit: Lunar and Planetary Institute]
Neptune clouds http://en.wikipedia.org/wiki/F....ile:Neptune_clouds.j [credit: NASA]
Neptune’s Great Dark Spot http://en.wikipedia.org/wiki/N....eptune#/media/File:N [credit: NASA / Jet Propulsion Lab]
Neptune’s Rings http://www.rolfolsenastrophoto....graphy.com/Astrophot [credit: Rolf Wahl Olsen / NASA/JPL (Voyager 2, NASA Planetary Data System)]
Triton http://en.wikipedia.org/wiki/T....riton_(moon)#/media/ [credit: NASA / Jet Propulsion Lab / U.S. Geological Survey]
Triton flipped http://en.wikipedia.org/wiki/F....ile:PIA01538_Triton_ [credit: NASA/JPL]
Triton Nitrogen Geysers http://en.wikipedia.org/wiki/T....riton_(moon)#/media/ NASA]

Today we're going to tell the story of a quiet revolution in the 1960s that shifted our entire understanding of how the Earth works. We currently believe that the Earth's broken outer shell rises from the mantle and folds back in - kind of like a dance of creative destruction and reconstruction - giving us our continents and oceans, mountains and valleys, volcanoes, and earthquakes. And it would take a group of scientists all over the world to get us this grand unifying theory of plate tectonics.

SOURCES
Petersen, et al 2011. Fundamentals of Physical Geography. Cengage
Christopherson, R.W. 2010. Elemental Geosystems. Prentice Hall. 6th edition
Strahler, A. 2011. Introducing Physical Geography. Wiley and Sons. 5th Edition
http://metrocosm.com/earth-19000bc-3000ad.html
https://dinosaurpictures.org/ancient-earth#750
https://earthsky.org/space/ear....th-as-seen-from-spac
https://oceanexplorer.noaa.gov..../explorations/lewis_
https://www.nationalgeographic.....org/encyclopedia/ri
ttps://www.ck12.org/earth-science/Oce....an-Ocean-Convergent-
https://www.reference.com/scie....nce/oceanic-oceanic-
http://www.geosci.usyd.edu.au/....users/prey/ACSGT/ERe

Watch our videos and review your learning with the Crash Course App!
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#CrashCourse #Geography #Tectonics

How does education work? Where does the money come from? Who pays for it? Is going to college a good investment? Adriene and Jacob are talking today about the economics of education. Most countries require that their citizens get some education, and most countries pay for basic education, but the quality of education can vary widely. And in the US, post-secondary education can come with a lot of costs.

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark, Eric Kitchen, Jessica Wode, Jeffrey Thompson, Steve Marshall, Moritz Schmidt, Robert Kunz, Tim Curwick, Jason A Saslow, SR Foxley, Elliot Beter, Jacob Ash, Christian, Jan Schmid, Jirat, Christy Huddleston, Daniel Baulig, Chris Peters, Anna-Ester Volozh, Ian Dundore, Caleb Weeks

--

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In which John Green teaches you, at long last, about the most exceptional bunch of empire-building nomads in the history of the world, the Mongols! How did the Mongols go from being a relatively small band of herders who occasionally engaged in some light hunting-gathering to being one of the most formidable fighting forces in the world? It turns out Genghis Khan was a pretty big part of it, but you probably already knew that. The more interesting questions might be, what kind of rulers were they, and what effect did their empire have on the world we know today? Find out, as John FINALLY teaches you about the Mongols.

Chapters:
Introduction: Wait for it...The Mongols! 00:00
What does it mean to be a nomad? 1:13
Genghis Khan 2:39
An Open Letter to Genghis Khan's Descendants 4:45
The Mongols After Genghis Khan 5:30
Five Reasons the Mongols Were Awesome 6:54
Five Reasons the Mongols Weren't Awesome 8:30
Credits 10:34

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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You may think you know all about hypnosis from the movies. Zoolander, The Manchurian Candidate, etc... but there's a whole lot more going on. In this episode of Crash Course Psychology, Hank tells us about some of the many altered states of consciousness, including hypnosis.

Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych

--
Chapters:
Introduction: Hypnosis & Altered States of Consciousness 00:00
Facts & Fallacies About Hypnosis 2:00
How does hypnosis work? 3:05
Drug Tolerance & Neuroadaptation 4:49
Psychoactive Drugs 5:51
Depressants 6:28
Stimulants 7:35
Hallucinogens/Psychedelics 9:04
Non-Drug Induced Hallucinations 9:33
Review & Credits 10:32
--

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In which Hank does some push-ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodies create energy in the form of ATP.

