The Mystery Behind Earth’s Missing Rocks: Crash Course Geology #16

At the heart of outbreaks are people! People are the ones who get sick, transmit diseases, and change the way they live in response to outbreaks. In outbreak science, we can better understand the relationship between people and disease through the discipline of epidemiology. In this episode of Crash Course Outbreak Science, we’ll look at what epidemiology is and how it helps us track the spread of diseases, and even stop outbreaks.This episode of Crash Course Outbreak Science was produced by Complexly in partnership with Operation Outbreak and the Sabeti Lab at the Broad Institute of MIT and Harvard—with generous support from the Gordon and Betty Moore Foundation.Sources:https://www.who.int/healthinfo/global_burden_disease/GBD_report_2004update_part3.pdfhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2944950/https://www.cdc.gov/lyme/diagnosistesting/index.htmlhttps://www.pnas.org/content/118/17/e2018995118https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6349221/ ***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: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__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 we're going to take a closer look at ecosystems -- which are communities of living organisms in an area interacting with their environment -- and how this relationship between the amount of energy a place receives and the movement of nutrients is what makes the incredible diversity of life possible. We'll also take a look at the patterns we see in the main global biomes, show you why some biomes (like tropical rainforests) are so productive, and discuss an agricultural practice some farmers have employed to help preserve their local ecosystems. 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:Alexis B, Rene Duedam, Burt Humburg, Aziz, Nick, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, Alan Bridgeman, Jennifer Smith, Matt Curls, Tim Kwist, Jonathan Zbikowski, Jennifer Killen, Sarah & Nathan Catchings, Brandon Westmoreland, team dorsey, Trevin Beattie, Eric Koslow, Indika Siriwardena, Khaled El Shalakany, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Laura Damon, Andrei Krishkevich, Sam Ferguson, Eric Prestemon, Jirat, Brian Thomas Gossett, Wai Jack Sin, Ian Dundore, Jason A Saslow, Justin, Jessica Wode, Mark, Caleb Weeks__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 #Geography #Ecosystems Learn more about your ad choices. Visit megaphone.fm/adchoices

In 1688, in Pennsylvania, a group of four men created the Germantown Petition, which made the case that slavery was immoral and that it was inconsistent with Christian beliefs in general, and Quaker beliefs specifically. While the petition wasn't ultimately adopted by the Quaker hierarchy, examining the document and its authors' goals gives us a better insight into slavery in the colonies and some of the earliest organized attempts at abolition.Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935Sources and ReferencesIra Berlin, “Slavery, Freedom, and Philadelphia’s Struggle for Brotherly Love, 1685 to 1861” in Richard Newman and James Mueller, eds., Antislavery and Abolition Philadelphia: Emancipation and the Long Struggle for Racial Justice in the City of Brotherly Love (Baton Rouge: Louisiana State University Press, 2011).Ira Berlin, Many Thousands Gone: The First Two Centuries of Slavery in North America (Cambridge: Belknap Press of Harvard University Press, 1998).Robin Blackburn, The American Crucible: Slavery, Emancipation, and Human Rights (New York and London: Verso Books, 2015).Katherine Gerbner, “Antislavery in Print: The Germantown Protest, the ‘Exhortation,’ and the Seventeenth-Century Quaker Debate on Slavery,” Early American Studies, vol. 9, no.3 (Fall 2011): 552-75.—- Christian Slavery: Conversion and Race in the Protestant Atlantic World. Philadelphia: University of Pennsylvania Press, 2018. Richard Newman and James Mueller, eds, Antislavery and Abolition Philadelphia: Emancipation and the Long Struggle for Racial Justice in the City of Brotherly Love. Baton Rouge: Louisiana State University Press, 2011. 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:Vincent, Emilee Murphy, Michael Wang, Jordan willis, Krystle Young, Michael Dowling, Alexis B, Rene Duedam, Burt Humburg, Aziz, Nick, 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, Indika Siriwardena, Khaled El Shalakany, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, William McGraw, Andrei Krishkevich, Sam Ferguson, Eric Prestemon, Jirat, TheDaemonCatJr, Wai Jack Sin, Ian Dundore, Jason A Saslow, Justin, Jessica Wode, Mark, Caleb Weeks__Sources and References-Ira Berlin, “Slavery, Freedom, and Philadelphia’s Struggle for Brotherly Love, 1685 to 1861” in Richard Newman and James Mueller, eds., Antislavery and Abolition Philadelphia: Emancipation and the Long Struggle for Racial Justice in the City of Brotherly Love (Baton Rouge: Louisiana State University Press, 2011).-Ira Berlin, Many Thousands Gone: The First Two Centuries of Slavery in North America (Cambridge: Belknap Press of Harvard University Press, 1998).-Robin Blackburn, The American Crucible: Slavery, Emancipation, and Human Rights (New York and London: Verso Books, 2015).-Katherine Gerbner, “Antislavery in Print: The Germantown Protest, the ‘Exhortation,’ and the Seventeenth-Century Quaker Debate on Slavery,” Early American Studies, vol. 9, no.3 (Fall 2011): 552-75.—- Christian Slavery: Conversion and Race in the Protestant Atlantic World. Philadelphia: University of Pennsylvania Press, 2018. -Richard Newman and James Mueller, eds, Antislavery and Abolition Philadelphia: Emancipation and the Long Strugg Learn more about your ad choices. Visit megaphone.fm/adchoices

