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CrashCourse episodes

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

    Hank gets down to the nitty-gritty about meiosis, the special type of cell division that is necessary for sexual reproduction in eukaryotic organisms.

    References:
    http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20101/Bio%20101%20Lectures/Meiosis/meiosis.htm
    https://www.genome.gov/Glossary/index.cfm?p=viewimage&id=33
    http://www.sumanasinc.com/webcontent/animations/content/meiosis.html
    http://sun.menloschool.org/~dspence/biology/mit_meiosis/chapt11_15.html

    Table of Contents
    1) Homologous Chromosome Pairs 2:10
    2) Primary Oocytes 3:30
    3) Primary Spermatocytes 3:30
    4) Meiosis 2:59
    5) Interphase I 4:04
    6) Prophase I 4:37
    a) Crossover 5:05
    b) Recombination 5:05
    7) Metaphase I 7:53
    8) Anaphase I 8:05
    9) Telophase I 8:19
    10) Prophase II 8:57
    11) Metaphase II 9:23
    12) Anaphase II 9:28
    13) Telophase II 9:32

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    17 min
  • Statistical Thinking in Science: Crash Course Scientific Thinking #2

    We’re all gonna die someday. But can statistics help us know when? In this episode of Crash Course Scientific Thinking, we’ll learn how to interpret the statistics we see in our daily lives. And we’ll explore why we need stats to make informed judgments, be more precise about what we don’t know, and get closer to what we can know.

    Introduction: When Will I Die? 00:00
    Basic Statistics 0:44
    Confidence Intervals 4:14
    Relative & Absolute Risk 5:32
    Correlation vs. Causation 7:22
    Review & Credits 9:45

    Sources: https://docs.google.com/document/d/1Kv2_mFsDxQURuFDxpflD45dy-pCxlqnM9iPSNYxigmQ/edit?tab=t.0#heading=h.vk5i2fgqyumq


    ***
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    Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
    Mitch Gresko, Roger Harms, Brandon Thomas, Ken Davidian, AThirstyPhilosopher ., Michael Maher, Johnathan Williams, Chelsea S, oranjeez, EllenBryn, Katrix , Evan Nelson, Shruti S, UwU, Leah H., Allison Wood, Thomas Sully, Jennifer Wiggins-Lyndall, Dalton Williams, Quinn Harden, Chuck Smith, Andrew Woods, Kevin Knupp, Rie Ohta, Jason Terpstra, NassauLinda, Martin G. Diller, Matthew Fredericksen, Gina Mancuso, Elizabeth LaBelle, DexcilaDou, Barbara Pettersen, SpaceRangerWes, Emily Beazley, David Fanska, Reed Spilmann, Pietro Gagliardi, Jason Rostoker, Toni Miles, Les Aker, Alex Hackman, Liz Wdow, Wai Jack Sin, team dorsey, Rizwan Kassim, Eric Koslow, John Lee, Triad Terrace, Duncan W Moore IV, Matt Curls, ClareG, Emily T, Kristina D Knight, Stephen McCandless, Barrett, Bernardo Garza, Katie Dean, Laurel Stevens, Ian Dundore, Thomas, Trevin Beattie, Steve Segreto, Joseph Ruf, Nathan Taylor, Constance Urist, Jason Buster, Stephen Akuffo, Sarah & Nathan Catchings, Kyle & Katherine Callahan, Perry Joyce, Ken Penttinen, Tanner Hedrick, Scott Harrison, Jennifer Killen, Breanna Bosso, Alan Bridgeman, Siobhán, Krystle Young, Indija-ka Siriwardena, Samantha, Evol Hong, Tandy Ratliff, Erminio Di Lodovico, Luke Sluder, Caleb Weeks
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    17 min
  • Islam, the Quran, and the Five Pillars: Crash Course World History #13

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

    Chapters:
    Introduction: Islam 00:00
    Origins of Islam 0:51
    The Quran 2:36
    The Five Pillars of Islam 3:24
    An Open Letter to the 72 Virgins 4:50
    Sharia Law 5:48
    Muhammad, Medina, and Mecca 6:27
    The First Caliph 7:41
    How did Islam spread? 9:26
    The Islamic Empire's Legacy 11:10
    Credits 12:18

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    19 min
  • Central Nervous System: Crash Course Anatomy and Physiology #11

    Today Hank talks about your central nervous system. In this episode, we'll explore how your brain develops and how important location is for each of your brain's many functions.

