Office Hours: Water

Phil takes us for a closer (eye safe!) look at the two-octillion ton star that rules our solar system. We look at the sun's core, plasma, magnetic fields, sunspots, solar flares, coronal mass ejections, and what all of that means for our planet.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--Chapters: Introduction: Our Sun 00:00The Sun's Core 1:28Convection 3:12Photosphere 3:49The Corona & Solar Wind 4:19How long does it take for light to reach the Sun's surface? 5:04Plasma & The Sun's Magnetic Fields 6:01Sunspots & Faculae 7:09Solar Flares & Coronal Mass Ejections (CMEs) 8:20The Earth & Solar Eruptions 9:18Review 10:59--PBS Digital Studios: http://youtube.com/pbsdigitalstudiosFollow Phil on Twitter: https://twitter.com/badastronomerCrash 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 internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseInstagram - https://www.instagram.com/thecrashcourse/CC Kids: http://www.youtube.com/crashcoursekids--PHOTO/VIDEO CREDITSHubble extrasolar planet search field in Sagittarius: http://www.spacetelescope.org/images/heic0612d/ [credit: NASA, ESA, K. Sahu (STScI) and the SWEEPS science team]The Sun: http://www.nasa.gov/sites/default/files/images/499558main_hmi4096.jpg [credit: SDO/HMI]The Sun: http://d1jqu7g1y74ds1.cloudfront.net/wp-content/uploads/2011/02/SDO_4096_0171.jpg [credit: NASA/SDO/AIA]Earth: http://www.nasa.gov/content/goddard/earth-from-space-15-amazing-things-in-15-years/#.VMvNXmTF_Z0 [credit: NASA's Earth Observatory]Fusion in the Sun: http://commons.wikimedia.org/wiki/File:FusionintheSun.svg [credit: Borb]Empire State Building: http://de.wikipedia.org/wiki/Empire_State_Building#mediaviewer/File:Empire_State_Building_from_the_Top_of_the_Rock.jpgSun Structure: https://www.flickr.com/photos/11304375@N07/2819311727/Photospheric granulation: http://solarscience.msfc.nasa.gov/images/granules.jpgCorona: http://philhart.smugmug.com/Sun/Queensland-Solar-Eclipse/i-qjqMzzK [credit: Phil Hart]"Magnet0873" by Newton Henry Black - Newton Henry Black, Harvey N. Davis (1913) Practical Physics, The MacMillan Co., USA, p. 242, fig. 200. Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Magnet0873.png#mediaviewer/File:Magnet0873.pngStrange Days On The Sun: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11682 [credit: NASA's Goddard Space Flight Center Images courtesy of NASA/SDO]Under the Sunspots: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=20070 [credit: NASA/Goddard Space Flight Center Conceptual Image Lab]Raining Loops: http://svs.gsfc.nasa.gov/vis/a010000/a011100/a011168/Raining_Loops_Still_2.jpg [credit: NASA's Goddard Space Flight Center/SDO]Coronal Mass Ejection: https://www.youtube.com/watch?v=p_xYcMQe5KA [credit: NASA]Aurora: https://www.youtube.com/watch?v=X-BicSV9RAwSoloar Close-ups: http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=4061 [credit: NASA] Learn more about your ad choices. Visit megaphone.fm/adchoices

