READ THIS: THERE ARE TWO MORE VIDEOS IN THE WORLD HISTORY SERIES. You should also turn on the captions. You'll like them.

In which John Green teaches you about the post-World War II breakup of most of the European empires. As you'll remember from previous installments of Crash Course, Europeans spent several centuries sailing around the world creating empires, despite the fact that most of the places they conquered were perfectly happy to carry on alone. After World War II, most of these empires collapsed. This is the story of those collapses. In most places, the end of empire was not orderly, and violence often ensued. While India was a (sort of) shining example of non-violent change, in places like The Congo, Egypt, Rwanda, Vietnam, Cambodia, and Laos, things didn't go smoothly at all. John brings you all this, plus pictures of Sea Monkeys. Sadly, they don't look anything like those awesome commercials in the comic books.

Resources:

The Columbia History of the 20th Century - http://dft.ba/-columbia20th

Crash Course World History is now available on DVD! http://store.dftba.com/product....s/crashcourse-world-

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Did you know that centrifugal force isn't really a thing? I mean, it's a thing, it's just not real. In fact, physicists call it a "Fictitious Force." Mind blown yet? To explore this idea further, this week Shini sits down with us to discuss centripetal force, centrifugal force, and a few other bits of physics to help us understand Uniform Circular motion.


***

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

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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:

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 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

The Milky Way is our neighborhood in the universe. It’s a galaxy and there are many others out there. Galaxies contain gas, dust, and billions of stars or more. They come in four main shapes: elliptical, spiral, peculiar, and irregular. Galaxies can collide, and grow in size by eating each other.


Crash Course Astronomy Poster: http://store.dftba.com/product....s/crashcourse-astron

--

Table of Contents
Milky Way is a Galaxy (One of Many) 2:04
Galaxies Have Four Main Shapes 3:18
Galaxies Can Collide 6:05

--

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--

PHOTOS/VIDEOS
NGC 5363 http://aftar.uaa.alaska.edu/gallery/details.cfm?img=316&type=# [credit: T.A. Rector (University of Alaska Anchorage) and H. Schweiker (WIYN and NOAO/AURA/NSF)]
Panorama of Spiral Galaxy, M31 http://www.noao.edu/image_gallery/html/im1259.html [credit: Local Group Survey Team and T.A. Rector (University of Alaska Anchorage)]
Animation of a variable star http://www.spacetelescope.org/videos/heic1323j/ [credit: NASA, ESA, M. Kornmesser]
Hubble M31 PHAT Mosaic http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA, ESA, J. Dalcanton, B.F. Williams, and L.C. Johnson (University of Washington), the PHAT team, and R. Gendler]
Elliptical - Death of giant galaxies spreads from the core https://www.spacetelescope.org/news/heic1508/ [credit: ESA/Hubble & NASA]
Spiral - HUBBLE VIEW OF BARRED SPIRAL GALAXY MESSIER 83 http://sci.esa.int/hubble/5359....0-hubble-view-of-bar [credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA). Acknowledgement: William Blair (Johns Hopkins University)]
Peculiar - Colliding galaxies make love, not war https://www.spacetelescope.org/news/heic0615/ [credit: NASA, ESA, and the Hubble Heritage Team STScI/AURA)-ESA/Hubble Collaboration]
Irregular - Little Galaxy Explored http://www.nasa.gov/mission_pa....ges/spitzer/multimed [credit: NASA/JPL-Caltech/STScI]
Hubble Image of Messier 101 http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA, ESA, K. Kuntz (JHU), F. Bresolin (University of Hawaii), J. Trauger (Jet Propulsion Lab), J. Mould (NOAO), Y.-H. Chu (University of Illinois, Urbana), and STScI]
A poster-size image of the beautiful barred spiral galaxy NGC 1300 http://www.spacetelescope.org/images/opo0501a/ [credit: NASA, ESA, and The Hubble Heritage Team STScI/AURA)]
NGC 3344 http://skycenter.arizona.edu/g....allery/Galaxies/NGC3 [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
Flocculent spiral NGC 2841 http://www.spacetelescope.org/news/heic1104/ [credit: NASA, ESA and the Hubble Heritage Team]
Barred Spiral Galaxy NGC1365 https://www.noao.edu/image_gal....lery/html/im1034.htm [credit: SSRO/PROMPT and NOAO/AURA/NSF]
Magnificent Details in a Dusty Spiral Galaxy http://hubblesite.org/newscent....er/archive/releases/ [credit: The Hubble Heritage Team]
Panning across Messier 77 http://www.spacetelescope.org/videos/heic1305b/ [credit: NASA, ESA, Digitized Sky Survey 2. Acknowledgement: A. van der Hoeven]
Hubble Mosaic of the Sombrero Galaxy http://www.spacetelescope.org/images/opo0328a/ [credit: NASA/ESA and The Hubble Heritage Team]
Spiral Galaxy NGC 4565 http://www.eso.org/public/images/eso0525a/ [credit: ESO]
M87 (with Jet) http://skycenter.arizona.edu/g....allery/Galaxies/M87% [credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona]
M59, NGC4621 https://www.noao.edu/image_gal....lery/html/im0579.htm [credit: NOAO/AURA/NSF]
Fulldome simulation of colliding galaxies http://www.spacetelescope.org/....videos/gal_coll_dome [credit: NASA/STScI]
Antennae Galaxies http://www.spacetelescope.org/images/potw1345a/ [credit: ESA/Hubble & NASA]
Terzan 5 Artist’s Concept http://www.sdss3.org/press/ima....ges/20111130.fourtai [credit: Amanda Smith, Institute of Astronomy, University of Cambridge]
Interacting Galaxy Pair Arp 87 http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA, ESA, and the Hubble Heritage Team]
Doing cartwheels to celebrate the end of an era http://www.spacetelescope.org/images/potw1036a/ [credit: ESA/Hubble & NASA]
Hoag's Object http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA and The Hubble Heritage Team]
Paranal Nights https://www.eso.org/public/images/potw1401a/ [credit: Y. Beletsky (LCO)/ESO]
Tarantula Nebula http://www.eso.org/public/images/eso1023a/ [credit: TRAPPIST/E. Jehin/ESO]
Hubble Ultra Deep Field 2014 http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA, ESA]

