What is Plate Tectonics: Crash Course Geology #10

In which you are introduced to the life and accomplishments of Alexander the Great, his empire, his horse Bucephalus, the empires that came after him, and the idea of Greatness. Is greatness a question of accomplishment, of impact, or are people great because the rest of us decide they're great?Also discussed are Kim Kardashian and the Situation, gender bias in history, Catherine the Great's death (not via horse love), the ardent love other generals--from Pompey the Great to Napoleon--had for Alexander, and a bit of Persian history.Chapters:Introduction 00:00What Makes Historical Figures So 'Great?' 1:19The Life of Alexander the Great 2:01Death & Legacy of Alexander the Great 4:28The Legend of Alexander the Great 6:11An Open Letter to the Ladies 7:29What Makes Alexander So Great? 8:34Credits 10:29Crash 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

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

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

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

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