Alkenes are an important type of molecule in organic chemistry that we’re going to see a lot more of in this series. But before we can really get into the many cool reactions alkenes do, we need to go over some of the basics. In this episode of Crash Course Organic Chemistry, we’ll review and build on our knowledge of alkene nomenclature, revisit our friend the carbocation, and learn Markovnikov’s Rule: an important tool that will help us predict the products of addition reactions involving alkenes.Series Sources:Brown, W. H., Iverson, B. L., Ansyln, E. V., Foote, C., Organic Chemistry; 8th ed.; Cengage Learning, Boston, 2018.Bruice, P. Y., Organic Chemistry, 7th ed.; Pearson Education, Inc., United States, 2014.Clayden, J., Greeves, N., Warren., S., Organic Chemistry, 2nd ed.; Oxford University Press, New York, 2012.Jones Jr., M.; Fleming, S. A., Organic Chemistry, 5th ed.; W. W. Norton & Company, New York, 2014. Klein., D., Organic Chemistry; 1st ed.; John Wiley & Sons, United States, 2012.Louden M., Organic Chemistry; 5th ed.; Roberts and Company Publishers, Colorado, 2009.McMurry, J., Organic Chemistry, 9th ed.; Cengage Learning, Boston, 2016.Smith, J. G., Organic chemistry; 6th ed.; McGraw-Hill Education, New York, 2020.Wade., L. G., Organic Chemistry; 8th ed.; Pearson Education, Inc., United States, 2013.***Watch our videos and review your learning with the Crash Course App! Download here for Apple Devices: https://apple.co/3d4eyZoDownload here for Android Devices: https://bit.ly/2SrDulJCrash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourseThanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:Catherine Conroy, Patty Laqua, Leonora Rossé Muñoz, Stephen Saar, John Lee, Phil Simmons, Alexander Thomson, Mark & Susan Billian, Junrong Eric Zhu, Alan Bridgeman, Jennifer Smith, Matt Curls, Tim Kwist, Ron Lin, Jonathan Zbikowski. Jennifer Killen, Sarah & Nathan Catchings, Brandon Westmoreland, team dorsey, Trevin Beattie, Eric Prestemon, Sam Ferguson, Yasenia Cruz, Eric Koslow, Indika Siriwardena, Khaled El Shalakany, Shawn Arnold, Tom Trval, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Justin Zingsheim, Andrei Krishkevich, Jirat, Brian Thomas Gossett, SR Foxley, Ian Dundore, Jason A Saslow, Jessica Wode, Mark, Caleb Weeks, Sam Buck--Want to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourseCC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

Today Craig finishes up our series on U.S. Government and Politics by talking about both the least and most important aspect of government: foreign policy. Foreign policy is important because it has the potential to affect the largest number of people, but at the same time, it tends to play a minimal role in our perception of the government (unless we’re at war). Foreign policy addresses diplomacy, security, human rights, economics, and the environment at a global scale, and we’re going to talk about how our government has approached each of these policies in the past and which it tends to hold most important. As with all things political, the decisions made in fulfilling these policies can be pretty controversial, especially when considering that the President often has the last word in these issues. We hope this series has helped you better understand the way the U.S. government works and hopefully encouraged you to participate in the political process - here or wherever you may live. Thank you so much for watching! Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios Additional support is provided by Voqal: http://www.voqal.orgAll attributed images are licensed under Creative Commons by Attribution 4.0https://creativecommons.org/licenses/...Want to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashC...Twitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourseCC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

In the second half of our look at the endocrine system, Hank discusses chemical homeostasis and hormone cascades. Specifically, he looks at the hypothalamus-pituitary-thyroid axis, or HPT axis, and all the ways your body can suffer when that system, or your hormones in general, get out of whack. 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: Graves Disease & Hyperthyroidism 00:00Hormone Cascades 2:35Hypothalamus-Pituitary-Thyroid (HPT) Axis 3:25Thyroid Disorders & Autoimmune Dysfunction 6:37Review 8:21Credits 8:57***Crash Course is now on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourseThanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:Mark Brouwer, Jan Schmid, Steve Marshall, Anna-Ester Volozh, Sandra Aft, Brad Wardell, Christian Ludvigsen, Robert Kunz, Jason, A Saslow, Jacob Ash, Jeffrey Thompson, Jessica Simmons, James Craver, Simun Niclasen, SR Foxley, Roger C. Rocha, Nevin, Spoljaric, Eric Knight, Elliot Beter, Jessica Wode***SUBBABLE MESSAGES***TO: RachelFROM: AlexI Love You!--TO: Crash CourseFROM: James EarleI loved Subbable. I'll see you on Patreon.***SUPPORTER THANK YOU!***Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:Megan McChristy, Matthew Feickert, Tara D. Kane, Gage Ledbetter, Benjamin Perea, Chad Walter, Janel Christensen, Alura Embrey, Ken Johnson, Harland Wirth--Want to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourseCC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