Today we are moving on from the existence of God to look at the philosophical debate surrounding the traditional divine attributes - omnipotence, omniscience, omnitemporality, and omnibenevolence. We are exploring the puzzles that these attributes create as well as some possible solutions to those puzzles, from Aquinas’ ideas of analogical predication, to the work of Eleanor Stump.

--

"The Avengers" copyright 2012 Marvel Studios
"Suicide Squad" copyright 2016 Warner Bros. Entertainment Inc.
All other images and via Wikimedia Commons licensed under Creative Commons by 4.0: https://creativecommons.org/licenses/by/4.0/

--

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

Crash Course Philosophy is sponsored by Squarespace.
http://www.squarespace.com/crashcourse

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In which John Green teaches you about Homer's Odyssey. If it was Homer's If Homer was even real. Anyway, that stuff doesn't really matter. John teaches you the classic, by which I mean classical, epic poem, the Odyssey. The Journey of Odysseus as he made his way home after the conclusion of the Trojan War is the stuff of legend. Literally. John will teach you about the double standard in Greek culture, Odysseus as jerk/hero, ancient PTSD, and cycles of violence. Also, there are no yogurt jokes. So think of that as a gift.

Our Subbable lead sponsor this week is Damian Shaw, who wants to thank Bryonie, Stew, Maureen, Peter & Morgan for their support.
Our Subbable co-sponsors are:
Max Loutzenheiser
Katy Cocco

So, if economics is about choices and how we use our resources, econ probably has a lot to say about the environment, right? Right! In simple terms, pollution is just a market failure. The market is producing more pollution than society wants. This week, Adriene and Jacob focus on the environment, and how economics can be used to control and reduce pollution and emissions. You'll learn about supply and demand, incentives, and how government intervention influences the environment.

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 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?

You can directly support Crash Course at https://www.patreon.com/crashcourse Subscribe for as little as $0 to keep up with everything we're doing. Free is nice, but if you can afford to pay a little every month, it really helps us to continue producing this content.