Special thanks go to Stafford Fitness (www.staffordfitness.net) for allowing us to shoot the gym scenes in their facilities.

This video uses sounds from Freesound.org

Table of Contents:
1) Cellular Respiration 01:00
2) Adenosine Triphosphate 01:29
3) Glycolysis 4:13
A) Pyruvate Molecules 5:00
B) Anaerobic Respiration/Fermentation 5:33
C) Aerobic Respiration 6:45
4) Krebs Cycle 7:06
A) Acetyl COA 7:38
B) Oxaloacetic Acid 8:21
C) Biolography: Hans Krebs 8:37
D) NAD/FAD 9:48
5) Electron Transport Chain 10:55
6) Check the Math 12:33

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In the aftermath of the revolutions and upheaval in 18th and early 19th century Europe, there was a hunger for reform across the continent. Reformers like Robert Owen, Charles Fourier, and Auguste Comte proposed radical new ideas, and at the same time, regular people began to stand up and ask for greater equality, and a louder voice in how they were governed. Results were mixed, but a lot of the ideas that emerged during this time are still echoing in our world today.

Sources

-Hosking, Geoffrey. Russia: People and Empire. Cambridge: Harvard University Press, 1997.
-Hunt, Lynn et al. The Making of the West: Peoples and Cultures. 6th ed. Boston: Bedford St. Martin’s, 2019.
-Judson, Pieter M. The Hapsburg Empire: A New History. Cambridge: Harvard University Press,
-Kent, Susan Kingsley. A New History of Britain: Four Nations and an Empire. New York: Oxford University Press, 2017.
-Sperber, Jonathan. Revolutionary Europe 1780-1850. 2nd ed. London: Routledge, 2017.

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Eric Prestemon, Sam Buck, Mark Brouwer, Indika Siriwardena, Avi Yashchin, Timothy J Kwist, Brian Thomas Gossett, Haixiang N/A Liu, Jonathan Zbikowski, Siobhan Sabino, Zach Van Stanley, Jennifer Killen, Nathan Catchings, Brandon Westmoreland, dorsey, Kenneth F Penttinen, Trevin Beattie, Erika & Alexa Saur, Justin Zingsheim, Jessica Wode, Tom Trval, Jason Saslow, Nathan Taylor, Khaled El Shalakany, SR Foxley, Sam Ferguson, Yasenia Cruz, Eric Koslow, Tim Curwick, David Noe, Shawn Arnold, William McGraw, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
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#crashcourse #history #europeanhistory

Dihydrogen monoxide (better known as water) is the key to nearly everything. It falls from the sky, makes up 60% of our bodies, and just about every chemical process related to life takes place with it or in it. Without it, none of the chemical reactions that keep us alive would happen - none of the reactions that sustain any life form on earth would happen - and the majority of inorganic chemical reactions that shape the surface of the earth would not happen either. Every one of us uses water for all kinds of chemistry every day - our body chemistry, our food chemistry, and our laundry chemistry all take place in water.

In today's Crash Course Chemistry, we use Hank's actual dirty laundry (ew) to learn about some of the properties of water that make it so special - its polarity and dielectric property; how electrolytes can be used to classify solutions; and we discover how to calculate a solution's molarity as well as how to dilute a solution using the dilution equation.

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/3d4eyZo
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Table of Contents
Polarity 02:40
Dielectric Property 04:13
Electrolytes 04:29
Molarity 08:46
Dilution 10:56

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Escape was one of the many ways that enslaved people resisted their captivity in the system of American slavery. The Underground Railroad was not literally a railroad. It was a network of people, routes, and safe houses that helped people escape from slavery in the south to freedom in the north. Today we'll talk about the origins of the Underground Railroad, the systems that helped people escape, and the people who helped along the route.

Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935

SOURCES
https://www.newyorker.com/maga....zine/2016/08/22/the-
http://www.pbs.org/black-cultu....re/shows/list/underg
https://www.nationalgeographic.....org/encyclopedia/un
https://www.theatlantic.com/ma....gazine/archive/2015/
https://www.nps.gov/subjects/u....ndergroundrailroad/w

Watch our videos and review your learning with the Crash Course App!
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Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Toni Miles, Oscar Pinto-Reyes, Erin Nicole, Steve Segreto, Michael M. Varughese, Kyle & Katherine Callahan, Laurel A Stevens, Evan Lawrence Henderson, Vincent, Michael Wang, Krystle Young, Michael Dowling, Alexis B, Rene Duedam, Burt Humburg, Aziz, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, JJurong, Eric Zhu, Alan Bridgeman, Rachel Creager, Jennifer Smith, Matt Curls, Tim Kwist, Jonathan Zbikowski, Jennifer Killen, Sarah & Nathan Catchings, Brandon Westmoreland, team dorsey, Trevin Beattie, Divonne Holmes à Court, Eric Koslow, Jennifer Dineen, Indika Siriwardena, Khaled El Shalakany, Jason Rostoker, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Andrei Krishkevich, ThatAmericanClare, Rizwan Kassim, Sam Ferguson, Alex Hackman, Eric Prestemon, Jirat, Katie Dean, TheDaemonCatJr, Wai Jack Sin, Ian Dundore, Matthew, Justin, Jessica Wode, Mark, Caleb Weeks
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#crashcourse #history #undergroundrailroad

Check out Jabril's collab with "Above the Noise" about Deepfakes: https://www.youtube.com/watch?v=Ro8b69VeL9U
Today, we're going to talk about five common types of algorithmic bias we should pay attention to: data that reflects existing biases, unbalanced classes in training data, data that doesn't capture the right value, data that is amplified by feedback loops, and malicious data. Now bias itself isn't necessarily a terrible thing, our brains often use it to take shortcuts by finding patterns, but bias can become a problem if we don't acknowledge exceptions to patterns or if we allow it to discriminate.

Crash Course is produced in association with PBS Digital Studios:
https://www.youtube.com/pbsdigitalstudios

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Eric Prestemon, Sam Buck, Mark Brouwer, Efrain R. Pedroza, Matthew Curls, Indika Siriwardena, Avi Yashchin, Timothy J Kwist, Brian Thomas Gossett, Haixiang N/A Liu, Jonathan Zbikowski, Siobhan Sabino, Jennifer Killen, Nathan Catchings, Brandon Westmoreland, dorsey, Kenneth F Penttinen, Trevin Beattie, Erika & Alexa Saur, Justin Zingsheim, Jessica Wode, Tom Trval, Jason Saslow, Nathan Taylor, Khaled El Shalakany, SR Foxley, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, DAVID NOE, Shawn Arnold, William McGraw, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
--

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#CrashCourse #ArtificialIntelligence #MachineLearning

In which John Green teaches you about various reform movements in the 19th century United States. From Utopian societies to the Second Great Awakening to the Abolition movement, American society was undergoing great changes in the first half of the 19th century. Attempts at idealized societies popped up (and universally failed) at Utopia, OH, New Harmony, IN, Modern Times, NY, and many other places around the country. These utopians had a problem with mainstream society, and their answer was to withdraw into their own little worlds. Others didn't like the society they saw and decided to try to change it. Relatively new Protestant denominations like the Methodists and Baptists reached out to "the unchurched" during the Second Great Awakening, and membership in evangelical sects of Christianity rose quickly. At the same time, Abolitionist societies were trying to free the slaves. Americans of the 19th century had looked at the world they were living in and decided to change it.

Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode.
Of all of the reform movements of the 1800s, few were as impactful as the movement to abolish slavery: https://www.commonlit.org/text....s/the-revolutionary-
Women were heavily involved in the abolitionist movement and firsthand stories like freed slave Harriet Ann Jacobs' Incidents in the Life of a Slave Girl were important to the cause: https://www.commonlit.org/text....s/what-slaves-are-ta

Learn more about the abolitionist movement in Crash Course Black American History:
Maria Stewart (#14): https://youtu.be/nsVnWD5PrIg
Frederick Douglass (#17): https://youtu.be/7QOTexnD-NE

Chapters:
Introduction: Religious & Moral Reform Movements of the 19th Century 00:00
Shaker Communities 0:33
Latter Day Saints 1:21
Brook Farm 1:46
Other Utopian Communities 2:50
The 2nd Great Awakening 3:21
The Oneida Community 3:44
Values of the 2nd Great Awakening 4:25
The Temperance Movement 5:59
Asylums 7:02
Common Schools 7:29
The Abolitionist Movement 8:13
Resistance to the Abolitionist Movement 10:02
Abolitionist Writers 10:45
Mystery Document 11:40
Frederick Douglass 13:06
Credits 14:14