Today we're talking about the heart and heartthrobs -- both literal and those of the televised variety. Hank explains how your heart’s pacemaker cells use leaky membranes to generate their own action potentials, and how the resulting electricity travels through the cardiac conduction pathway from SA Node to Purkinje fibers, allowing your heart to contract. He's also going to make you better able to spot inaccuracies in medical dramas by explaining how defibrillators work to reset the rhythm of your heart.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: Cardiac Arrest 00:00Cardiac Muscle Tissue Structure 1:24Pacemaker Cells - The Brain of Your Heart 2:49The Intrinsic Cardiac Conduction System 3:56How Defbrilators Work 6:46Review 8:33Credits 9:07***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, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall***SUBBABLE MESSAGES***TO: BethFROM: JoeyI Love You Beth Ronie With All Of My Heart!--TO: The WORLDFROM: Future Is The FutureAwesome gender neutral vintage clothing: http://futureisthefuture.com***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:Matthew Feickert, Stephen DeCubellis, Ethi Raj, Paul Castillo, Katrina Castillo, @bdb_i_am, Laura South, Philip Oddie, Suné Horn, @joshlama--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

For 381 days in 1955 and 1956, the Black citizens of Montgomery, Alabama boycotted the city bus system. Black riders had been mistreated on public transit all over the country for decades, and the national coverage of the Montgomery Bus Boycott intensified the public conversation about Civil Rights. By the time the Supreme Court decided that discrimination on buses was a violation of the 14th amendment, boycott leaders like Rosa Parks and Martin Luther King Jr were household names and the Civil Rights movements were on the national stage.Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935Sources and ReferencesJo Ann Robinson, The Montgomery Bus Boycott and the Women Who Started It (Knoxville: University of Tennessee Press, 1987).Jeanne TheoHarris, The Rebellious Life of Mrs. Rosa Parks. (Beacon Press, 2015)Daina Ramey Berry and Kali Nicole Gross, A Black Women’s History of the United States (Boston: Beacon Press, 2020).Martin Luther King Jr., Stride Toward Freedom; the Montgomery Story. New York: Harper & Row, 1958.https://www.nps.gov/articles/montgomery-bus-boycott.htmWatch 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:Dave Freeman, Hasan Jamal, DL Singfield, Lisa Owen, Jeremy Mysliwiec, Amelia Ryczek, Ken Davidian, Stephen Akuffo, Toni Miles, Erin Switzer, Steve Segreto, Michael M. Varughese, Kyle & Katherine Callahan, Laurel Stevens, Vincent, Michael Wang, Stacey Gillespie (Stacey J), Alexis B, Burt Humburg, Aziz Y, Shanta, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, 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, Khaled El Shalakany, Jason Rostoker, Shawn Arnold, Siobhán, Ken Penttinen, Nathan Taylor, Les Aker, ClareG, Rizwan Kassim, Alex Hackman, Jirat, Katie Dean, Avi Yashchin, NileMatotle, Wai Jack Sin, Ian Dundore, Justin, Mark, Caleb Weeks__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