CrashCourse

Why do animals do what they do? It’s a huge question, and in this episode, we’ll learn how scientists break it down. We’ll talk about the proximate and ultimate studies they use to understand animal behavior, and some of what they’ve learned along the way — including how much decision-making other animals are really doing.

Introduction: Animal Behavior 00:00
Proximate Level 02:01
Ultimate Level 03:06
Innate Behaviors 04:30
Complex Behaviors 06:34
Review & Credits 09:35

This series was produced in collaboration with HHMI BioInteractive, committed to empowering educators and inspiring students with engaging, accessible, and quality classroom resources. Visit https://BioInteractive.org/CrashCourse for more information.

Are you an educator looking for what NGSS Standards are covered in this episode? Check out our Educator Standards Database for Biology here: https://www.thecrashcourse.com/biologystandards

Check out our Biology playlist here: https://www.youtube.com/playlist?list=PL8dPuuaLjXtPW_ofbxdHNciuLoTRLPMgB

Watch this series in Spanish on our Crash Course en Español channel here: https://www.youtube.com/playlist?list=PLkcbA0DkuFjWQZzjwF6w_gUrE_5_d3vd3

Sources: https://docs.google.com/document/d/1GLDtAXE6ekg4Chk2qN3TYbNt0pJbyaHqTqRd6QY8pd4/edit?usp=sharing

***
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:
Forrest Langseth, Emily Beazley, Neeloy Gomes, oranjeez, Rie Ohta, Jack Hart, UwU, Leah H., David Fanska, Andrew Woods, Stephen Akuffo, Ken Davidian, Toni Miles, AmyL, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Krystle Young, Burt Humburg, Perry Joyce, Scott Harrison, Alan Bridgeman, Mark & Susan Billian, Breanna Bosso, Matt Curls, Jennifer Killen, Jon Allen, Sarah & Nathan Catchings, Bernardo Garza, team dorsey, Trevin Beattie, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Barrett Nuzum, Nathan Taylor, Les Aker, William McGraw, Rizwan Kassim, Vaso , ClareG, Alex Hackman, Constance Urist, kelsey warren, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks
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Just like many great duos throughout history, Bulgaria and Germany have a fascinating (though uneven) relationship. In today’s episode, we’re going to take a closer look at the impact of politics on economies as we trace this history of Bulgaria and Germany following World War II, and examine the ways capitalism, and communism, impacted their economic strength today.

SOURCES

General
Getis, Bjelland, and Getis. Introduction to Geography, 15 ed. McGraw-Hill Education. 2017. ISBN: 978-1-259-57000-1

Gregory, Derek, Ron Johnston, Geraldine Pratt, Michael Watts, and Sarah Whatmore, eds. 2009. The Dictionary of Human Geography. 5th ed. Willey-Blackwell. ISBN: 978-1-4051-3288-6

For a free and open source option for Intro to Human Geography, see: https://humangeography.pressbooks.com/

For a free and open source option for World Regional Geography, see: https://worldgeography.pressbooks.com/front-matter/introduction/

Cracking the AP Human Geography Exam: 2020 edition. The Princeton Review.

Sofia and Bulgaria General History
https://en.wikipedia.org/wiki/Sofia
https://www.cia.gov/the-world-factbook/countries/bulgaria/

Germany
https://vividmaps.com/germany-is-still-divided-by-east-and-west/
https://www.britannica.com/place/Germany/The-East-German-system
https://www.arcgis.com/apps/Cascade/index.html?appid=a575ead674b84f15a72c6196dbbd777a
https://www.pewresearch.org/fact-tank/2019/11/06/east-germany-has-narrowed-economic-gap-with-west-germany-since-fall-of-communism-but-still-lags/
https://www.bmwi.de/Redaktion/EN/Publikationen/jahresbericht-zum-stand-der-deutschen-einheit-2018.pdf?__blob=publicationFile&v=3