In which John Green teaches you about World War II, aka The Great Patriotic War, aka The Big One. So how did this war happen? And what does it mean? We've all learned the facts about World War II many times over, thanks to repeated classroom coverage, the History channel, and your grandfather (or maybe great-grandfather) showing you that Nazi bayonet he used to keep in his sock drawer and telling you a bunch of age-inappropriate stories about his harrowing war experiences. So, why did the Axis powers think forceful expansion was a good idea? (they were hungry). So why did this thing shake out in favor of the Allies? Hint: it has to do with the fact that it was a world war. Germany and Japan made some pretty serious strategic errors, such as invading Russia and attacking the United States, and those errors meant that pretty much the whole world was against them. So, find out how this worldwide alliance came together to stop the Axis expansion. All this, plus Canada finally gets the respectful treatment it deserves. Oh, and a warning: there are a few graphic images in this episode. Sensitive viewers may want to use caution, especially around the 9:15 mark.

Chapters:
Introduction: WWII 00:00
When did WWII start? 0:36
The European Theater of World War II 1:52
1941 Was Kind of a Bad Year 3:47
The Battle of Stalingrad 5:29
An Open Letter to Canada 6:41
The End of World War II 7:45
The Hunger Plan 8:16
The Casualties of WWII 10:48
Credits 12:21


Interested in learning more about WWII? Check out these other videos from Crash Course:
World War II Part 1: Crash Course US History 35 https://www.youtube.com/watch?v=Objoad6rG6U
World War II Part 2 - The Homefront: Crash Course US History 36 https://www.youtube.com/watch?v=HofnGQwPgqs
World War II, A War for Resources: Crash Course World History 220 https://www.youtube.com/watch?v=H-2q-QMUIgY
World War II: Crash Course European History 38 https://www.youtube.com/watch?v=Hs_JMydrxZM
World War II Civilians and Soldiers: Crash Course European History 39 https://www.youtube.com/watch?v=rlx6ur_D51s
Post-World War II Recovery: Crash Course European History 42 https://www.youtube.com/watch?v=nlp068CmQaE
World War II: Black American History 31 https://www.youtube.com/watch?v=U7wrwPnQVg4

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In which John Green teaches you about the United States Constitution. During and after the American Revolutionary War, the government of the new country operated under the Articles of Confederation. While these Articles got the young nation through its war with England, they weren't of much use when it came to running a country. So, the founding fathers decided to try their hand at nation-building, and they created the Constitution of the United States, which you may remember as the one that says We The People at the top. John will tell you how the convention came together, some of the compromises that had to be made to pass this thing, and why it's very lucky that the framers installed a somewhat reasonable process for making changes to the thing. You'll learn about Shays' Rebellion, the Federalist Papers, the elite vs rabble dynamic of the houses of congress, and start to find out just what an anti-federalist is.

Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode. Founding Fathers debated over how to govern the new nation, beginning with the Articles of Confederation: https://www.commonlit.org/text....s/articles-of-confed
When the Founding Fathers finally wrote the Constitution, they realized that they needed to add The Bill of Rights to get citizens on board with the new government: https://www.commonlit.org/texts/the-bill-of-rights

Want to learn more about our government's structure? Watch Crash Course US Government & Politics here: https://www.youtube.com/watch?v=lrk4oY7UxpQ&list=PL8dPuuaLjXtOfse2ncvffeelTrqvhrz8H

For a deeper look into The US Constitution, the 3/5 Compromise, and the Slave Trade Clause, check out Episode 9 of Crash Course Black American History: https://youtu.be/57xUbch1viI

Chapters:
Introduction 00:00
The Articles of Confederation 0:34
What did the Articles of Confederation Accomplish? 2:10
Shay's Rebellion 3:12
The United States Constitution 4:24
The Great Compromise Establishes the Bicameral Congress 6:14
The 3/5ths Compromise 7:13
Checks and Balances 8:04
The Federalist papers 9:31
Mystery Document 10:16
What is the Second Amendment? 10:59
Anti-Federalists 11:32
Credits 12:31

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Propaganda! Misinformation! Disinformation! Today we’re talking about the dark – or, shall we say, darkER – side of media. Understanding these media bogeymen is essential to being a more media literate citizen.