Massive stars fuse heavier elements in their cores than lower-mass stars. This leads to the creation of heavier elements up to iron. Iron robs critical energy from the core, causing it to collapse. The shock wave, together with a huge swarm of neutrinos, blasts through the star’s outer layers, causing it to explode. The resulting supernova creates even more heavy elements, scattering them through space. Also, happily, we’re in no danger from a nearby supernova.Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster--Chapters:Introduction: High Mass Stars 00:00Core Fusion Creates Heavier Elements 0:51Other Stages of High Mass Stars 2:22Silicone & Iron Fusion 3:43Core Collapse 6:20Supernova Remnants 8:22Explosive Nucleosynthesis 9:50Review 11:04--PBS Digital Studios: http://youtube.com/pbsdigitalstudiosFollow Phil on Twitter: https://twitter.com/badastronomerWant to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Patreon: http://www.patreon.com/crashcourse--PHOTOS/VIDEOSBlowing Bubbles http://chandra.harvard.edu/resources/animations/pne.html [credit: NASA/CXC/April Jubett]The Sizes of Stars http://www.eso.org/public/images/eso1030c/ [credit: ESO/M. Kornmesser]Red giants https://commons.wikimedia.org/wiki/File:Redgiants.svg [credit: Wikimedia Commons]Alpha Orionis http://imgsrc.hubblesite.org/hu/db/images/hs-1996-04-a-print.jpg [credit: A. Dupree (CfA), NASA, ESA]Sun and VY Canis Majoris https://commons.wikimedia.org/wiki/File:Sun_and_VY_Canis_Majoris.svg [credit: Wikimedia Commons]Witch Head Nebula and Rigel http://www.deepskycolors.com/archive/2009/11/16/witch-Head-Nebula-and-Rigel.html [credit: Rogelio Bernal Andreo]Layers of a massive star https://en.wikipedia.org/wiki/User:FT2/scc#/media/File:Massive_star_cutaway_pre-collapse_(pinned,_8M%2B).png [credit: Wikimedia Commons]NASA's Swift Reveals New Phenomenon in a Neutron Star http://www.nasa.gov/mission_pages/swift/bursts/new-phenom.html#.VcvAYflVhBd [credit: NASA's Goddard Space Flight Center]What is a black hole? http://www.nasa.gov/audience/forstudents/k-4/stories/nasa-knows/what-is-a-black-hole-k4.html [credit: NASA/CXC/M.Weiss]The Death of Stars http://www.spacetelescope.org/videos/hubblecast52a/ [credit: ESA/Hubble]Giant Mosaic of the Crab Nebula http://www.nasa.gov/multimedia/imagegallery/image_feature_460.html [credit: NASA, ESA, J. Hester (Arizona State University)]Hubble and Chandra spot a celestial bauble http://www.spacetelescope.org/images/heic1018b/ [credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA), and NASA/CXC/SAO/J. Hughes]Vela Supernova Remnant http://www.glitteringlights.com/Images/Nebulae/i-pqWFzmt/O [credit: Marco Lorenzi]Spica [credit: Phil Plait]Cassiopeia A https://en.wikipedia.org/wiki/Cassiopeia_A#/media/File:Cassiopeia_A_Spitzer_Crop.jpg [credit: Oliver Krause (Steward Observatory) George H. Rieke (Steward Observatory) Stephan M. Birkmann (Max-Planck-Institut fur Astronomie) Emeric Le Floc'h (Steward Observatory) Karl D. Gordon (Steward Observatory) Eiichi Egami (Steward Observatory) John Bieging (Steward Observatory) John P. Hughes (Rutgers University) Erick Young (Steward Observatory) Joannah L. Hinz (Steward Observatory) Sascha P. Quanz (Max-Planck-Institut fur Astronomie) Dean C. Hines (Space Science Institute)]Sloshing Supernova http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11735 [credit: NASA's Goddard Space Flight Center Video and images courtesy of NASA/JPL-Caltech]Star Burst http://svs.gsfc.nasa.gov/cgi-bin/details.cgi?aid=11447 [credit: NASA's Goddard Space Flight Center Video courtesy of ESA/Hubble/L. Calcada] Learn more about your ad choices. Visit megaphone.fm/adchoices