Bulgaria Economy
https://etd.ohiolink.edu/apexprod/rws_olink/r/1501/10?clear=10&p10_accession_num=osu1141408829
https://www.cia.gov/the-world-factbook/countries/bulgaria/#economy
https://www.worldbank.org/en/country/bulgaria/overview#3
https://open.lib.umn.edu/worldgeography/chapter/2-4-eastern-europe/
https://www.imf.org/en/Publications/SPROLLS/world-economic-outlook-databases#sort=%40imfdate%20descending
https://www.imf.org/en/Countries/BGR
https://www.worldstopexports.com/bulgarias-top-15-import-partners/
https://oec.world/en/profile/bilateral-country/rou/partner/bgr
https://www.bbc.com/news/world-europe-17202996
http://news.bbc.co.uk/2/hi/europe/4001113.stm
http://news.bbc.co.uk/1/hi/world/europe/327199.stm

German Bulgaria relations
https://oec.world/en/profile/bilateral-country/deu/partner/bgr
https://www.trademap.org/Country_SelProductCountry_Map.aspx?nvpm=1%7c100%7c%7c%7c%7cTOTAL%7c%7c%7c2%7c1%7c1%7c1%7c1%7c1%7c2%7c1%7c1%7c3
https://en.wikipedia.org/wiki/Bulgaria%E2%80%93Germany_relations

Watch our videos and review your learning with the Crash Course App!
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Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Dave Freeman, Hasan Jamal, DL Singfield, Jeremy Mysliwiec, Shannon McCone, Amelia Ryczek, Ken Davidian, Stephen Akuffo, Toni Miles, Erin Switzer, Steve Segreto, Michael M. Varughese, Kyle & Katherine Callahan, Laurel A Stevens, Vincent, Michael Wang, Stacey Gillespie, Jaime Willis, Krystle Young, Michael Dowling, Alexis B, Burt Humburg, Aziz Y, 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, Les Aker, William McGraw, Andrei Krishkevic

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Grumpy Professor Hank admits to being wrong about how everything is chemicals. But he now wants you to listen as he blows your mind with a new sweeping statement: everything (yes, really everything this time) is energy. What?!

This week, Hank takes us on a quick tour of how thermodynamics is applied in chemistry using his toy trebuchet as an example because he is a proud nerd.

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
Download it here for Android Devices: https://bit.ly/2SrDulJ

--
Table of Contents
Everything Is Energy 0:00
Forms of Energy 1:07
Potential Energy 2:11
Chemical Energy 1:55
Energy Is Constant & Law of Thermodynamics 2:49
System & Surroundings 5:03
Energy Transfer 4:57
Work 3:25
Heat 4:05
Trebuchets 0:48

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In this episode of Crash Course Art History, we’ll hold a mirror to our bodies…in art, anyway. We’ll learn what portraits and self-portraits can tell us about the people they represent and about artists who’ve used bodies to critique their societies.

Introduction: We All Have Bodies 00:00
Portraits & Self-Portraits 00:56
European Art & the Nude Figure 04:10
"Becoming an Image" 07:18
"Olympia" 08:46
Review & Credits 11:54

Image Descriptions: https://docs.google.com/document/d/1ETiCxe4GrVzFii7dBhF42oHx1EUCCh5y12wbtUjsH8A/edit

Sources: https://docs.google.com/document/d/1GW2NKzhpMNMmRyAFJVhFJG9cSfUOMRL-QrcWuHcWcIA/edit?usp=sharing