    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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    Chapters:
    Introduction: Broca's Aphasia 00:00
    Central Nervous System Structure & Function 1:48
    Brain Development: Neural Tube 3:27
    Brain Development: 3 Primary Vesicles 3:47
    Brain Development: 5 Secondary Vesicles 4:04
    Brain Development: Major Adult Brain Regions 4:18
    Brain Development: Cerebellum & Brain Stem 4:42
    Brain Development: Reptilian Brain 5:45
    Brain Development: Cerebral Hemispheres 6:35
    The Brain's Lobes 7:35
    Review 9:14
    Credits 9:48

    ***
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    ***

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    15 min
  • Animals and Shapeshifters: Crash Course Latin American Literature #10

    Fish and insects and dogs—oh my! In this episode of Crash Course Latin American Literature, we’ll explore how all things fuzzy, buzzy, and ferocious can help us understand our own human nature.

    Introduction: Latin American Animals 00:00
    António Vieira 0:46
    Alejo Carpentier 3:34
    Pilar Quintana 6:27
    Review & Credits 8:54

    Sources: https://docs.google.com/document/d/1eE7g4-k6PD7C6wNBzeJIO8GCDHpoJl8ldDjKyq_2yYg/edit?tab=t.0
    To learn more, check out these videos:
    https://www.youtube.com/watch?v=oyv-eJRRozs
    https://youtu.be/dCBDUDwaeCA?si=YKQw_pwoCFj1i5dr
    https://youtu.be/NjEGncridoQ?si=pG_wBy4SXv07WiBZ
    https://youtu.be/RzHbL0ByeLY?si=UB4lKEPd92WiOkOYJesuits:
    https://youtu.be/5A_o-nU5s2U?si=lQYJP7Z3qvsa6pne

    Check out our CC Latin America Extra Curricular Playlist here:
    https://www.youtube.com/playlist?list=PL8dPuuaLjXtPTzMxnHVWhrV8dUZM0qL34

    ***
    Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourse
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    Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
    Mitch Gresko, Roger Harms, Brandon Thomas, Ken Davidian, AThirstyPhilosopher ., Michael Maher, Johnathan Williams, Chelsea S, oranjeez, EllenBryn, Katrix , Evan Nelson, Shruti S, UwU, Leah H., Allison Wood, Thomas Sully, Jennifer Wiggins-Lyndall, Dalton Williams, Quinn Harden, Chuck Smith, Andrew Woods, Kevin Knupp, Rie Ohta, Jason Terpstra, NassauLinda, Martin G. Diller, Matthew Fredericksen, Gina Mancuso, Elizabeth LaBelle, DexcilaDou, Barbara Pettersen, SpaceRangerWes, Emily Beazley, David Fanska, Reed Spilmann, Pietro Gagliardi, Jason Rostoker, Toni Miles, Les Aker, Alex Hackman, Liz Wdow, Wai Jack Sin, team dorsey, Rizwan Kassim, Eric Koslow, John Lee, Triad Terrace, Duncan W Moore IV, Matt Curls, ClareG, Emily T, Kristina D Knight, Stephen McCandless, Barrett, Bernardo Garza, Katie Dean, Laurel Stevens, Ian Dundore, Thomas, Trevin Beattie, Steve Segreto, Joseph Ruf, Nathan Taylor, Constance Urist, Jason Buster, Stephen Akuffo, Sarah & Nathan Catchings, Kyle & Katherine Callahan, Perry Joyce, Ken Penttinen, Tanner Hedrick, Scott Harrison, Jennifer Killen, Breanna Bosso, Alan Bridgeman, Siobhán, Krystle Young, Indija-ka Siriwardena, Samantha, Evol Hong, Tandy Ratliff, Erminio Di Lodovico, Luke Sluder, Caleb Weeks
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    15 min
  • Mitosis: Splitting Up is Complicated - Crash Course Biology #12

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

    References:
    http://www.eurekalert.org/pub_releases/2012-02/wifb-amm020812.php
    http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20101/bio%20101%20lectures/mitosis/mitosis.htm
    http://www.genome.gov/Images/press_photos/highres/97-300.jpg
    http://www.nature.com/nrm/journal/v2/n1/fig_tab/nrm0101_072a_F1.html
    https://www.genome.gov/Glossary/index.cfm?p=viewimage&id=33
    http://www.sci.sdsu.edu/multimedia/mitosis/mitosis_gif2.html

    Table of Contents
    1. Mitosis 0:24
    2. Interphase 3:27
    a) Chromatin 3:37
    b) Centrosomes 3:52
    3) Prophase 4:14
    a) Chromosomes 4:18
    b) Chromatid 4:31
    c) Microtubules 5:07
    4) Metaphase 5:22
    a) Motor Proteins 5:36
    5) Biolography 6:13
    6) Anaphase 9:00
    7) Telophase 9:15
    8) Cleavage 9:25
    9) Cytokinesis 9:36