Citation 1: Steven J. Mithen - Sue Mithen, Thirst: Water and Power in the Ancient World. Harvard University Press. 2012. p 235
Citation 2: Patrice Bonnafoux, cited in Mithen. p243
Citation 3: Mithen. p 296

I'm sure you've heard of Isaac Newton and maybe of some of his laws. Like, that thing about "equal and opposite reactions" and such. But what do his laws mean? And how do they help us understand the world around us? In this episode of Crash Course Physics, Shini talks to us about just that.

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

Help PBSDS win a Webby Award by voting here: https://pv.webbyawards.com/201....6/online-film-video/

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In which John Green teaches you a little bit about drought, which is a natural weather phenomenon, and famine, which is almost always the result of human activity. Throughout human history, when food shortages strike humanity, there was food around. There was just a failure to connect those people with the food that would keep them alive. There are a lot of reasons that food distribution breaks down, and John is going to teach you about them in the context of the late-19th century famines that struck British India.

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Starting February 22nd, Carrie Anne Philbin will be hosting Crash Course Computer Science! In this series, we're going to trace the origins of our modern computers, take a closer look at the ideas that gave us our current hardware and software, discuss how and why our smart devices just keep getting smarter, and even look towards the future! Computers fill a crucial role in the function of our society, and it's our hope that over the course of this series you will gain a better understanding of how far computers have taken us and how far they may carry us into the future.

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

Want to know more about Carrie Anne?
https://about.me/carrieannephilbin

Want more Crash Course in person? We'll be at NerdCon: Nerdfighteria in Boston on February 25th and 26th! For more information, go to http://www.nerdconnerdfighteria.com/

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Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous, so a lot of interactions are actually about side-stepping direct competition and instead finding ways to divvy up resources to let species get along. Feel the love?

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Table of Contents
1) Competitive Exclusion Principle 2:02
2) Fundamental vs. Realized Niche 3:48
3) Eco-lography / Resource Partitioning 5:25
4) Character Displacement 7:29
5) Mutualism 9:15
6) Commensalism 9:55

References for this episode can be found in the Google document here: http://dft.ba/-2YuA

crashcourse, ecology, biology, competition, evolution, survival, habitat, species, interaction, communities, community ecology, resource, animal, limiting factors, competitive exclusion principle, success, paramecium, competitive advantage, extinction, food, prey, diversity, life, adaptation, niche, security, stability, fundamental niche, realized niche, conflict, nature, natural order, robert macarthur, warbler, ecologist, yale, resource partitioning, observation, zone, hunting, foraging, coexist, organism, selection, character displacement, peter grant, rosemary grant, galapagos finches, trait, mutualism, commensalism, mycorrhizae, termite, obligate mutualism, barnacle Support CrashCourse on Subbable: http://subbable.com/crashcourse

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.

Crash Course World History is now available on DVD! http://store.dftba.com/product....s/crashcourse-world-

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Today we're going to start our two-part unit on data visualization. Up to this point we've discussed raw data - which are just numbers - but usually it's much more useful to represent this information with charts and graphs. There are two types of data we encounter, categorical and quantitative data, and they likewise require different types of visualizations. Today we'll focus on bar charts, pie charts, pictographs, and histograms and show you what they can and cannot tell us about their underlying data as well as some of the ways they can be misused to misinform.

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Mark Brouwer, Nickie Miskell Jr., Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, Robert Kunz, SR Foxley, Sam Ferguson, Yasenia Cruz, Daniel Baulig, Eric Koslow, Caleb Weeks, Tim Curwick, Evren Türkmenoğlu, Alexander Tamas, Justin Zingsheim, 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 American women in the Progressive Era and, well, the progress they made. So the big deal is, of course, the right to vote women gained when the 19th amendment was passed and ratified. But women made a lot of other gains in the 30 years between 1890 and 1920. More women joined the workforce, they acquired lots of other legal rights related to property, and they also became key consumers in the industrial economy. Women also continued to play a vital role in reform movements. Sadly, they got Prohibition enacted in the US, but they did a lot of good stuff, too. The field of social work emerged as women like Jane Addams created settlement houses to assist immigrants in their integration into the United States. Women also began to work to make birth control widely available. You'll learn about famous reformers and activists like Alice Paul, Margaret Sanger, and Emma Goldman, among others.