***
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:
Forrest Langseth, Emily Beazley, Neeloy Gomes, oranjeez, Rie Ohta, Jack Hart, UwU, Leah H., David Fanska, Andrew Woods, Stephen Akuffo, Ken Davidian, Toni Miles, AmyL, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Krystle Young, Burt Humburg, Perry Joyce, Scott Harrison, Alan Bridgeman, Mark & Susan Billian, Breanna Bosso, Matt Curls, Jennifer Killen, Jon Allen, Sarah & Nathan Catchings, Bernardo Garza, team dorsey, Trevin Beattie, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Barrett Nuzum, Nathan Taylor, Les Aker, William McGraw, Rizwan Kassim, Vaso , ClareG, Alex Hackman, Constance Urist, kelsey warren, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks
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In which John Green teaches you about the Mexican-American War in the late 1840s and the expansion of the United States into the western end of North America. In this episode of Crash Course, US territory finally reaches from the Atlantic coast to the Pacific Ocean. After Oregon was secured from the UK and the southwest was ceded by Mexico, that is. Famous Americans abound in this episode, including James K Polk (Young Hickory, Napoleon of the Stump), Martin Van Buren, Zachary Taylor, and Winfield Scott. You'll also learn about the California Gold Rush of 1848, and California's admission as a state, which necessitated the Compromise of 1850. Once more slavery is a crucial issue. Something is going to have to be done about slavery, I think. Maybe it will come to a head next week. Support CrashCourse on Patreon: https://www.patreon.com/crashcourse

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. America’s Westward expansion was fueled by both Manifest Destiny and a desire to grow the nation and its resources — though at a cost: https://www.commonlit.org/texts/manifest-destiny

Chapters:
Introduction: Texas & California 00:00
Manifest Destiny 0:41
The Oregon Trail 1:21
Western Settlements 1:37
How Texas Became a State 2:02
Polk's Wars for Expansion 4:04
Critics of the Mexican-American War 4:51
The End of the Mexican-American War 5:32
The Know-Nothings 6:20
The California Gold Rush 7:26
Mystery Document 8:08
California & the Free Soil Party 9:21
California Statehood and the Compromise of 1850 10:25
The Problem with Manifest Destiny 11:40
Credits 12:14


Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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Biology connects all of life—all of YOUR life. In the final episode of Crash Course Biology, Dr. Sammy is taking your questions. No matter how big, small, or personal, biology is in them all! He’ll show us how biology can help us solve problems and understand everyday life.

Introduction: Biology and You 00:00
Stress Response 01:27
Ecological Niches 3:15
Water Solvency 4:34
Unity of Life 6:16
Biology as a Career 7:50
Evolution 9:13
Final Review & Credits 10:47


This series was produced in collaboration with HHMI BioInteractive, committed to empowering educators and inspiring students with engaging, accessible, and quality classroom resources. Visit https://BioInteractive.org/CrashCourse for more information.

Are you an educator looking for what NGSS Standards are covered in this episode? Check out our Educator Standards Database for Biology here: https://www.thecrashcourse.com/biologystandards

Check out our Biology playlist here: https://www.youtube.com/playlist?list=PL8dPuuaLjXtPW_ofbxdHNciuLoTRLPMgB

Watch this series in Spanish on our Crash Course en Español channel here: https://www.youtube.com/playlist?list=PLkcbA0DkuFjWQZzjwF6w_gUrE_5_d3vd3

Sources: https://docs.google.com/document/d/1GLDtAXE6ekg4Chk2qN3TYbNt0pJbyaHqTqRd6QY8pd4/edit?usp=sharing


***
Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourse
Or support us directly: https://complexly.com/support
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:
Forrest Langseth, Emily Beazley, Neeloy Gomes, oranjeez, Rie Ohta, Jack Hart, UwU, Leah H., David Fanska, Andrew Woods, Stephen Akuffo, Ken Davidian, Toni Miles, AmyL, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Krystle Young, Burt Humburg, Perry Joyce, Scott Harrison, Alan Bridgeman, Mark & Susan Billian, Breanna Bosso, Matt Curls, Jennifer Killen, Jon Allen, Sarah & Nathan Catchings, Bernardo Garza, team dorsey, Trevin Beattie, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Barrett Nuzum, Nathan Taylor, Les Aker, William McGraw, Rizwan Kassim, Vaso , ClareG, Alex Hackman, Constance Urist, kelsey warren, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks
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This week Craig Benzine talks about how the President gets things done. Filling the role of the Executive Branch is a pretty big job - much too big for just one person. It's so big that the President employs an entire federal bureaucracy! Today, we’re just going to focus on those closest to the President, like the Vice President, the Cabinet, and the Executive Office of the President. We’ll figure out which strategy is most useful in helping the President make things happen and we’ll discuss the controversy around the President’s gradual increase in power. Oh, and as many of you noticed - last episode eagle got off too easy. Let’s see if we can make it up to you.