There’s no place like Earth—and we’ve got the planet’s spectacular, one-of-a-kind geology to thank for it. In this episode of Crash Course Geology, we’ll explore how geology touches our lives, helps us solve mysteries about the planet’s past and its future, and puts our world life in perspective.Introduction: More Than Rocks 00:00What is Geology 0:40Fall Lines and Settlement Patterns 3:37Jobs of Geologists 5:58Review and Credits 7:59Sources: https://docs.google.com/document/d/1RpwM8ZQPFk_DkzMJjMdtRrNGrJSNJ7FbgmQybSZ2Cqo/edit?tab=t.0Check out our CC Geology Extracurricular Playlist here: https://www.youtube.com/playlist?list=PL8dPuuaLjXtOmqnkvEtNVOrm0eaIjFjJ7 ***Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourseOr support us directly: https://complexly.com/supportJoin our Crash Course email list to get the latest news and highlights: https://mailchi.mp/crashcourse/emailGet our special Crash Course Educators newsletter: http://eepurl.com/iBgMhYThanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:Mike Cumings, Jr., NassauLinda, Chuck Smith, DexcilaDou, Martin G. Diller, Johnathan Williams, Allison Wood, Katrix , Jason Terpstra, Evan Nelson, Jennifer Wiggins-Lyndall, SpaceRangerWes, Dalton Williams, Chelsea S, Matthew Fredericksen, Michael Maher, AThirstyPhilosopher ., Mitch Gresko, Gina Mancuso, Roger Harms, Shruti S, Quinn Harden, Reed Spilmann, Stephen Akuffo, Andrew Woods, Kevin Knupp, UwU, David Fanska, oranjeez, Brandon Thomas, Toni Miles, Elizabeth LaBelle, Emily Beazley, Leah H., Rie Ohta, Barbara Pettersen, Ken Davidian, Tanner Hedrick, Trevin Beattie, Eric Koslow, Les Aker, Samantha, Laurel Stevens, Pietro Gagliardi, Alan Bridgeman, Stephen McCandless, Alex Hackman, Steve Segreto, Liz Wdow, Constance Urist, Thomas, Katie Dean, ClareG, Indija-ka Siriwardena, Jennifer Killen, Kristina D Knight, Nathan Taylor, John Lee, Evol Hong, Kyle & Katherine Callahan, Emily T, Breanna Bosso, Bernardo Garza, Rizwan Kassim, Jason Buster, Wai Jack Sin, Scott Harrison, Triad Terrace, Ian Dundore, Sarah & Nathan Catchings, Ken Penttinen, Barrett, Krystle Young, Duncan W Moore IV, Matt Curls, Erminio Di Lodovico, Perry Joyce, Siobhán, team dorsey, Joseph Ruf, Jason Rostoker, Luke Sluder, Caleb Weeks, Tandy Ratliff__Want to find Crash Course elsewhere on the internet?Instagram - https://www.instagram.com/thecrashcourse/Facebook - http://www.facebook.com/YouTubeCrashCourseBluesky - https://bsky.app/profile/thecrashcourse.bsky.socialCC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