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. Suffragists faced a decades-long debate on women’s right to vote: https://www.commonlit.org/text....s/address-to-congres
While it was a hard fight to get the vote, women eventually received suffrage in 1920: https://www.commonlit.org/text....s/was-hard-fight-to-

***SUBBABLE MESSAGE***
Thank you Edwin for being my best friend. Love, Dee

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Today we’re looking at silicon, and how introducing small amounts of other elements allow silicon layers to conduct currents, turning them into semiconductors. We’ll explore how putting two different types – N and P semiconductors – together gives us electrical components like diodes, transistors, and solar cells.

Crash Course Engineering is produced in association with PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO

Check out Reactions: https://www.youtube.com/channe....l/UCdJ9oJ2GUF8Vmb-G6

***

RESOURCES:
https://www.nobelprize.org/nob....el_prizes/physics/la
https://www.nobelprize.org/nob....el_prizes/physics/la
https://www.explainthatstuff.c....om/howtransistorswor
https://www.acs.org/content/ac....s/en/education/resou
http://butane.chem.uiuc.edu/ps....hapley/Environmental

***

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This week on Crash Course Mythology, we're getting urban. Mike Rugnetta is the man with the orange umbrella who's about to give you a free tour of mythical cities. We'll talk about a few cities that didn't exist, but we're going to focus on real cities with mythical founding stories. We'll talk about Jericho, Jerusalem, and Rome, among others.

Crash Course is made with Adobe Creative Cloud. Get a free trial here: http://www.adobe.com/creativecloud.html

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Mark Brouwer, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, Robert Kunz, SR Foxley, Sam Ferguson, Yasenia Cruz, Daniel Baulig, Eric Koslow, Caleb Weeks, Tim Curwick, Jessica Wode, Cami Wilson, Eric Prestemon, Evren Türkmenoğlu, Alexander Tamas, Justin Zingsheim, D.A. Noe, Shawn Arnold, Tom Trval, mark austin, Ruth Perez, Malcolm Callis, Kathrin Janßen, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, Nathan Taylor, 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, Jason A Saslow, Steve Marshall
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Today we’ll continue to explore sociology’s founding theorists with a look at Karl Marx and his idea of historical materialism. We’ll discuss modes of production, their development, and how they fit into Marx’s overall theory of historical development, along with class struggle and revolution. We’ll also discuss how Marx’s ideas gave rise to Gramsci’s idea of hegemony, and to conflict theories more generally.

Crash Course is made with Adobe Creative Cloud. Get a free trial here: https://www.adobe.com/creativecloud.html



***

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Today we’re talking about how we actually DO sociology. Nicole explains the research method: form a question and a hypothesis, collect data, and analyze that data to contribute to our theories about society.

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***

The Dress via Wired: https://www.wired.com/2015/02/....science-one-agrees-c
Original: http://swiked.tumblr.com/post/....112073818575/guys-pl

***

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Mark, Les Aker, Robert Kunz, William McGraw, Jeffrey Thompson, Jason A Saslow, Rizwan Kassim, Eric Prestemon, Malcolm Callis, Steve Marshall, Advait Shinde, Rachel Bright, Kyle Anderson, Ian Dundore, Tim Curwick, Ken Penttinen, Caleb Weeks, Kathrin Janßen, Nathan Taylor, Yana Leonor, Andrei Krishkevich, Brian Thomas Gossett, Chris Peters, Kathy & Tim Philip, Mayumi Maeda, Eric Kitchen, SR Foxley, Justin Zingsheim, Andrea Bareis, Moritz Schmidt, Bader AlGhamdi, Jessica Wode, Daniel Baulig, Jirat

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This week, John i s talking about one of his least favorite novels, The Lord of the Flies by William Golding. Lord of the Flies is a novel of ideas, and John doesn't agree with the central idea of the novel, which diminished his enjoyment of the book. The central idea of the book is that everyone has evil in their hearts. Which we don't necessarily agree with. That said, it's a good read, and worth reading.

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