***

Resources:

The Persistent Mystery: How Many Died in 1989? https://www.nytimes.com/1999/0....6/04/world/the-persi

The Media Was Always Bad at Reporting Breaking News, a Brief History https://www.theatlantic.com/na....tional/archive/2013/

How To Handle Rumors: http://egap.org/content/brief-31-how-handle-rumors

The Macedonian Teens Who Mastered Fake News https://www.wired.com/2017/02/....veles-macedonia-fake

We Tracked Down A Fake-News Creator In The Suburbs. Here's What We Learned https://www.npr.org/sections/a....lltechconsidered/201

Evaluating Information: The Cornerstone of Civic Online Reasoning https://stacks.stanford.edu/fi....le/druid:fv751yt5934

Social Clicks: What and Who Gets Read on Twitter? https://hal.inria.fr/hal-01281190

59 Percent Of You Will Share This Article Without Even Reading It https://www.forbes.com/sites/j....aysondemers/2016/08/

An Exercise to Sift for Sources Amid a Blitz of Fake News https://dotearth.blogs.nytimes.....com/2016/11/24/an-e

***

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Mark Brouwer, Glenn Elliott, Justin Zingsheim, Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, SR Foxley, Sam Ferguson, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, Evren Türkmenoğlu, D.A. Noe, Shawn Arnold, mark austin, Ruth Perez, Malcolm Callis, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, William McGraw, Bader AlGhamdi, Vaso, Melissa Briski, Joey Quek, Andrei Krishkevich, Rachel Bright, Alex S, Mayumi Maeda, Kathy & Tim Philip, Montather, Jirat, Eric Kitchen, Moritz Schmidt, Ian Dundore, Chris Peters, Sandra Aft, Steve Marshall
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In which John Green teaches you about founding father and third president of the United States, Thomas Jefferson. Jefferson is a somewhat controversial figure in American history, largely because he, like pretty much all humans, was a big bundle of contradictions. Jefferson was a slave-owner who couldn't decide if he liked slavery. He advocated for small government but expanded federal power more than either of his presidential predecessor. He also idealized the independent farmer and demonized manufacturing, but put policies in place that would expand industrial production in the US. Controversy may ensue as we try to deviate a bit from the standard hagiography/slander story that is usually told about old TJ. John explores Jefferson's election, his policies, and some of the new nation's (literally and figuratively) formative events that took place during Jefferson's presidency. In addition to all this, Napoleon drops in to sell Louisiana, John Marshall sets the course of the Supreme Court, and John Adams gets called a tiny tyrant.

Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode. Thomas Jefferson is remembered as the Founding Father responsible for saying all men are created equal in The Declaration of Independence: https://www.commonlit.org/text....s/the-declaration-of
Jefferson didn't always practice what he preached though, as seen in his mixed views on American Indians: https://www.commonlit.org/text....s/excerpts-from-thom

Chapters:
Introduction: Thomas Jefferson 00:00
The Election of 1800 0:42
Jefferson's Attitudes Towards Slavery 2:34
Gabriel's Rebellion and Other Slave Uprisings 3:47
Mystery Document 4:28
Jefferson's America 6:02
John Marshall, Judicial Review, and Marbury v. Madison 7:07
The Louisiana Purchase 8:32
Jefferson's Embargo 10:16
Jefferson's Complicated Legacy 12:03
Credits 12:46

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In which John Green teaches you about American involvement in World War I, which at the time was called the Great War. They didn't know there was going to be a second one, though they probably should have guessed, 'cause this one didn't wrap up very neatly. So, the United States stayed out of World War I at first, because Americans were in an isolationist mood in the early 20th century. That didn't last though, as the affronts piled up and drew the US into the war. Spoiler alert: the Lusitania was sunk two years before we joined the war, so that wasn't the sole cause for our jumping in. It was part of it though, as was the Zimmerman telegram, unrestricted submarine warfare, and our affinity for the Brits. You'll learn the war's effects on the home front, some of Woodrow Wilson's XIV Points, and just how the war ended up expanding the power of the government in Americans' lives.

Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode. The complex secret alliances of Europe led to World War I: https://www.commonlit.org/text....s/a-mad-dash-to-disa
It took several years before Americans joined the war: https://www.commonlit.org/text....s/to-the-front-lines
After the war, President Woodrow Wilson wanted to prevent a future World War, and promoted creating a League of Nations, established following the Treaty of Versailles: https://www.commonlit.org/text....s/the-treaty-of-vers

Chapters:
Introduction 00:00
American Involvement in WWI 0:41
The Sinking of the Lusitania 1:53
Why did the U.S. join WWI? 2:42
Mystery Document 3:22
America's Contributions to WWI 5:06
Pro-War Progressives 5:48
How WWI Expanded the U.S. Government's Power 6:08
Propaganda, Public Opinion, and the CPI 7:10
The Espionage Act of 1917 7:57
The Sedition Act 8:34
"Americanization" 9:55
Suppression of Free Speech 10:40
Positive Outcomes of WWI 11:18
The End of WWI 12:17
Credits 13:06

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Imagine if the only videos on YouTube were people looking for love. That could have been the world we lived in! Before it had 1.9 billion users per day, YouTube started as a video-based dating service, complete with the truly excellent catchphrase: “Tune in, Hook Up.”

The reason they didn’t flop is because they were willing to listen and fundamentally change their business when their original idea didn’t meet the needs of their market. They were clever observers and nimble enough to pivot.

***

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Eric Prestemon, Sam Buck, Mark Brouwer, Indika Siriwardena, Avi Yashchin, Timothy J Kwist, Brian Thomas Gossett, Haixiang N/A Liu, Jonathan Zbikowski, Siobhan Sabino, Zach Van Stanley, Jennifer Killen, Nathan Catchings, Brandon Westmoreland, dorsey, Kenneth F Penttinen, Trevin Beattie, Erika & Alexa Saur, Justin Zingsheim, Jessica Wode, Tom Trval, Jason Saslow, Nathan Taylor, Khaled El Shalakany, SR Foxley, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, David Noe, Shawn Arnold, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
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Today, Craig is going to give you an overview of civil rights and civil liberties. Often these terms are used interchangeably, but they are actually very different. Our civil liberties, contained in the Bill of Rights, once only protected us from the federal government, but slowly these liberties have been incorporated to protect us from the states. We’ll take a look at how this has happened and the supreme court cases that got us here.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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All attributed images are licensed under Creative Commons by Attribution 2.0

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Chemistry raised to the power of AWESOME! That's what Hank is talking about today with Electrochemistry. Contained within, Hank discusses electrochemical reactions, half-reactions, how batteries work, galvanic cells, voltage, standard reduction potential, cell potential, electrolysis, electroplating, and the things that go into making it possible for you to watch this episode of Crash Course Chemistry!

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
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--
Table of Contents

Electro-Chemical Reactions 0:13
Half Reactions 1:42
How Batteries Work 1:47
Galvanic Cells 3:18
Calculating Voltage 4:12
Standard Reduction Potential 4:42
Standard Cell Potential 6:03
Electrolysis 7:24
Electroplating 7:02
--

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This week Craig talks about police searches and seizures. Now, the fourth amendment says that you have the right to be protected against "unreasonable searches and seizures" but what exactly does this mean? Well, it's complicated. The police often need warrants issued with proof of probable cause, but this isn't always the case - such as when you're pulled over for a moving violation. We'll finish up with the limitations of these protections and discuss one group of people in particular that aren't protected equally - students.

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https://creativecommons.org/licenses/...

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I'm sure you've all heard about Isaac Newton and that apple that fell on his head and how that was a huge deal to our understanding of gravity. Well... let's talk about that. In this episode of Crash Course Physics, Shini sits down to talk about the realities of the apple story and how Newtonian Gravity is more than a little important.

***

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

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In which John Green teaches you about the Great Depression. So, everybody knows that the Great Depression started with the stock market crash in 1929, right? Not exactly. The Depression happened after the stock market crash, but wasn't caused by the crash. John will teach you about how the depression started, what Herbert Hoover tried to do to fix it, and why those efforts failed.

Hey teachers and students - Check out CommonLit's free collection of reading passages and curriculum resources to learn more about the events of this episode. The Roaring Twenties ended with The Great Depression, a period of soul-searching for the United States dealing with a failing middle class: https://www.commonlit.org/text....s/the-great-depressi
The issues of the Great Depression were made more difficult by the agricultural crisis known as the Dust Bowl: https://www.commonlit.org/text....s/excerpt-from-on-dr

Learn more about the Great Depression in episode #28 of Crash Course Black American History here: https://www.youtube.com/watch?v=f14kiGoexVg