Support is provided by Voqal: http://www.voqal.org

Chapters:
Introduction: Governing 00:00
Who makes up the Executive Branch? 0:36
Who makes up the Executive Office of the President? 1:36
Independent agencies & government corporations 2:35
How the President can use party leadership to govern 3:57
How the President can use the media to shift public opinion 5:00
How the President can use administrative strategy to govern 5:29
Why Presidents rely on administrative strategies 7:19
Credits 8:50

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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We have learned over the past few weeks that gases have real-life constraints on how they move here in the non-ideal world. As with most things in chemistry (and also in life), how a gas moves is more complex than it seems at first. In this episode, Hank describes what it means when we talk about the velocity of a gas - to understand gas velocity, we have to know what factors affect it, and how. Hank also teaches you about effusion, diffusion, and concentration gradients, before showing off a cool experiment that physically demonstrates the things you have just learned. Sound exciting enough for you? Let's get started.

*Special Thanks to Matt Young at the University of Montana (Geosciences Department, Environmental Biogeochemistry Lab) who helped with the chemical demonstrations.*

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
Download it here for Android Devices: https://bit.ly/2SrDulJ

Table of Contents
Net Velocity vs. Average Velocity 1:17
Effusion 4:47
Graham's Law 5:52
Diffusion 7:22
Concentration Gradients 7:08
Precipitation Reaction with Gases 8:21

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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In this episode, Katie Mack and John Green discuss the wonder keeping the stars apart... dark energy.

Head to https://policygenius.com/crashcourse to get your free life insurance quotes and see how much you could save.

This show is a production of Complexly. If you want to help keep Crash Course free for everyone, forever, you can join our community on Patreon at http://www.patreon.com/crashcourse

Chapters
0:00 - Introduction
1:25 - Reviewing our Timeline
6:05 - Reviewing Redshift & Introducing the Hubble Tension
19:14 - Cosmic Noon & Galactic Archaeology
32:30 - The Universe's Rate of Expansion
40:29 - Dark Energy & The Cosmological Constant
55:58 - Poetry in the Astrophysics Podcast
58:07 - Outro

***
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
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Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Emily Beazley, Brandon Thomas, Forrest Langseth, oranjeez, Rie Ohta, Jack Hart, UwU, Leah H., David Fanska, Andrew Woods, Ken Davidian, Stephen Akuffo, Toni Miles, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Krystle Young, Burt Humburg, Scott Harrison, Mark & Susan Billian, Alan Bridgeman, Breanna Bosso, Matt Curls, Jennifer Killen, Jon Allen, Sarah & Nathan Catchings, team dorsey, Bernardo Garza, Trevin Beattie, Eric Koslow, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Nathan Taylor, Barrett Nuzum, Les Aker, William McGraw, ClareG, Rizwan Kassim, Constance Urist, Alex Hackman, kelsey warren, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks, Vaso
__

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In which Craig Benzine teaches you about the United States Congress, why it's bicameral, and what bicameral means. Craig tells you what the Senate and House of Representatives are for, talks about some of the histories of the institutions, and reveals to you just how you can become a representative. It's not that easy. But an eagle gets punched, so there's that.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Support is provided by Voqal: http://www.voqal.org

Chapters:
Introduction: What is Congress? 00:00
Who makes up the House of Representatives? 1:09
Who makes up the Senate? 1:38
What does Congress do? 1:58
Powers of the House of Representatives 2:13
Powers of the Senate 3:13
Why is Congress bicameral? 3:52
What's the difference between the Senate and the House? 6:00
Credits 8:32

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