    This video contains the following sounds from Freesound.org:
    "Swishes.wav" by Pogotron
    "Opening Scotch Whisky.mp3" by Percy Duke

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    16 min
  • How has technology influenced literature?: Crash Course Latin American Literature #11

    Science and technology have existed in Latin America since well before Columbus arrived. But how have they impacted literature? In this episode of Crash Course Latin American Literature, we’ll trace technological developments from the calendars of the Maya to WWII’s weapons of mass destruction—and uncover the creative ways writers have responded to them.

    Introduction: A QR Poem 00:00
    STEM in Pre-Colonial Latin America 0:53
    "El Eclipse" 1:47
    Creacionismo & "Altazor" 2:31
    The Crack Movement 5:42
    "En Busca de Klingsor" 6:51
    Review & Credits 8:56

    Sources: https://docs.google.com/document/d/1eE7g4-k6PD7C6wNBzeJIO8GCDHpoJl8ldDjKyq_2yYg/edit?tab=t.0
    To learn more, check out these videos:
    https://youtu.be/NjEGncridoQ?si=2YRF1cm8oVVUzIdn
    https://youtu.be/dCBDUDwaeCA?si=LS1Whq_J_2MTZUPi
    https://youtu.be/_XPZQ0LAlR4?si=GXluosRg_bZ2eHLg https://youtu.be/Objoad6rG6U?si=Muz0EIFL42c9JGdV https://youtu.be/Q78COTwT7nE?si=XQwXmgVwWyhuBct1
    https://youtu.be/NgVSHXOz3jI?si=O4b5n0yPA-Hg83Ve
    https://youtu.be/w4q1fG1vh5I?si=Pl7LyUA7eaNQCcdm

    Check out our CC Latin America Extra Curricular Playlist here:
    https://www.youtube.com/playlist?list=PL8dPuuaLjXtPTzMxnHVWhrV8dUZM0qL34

    ***
    Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourse
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    Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
    Mitch Gresko, Roger Harms, Brandon Thomas, Ken Davidian, AThirstyPhilosopher ., Michael Maher, Johnathan Williams, Chelsea S, oranjeez, EllenBryn, Katrix , Evan Nelson, Shruti S, UwU, Leah H., Allison Wood, Thomas Sully, Jennifer Wiggins-Lyndall, Dalton Williams, Quinn Harden, Chuck Smith, Andrew Woods, Kevin Knupp, Rie Ohta, Jason Terpstra, NassauLinda, Martin G. Diller, Matthew Fredericksen, Gina Mancuso, Elizabeth LaBelle, DexcilaDou, Barbara Pettersen, SpaceRangerWes, Emily Beazley, David Fanska, Reed Spilmann, Pietro Gagliardi, Jason Rostoker, Toni Miles, Les Aker, Alex Hackman, Liz Wdow, Wai Jack Sin, team dorsey, Rizwan Kassim, Eric Koslow, John Lee, Triad Terrace, Duncan W Moore IV, Matt Curls, ClareG, Emily T, Kristina D Knight, Stephen McCandless, Barrett, Bernardo Garza, Katie Dean, Laurel Stevens, Ian Dundore, Thomas, Trevin Beattie, Steve Segreto, Joseph Ruf, Nathan Taylor, Constance Urist, Jason Buster, Stephen Akuffo, Sarah & Nathan Catchings, Kyle & Katherine Callahan, Perry Joyce, Ken Penttinen, Tanner Hedrick, Scott Harrison, Jennifer Killen, Breanna Bosso, Alan Bridgeman, Siobhán, Krystle Young, Indija-ka Siriwardena, Samantha, Evol Hong, Tandy Ratliff, Erminio Di Lodovico, Luke Sluder, Caleb Weeks
    __

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    15 min
  • Fall of The Roman Empire...in the 15th Century: Crash Course World History #12

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

    Chapters:
    Introduction: The Fall of Rome 00:00
    Why Did the Roman Empire Fall? Barbarians at the Gates 0:30
    Why Did the Roman Empire Fall? Barbarians Inside the Gates 2:07
    An Open Letter to Pants 4:10
    Constantine and the Eastern Roman (Byzantine) Empire 5:10
    Comparing the Eastern & Western Roman Empires 6:57
    Emperor Justinian 8:08
    The Orthodox and Catholic Churches Split 10:38
    Credits 12:06

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    18 min
  • How Does Science Really Work? The Myth of the Great Experiment: Crash Course Scientific Thinking #3

    Sometimes experiments radically change our understanding of the world. But there’s much more to them than singular scientists. In this episode of Crash Course Scientific Thinking, we’ll learn why Louis Pasteur wasn’t a lone genius, and why it’s very difficult to design a study that gets us closer to the truth.