Chapters:
Introduction: The Great Depression 00:00
Causes of the Great Depression 0:48
The Stock Market Crash 2:31
The Failures of America's Banking System 3:35
The Hoover Administration's Responses to the Great Depression 5:10
WWI's Global Economic Impact 5:40
Hoover and The Gold Standard 6:57
What Hoover did (and didn't) do about the Great Depression 8:13
The Reconstruction Finance Corporation 10:04
Impact of the Great Depression 10:30
Mystery Document 11:27
Accounts of the Great Depression 12:35
Credits 13:55

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The American Civil War is one of the deadliest in US History, and let's just get this out of the way: it was about slavery. In the more than 150 years since the end of the Civil War, there have been many attempts to litigate the reasons for the war, but the reality is that the root of the division was slavery. As such, Black Americans experience in that war is particularly interesting. Today, we'll learn about how Black people fought and participated in the war, the Emancipation Proclamation, and lots more.

Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935

Watch our videos and review your learning with the Crash Course App!
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Sources and References

-Deborah Gray White, Mia Bay, and Waldo E. Martin, Freedom on My Mind : A History of African Americans, with Documents Second edition. (Boston: Bedford/St. Martins, 2017)
-Kevin Levin, Searching for Black Confederates: The Civil War’s Most Persistent Myth (UNC Press, 2019).
-Ira Berlin et. al., Slaves No More: Three Essays on Emancipation and the Civil War (Cambridge University Press, 1992).


Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Shannon McCone, Amelia Ryczek, Ken Davidian, Brian Zachariah, Stephen Akuffo, Toni Miles, Oscar Pinto-Reyes, Erin Nicole, Steve Segreto, Michael M. Varughese, Kyle & Katherine Callahan, Laurel A Stevens, Vincent, Michael Wang, Jaime Willis, Krystle Young, Michael Dowling, Alexis B, Rene Duedam, Burt Humburg, Aziz, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, Alan Bridgeman, Rachel Creager, Jennifer Smith, Matt Curls, Tim Kwist, Jonathan Zbikowski, Jennifer Killen, Sarah & Nathan Catchings, Brandon Westmoreland, team dorsey, Trevin Beattie, Divonne Holmes à Court, Eric Koslow, Jennifer Dineen, Indika Siriwardena, Khaled El Shalakany, Jason Rostoker, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Andrei Krishkevich, ThatAmericanClare, Rizwan Kassim, Sam Ferguson, Alex Hackman, Eric Prestemon, Jirat, Katie Dean, TheDaemonCatJr, Wai Jack Sin, Ian Dundore, Matthew, Justin, Jessica Wode, Mark, Caleb Weeks
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#crashcourse #blackhistory #civilwar

There is no denying the effect that our environment has on us. Things like water and air pollution are detrimental to our health. In this episode of Crash Course Public Health, we’ll take a look at some of the ways our environment impacts us, why marginalized and low-income populations are disproportionately exposed to environmental pollution, and what we can do about it.

Check out our shared playlist with APHA: https://www.youtube.com/playli....st?list=PLDjqc55aK3k

Vanessa’s channel: https://www.youtube.com/braincraft

Sources: https://docs.google.com/docume....nt/d/1OHJiQ1njj5jWJC

Chapters:
Introduction: The Environment and Your Health 00:00
Defining our Environment 2:09
Air Pollution 3:43
Water Pollution 6:27
The Neighborhood Factor 8:11
Environmental Justice 11:59
Climate Change 12:11
Review & Credits 13:28

***
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Katie, Hilary Sturges, Austin Zielman, Tori Thomas, Justin Snyder, daniel blankstein, Hasan Jamal, DL Singfield, Amelia Ryczek, Ken Davidian, Stephen Akuffo, Toni Miles, Steve Segreto, Michael M. Varughese, Kyle & Katherine Callahan, Laurel Stevens, Michael Wang, Stacey Gillespie (Stacey J), Burt Humburg, Allyson Martin, Aziz Y, Shanta, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, Alan Bridgeman, Rachel Creager, Breanna Bosso, Matt Curls, Tim Kwist, Jonathan Zbikowski, Jennifer Killen, Sarah & Nathan Catchings, team dorsey, Trevin Beattie, Divonne Holmes à Court, Eric Koslow, Jennifer Dineen, Indika Siriwardena, Jason Rostoker, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, Les Aker, William McGraw, ClareG, Rizwan Kassim, Constance Urist, Alex Hackman, Jirat, Pineapples of Solidarity, Katie Dean, NileMatotle, Wai Jack Sin, Ian Dundore, Justin, Mark, Caleb Weeks
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