In which John Green teaches you about the early days of the Civil Rights movement. By way of providing context for this, John also talks a bit about wider America in the 1950s. The 1950s are a deeply nostalgic period for many Americans, but there is more than a little idealizing going on here. The 1950s were a time of economic expansion, new technologies, and a growing middle class. America was becoming a suburban nation thanks to cookie-cutter housing developments like the Levittowns. While the white working-class saw their wages and status improve, the proverbial rising tide wasn't lifting all proverbial ships. A lot of people were excluded from the prosperity of the 1950s. Segregation in housing and education made for some serious inequality for African Americans. As a result, the Civil Rights movement was born. John will talk about the early careers of Martin Luther King, Thurgood Marshall, Rosa Parks, and even Earl Warren. He'll teach you about Brown v Board of Education, the lesser-known Mendez vs Westminster, the Montgomery Bus Boycott, and all kinds of other stuff.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 Civil Rights Movement gained national attention with the murder of Emmett Till in 1955: https://www.commonlit.org/texts/emmett-tillThat same year, Rosa Parks refused to give up her seat on a Montgomery bus, beginning the Montgomery bus boycott: https://www.commonlit.org/texts/rosa-parks-and-the-montgomery-bus-boycottA young preacher named Martin Luther King Jr. gained national fame rallying support for the Montgomery bus boycott: https://www.commonlit.org/texts/martin-luther-king-jrThe end of segregation also began in the South with the Showdown in Little Rock in 1957: https://www.commonlit.org/texts/showdown-in-little-rockWant to learn more about the Civil Rights movement? Check out these videos from Crash Course Black American History: School Segregation and Brown v Board (#33): https://www.youtube.com/watch?v=NBlqcAEv4nkEmmett Till (#34): https://www.youtube.com/watch?v=4HljsKwpv3gThe Montgomery Bus Boycott (#35): https://www.youtube.com/watch?v=ylOpide9dusMartin Luther King, Jr (#36): https://www.youtube.com/watch?v=BmeUT7zH62E---Crash Course Black American History will be uploading new videos through 2022!---Chapters:Introduction: The 1950s 00:00The American Suburbs 2:01The "Era of Consensus" 3:05Segregation 4:10Desegregating Schools 5:18Mystery Document 6:50The Aftermath of Brown vs. Board of Education 7:50Rosa Parks & the Montgomery Bus Boycotts 8:29Martin Luther King, Jr. 9:32The Little Rock Nine 9:54The Emergence of the Civil Rights Movement 10:30Credits 11:25Crash 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 internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseInstagram - https://www.instagram.com/thecrashcourse/CC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

Follow along: https://colab.research.google.com/drive/1uYXTDeBbPeuJfM1teufZ9nUaiRIN9nHW Today we create a game and then build an AI to destroy it. Our game is called TrashBlaster, and it’s like Asteroids but with trash in the ocean, and instead of a spaceship John Green Bot is wielding a laser. We'll use machine learning techniques such as an evolutionary neural network alongside a carefully crafted fitness function to create an unstoppable AI. To install the game on your computer download our repo on Github: https://github.com/crash-course-ai/lab3-gamesCrash Course is produced in association with PBS Digital Studios: https://www.youtube.com/pbsdigitalstudiosCrash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourseThanks 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--Want to find Crash Course elsewhere on the internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseTumblr - http://thecrashcourse.tumblr.com Support Crash Course on Patreon: http://patreon.com/crashcourseCC Kids: http://www.youtube.com/crashcoursekids#CrashCourse #ArtificialIntelligence #MachineLearning Learn more about your ad choices. Visit megaphone.fm/adchoices

Hank answers some questions and responds to some concerns about his video on water. Watch that video here: http://www.youtube.com/watch?v=HVT3Y3_gHGgCrash 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 internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseInstagram - https://www.instagram.com/thecrashcourse/CC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices

Just what is the difference between sensing and perceiving? And how does vision actually work? And what does this have to do with a Corgi? In this episode of Crash Course Psychology, Hank takes us on a journey through the brain to better explain these and other concepts. Plus, you know, CORGI!Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych! --Chapters:Introduction: Face Blindness (Prosopagnosia) 00:00Sensation vs. Perception 0:54Sense Thresholds 1:43How Human Vision Works 4:23Visible Light Spectrum 5:00How the Human Eye Processes Light 6:01Rods & Cones 6:31Human Color Vision 6:56Visual Cortex 8:02Parallel Processing 9:30Review & Credits 9:52--Crash 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 internet?Facebook - http://www.facebook.com/YouTubeCrashCourseTwitter - http://www.twitter.com/TheCrashCourseInstagram - https://www.instagram.com/thecrashcourse/CC Kids: http://www.youtube.com/crashcoursekids Learn more about your ad choices. Visit megaphone.fm/adchoices