    Introduction: A Lone Genius 00:00
    The Scientific Community 0:32
    Louis Pasteur & Germ Theory 1:20
    Pasteur's Next Experiments 3:55
    Observational Science 6:08
    Ethical Experimentation 7:57
    Review & Credits 9:34

    Sources: https://docs.google.com/document/d/1Kv2_mFsDxQURuFDxpflD45dy-pCxlqnM9iPSNYxigmQ/edit?tab=t.0#heading=h.vk5i2fgqyumq

    ***
    Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourse
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    Join our Crash Course email list to get the latest news and highlights: https://mailchi.mp/crashcourse/email
    Get our special Crash Course Educators newsletter: http://eepurl.com/iBgMhY

    Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
    Mitch Gresko, Roger Harms, Brandon Thomas, Ken Davidian, AThirstyPhilosopher ., Michael Maher, Johnathan Williams, Chelsea S, oranjeez, EllenBryn, Katrix , Evan Nelson, Shruti S, UwU, Leah H., Allison Wood, Thomas Sully, Jennifer Wiggins-Lyndall, Dalton Williams, Quinn Harden, Chuck Smith, Andrew Woods, Kevin Knupp, Rie Ohta, Jason Terpstra, NassauLinda, Martin G. Diller, Matthew Fredericksen, Gina Mancuso, Elizabeth LaBelle, DexcilaDou, Barbara Pettersen, SpaceRangerWes, Emily Beazley, David Fanska, Reed Spilmann, Pietro Gagliardi, Jason Rostoker, Toni Miles, Les Aker, Alex Hackman, Liz Wdow, Wai Jack Sin, team dorsey, Rizwan Kassim, Eric Koslow, John Lee, Triad Terrace, Duncan W Moore IV, Matt Curls, ClareG, Emily T, Kristina D Knight, Stephen McCandless, Barrett, Bernardo Garza, Katie Dean, Laurel Stevens, Ian Dundore, Thomas, Trevin Beattie, Steve Segreto, Joseph Ruf, Nathan Taylor, Constance Urist, Jason Buster, Stephen Akuffo, Sarah & Nathan Catchings, Kyle & Katherine Callahan, Perry Joyce, Ken Penttinen, Tanner Hedrick, Scott Harrison, Jennifer Killen, Breanna Bosso, Alan Bridgeman, Siobhán, Krystle Young, Indija-ka Siriwardena, Samantha, Evol Hong, Tandy Ratliff, Erminio Di Lodovico, Luke Sluder, Caleb Weeks
    __

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    17 min
  • Plessy v Ferguson and Segregation: Crash Course Black American History #21

    The United States Constitution is not a very detailed document. It lays out the basic structure of government, and the details are filled in with legislation and clarified and reinforced by court decisions. One of the most consequential Supreme Court decisions was the 1896 case of Plessy v Ferguson, which set the precedent that segregating people by race was acceptable. This meant that every public accommodation had the right to refuse to serve Black Americans and that even public institutions like schools could be segregated. While the decision did stipulate that the segregated accommodations be "separate but equal," the equal part of that equation was often left out.

    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!
    Download here for Apple Devices: https://apple.co/3d4eyZo
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    VIDEO SOURCES
    https://www.nytimes.com/2020/01/31/obituaries/homer-plessy-overlooked-black-history-month.html
    http://projects.leadr.msu.edu/makingmodernus/exhibits/show/plessy-v--ferguson-1896/louisiana-separate-car-act--18
    Re-Writing Race in Early American New Orleans, Nathalie Dessens - https://journals.openedition.org/miranda/2296
    James C. Cobb, “Segregating the New South: The Origins and Legacy of Plessy v. Ferguson,” 12 Georgia State University Law Review 1017 (2012).
    Keith Medley, We As Freeman: Plessy V. Ferguson. Gretna, La. : Pelican Pub. Co., 2012.

    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, Stacey Gillespie, 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, Jirat, Katie Dean, neil matatall, TheDaemonCatJr, Wai Jack Sin, Ian Dundore, Matthew, Justin, Jessica Wode, Mark, Caleb Weeks
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    #crashcourse #history #segregation

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    15 min

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