Principais vídeos
How does education work? Where does the money come from? Who pays for it? Is going to college a good investment? Adriene and Jacob are talking today about the economics of education. Most countries require that their citizens get some education, and most countries pay for basic education, but the quality of education can vary widely. And in the US, post-secondary education can come with a lot of costs.
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:
Mark, Eric Kitchen, Jessica Wode, Jeffrey Thompson, Steve Marshall, Moritz Schmidt, Robert Kunz, Tim Curwick, Jason A Saslow, SR Foxley, Elliot Beter, Jacob Ash, Christian, Jan Schmid, Jirat, Christy Huddleston, Daniel Baulig, Chris Peters, Anna-Ester Volozh, Ian Dundore, Caleb Weeks
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Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane.
"Concert" music used with permission from Chameleon Circuit.
This video uses sounds from Freesound.org
Table of Contents time codes:
1) Passive Transport - 1:17
2) Diffusion - 1:25
3) Osmosis - 2:12
4) Channel Proteins- 4:37
5) Active Transport - 4:58
6) ATP - 5:37
7) Transport Proteins - 6:19
8) Biolography - 6:37
9) Vesicular Transport - 9:02
10) Exocytosis - 9:21
11) Endocytosis - 9:50
12) Phagocytosis - 9:57
13) Pinocytosis - 10:29
14) Receptor-Mediated Endocytosis - 10:48
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Now that we’re done with the planets, asteroid belt, and comets, we’re heading to the outskirts of the solar system. Out past Neptune are vast reservoirs of icy bodies that can become comets if they get poked into the inner solar system. The Kuiper Belt is a donut shape aligned with the plane of the solar system; the scattered disk is more eccentric and is the source of short-period comets, and the Oort Cloud which surrounds the solar system out to great distances is the source of long-period comets. These bodies all probably formed closer to the Sun and got flung out to the solar system’s suburbs by gravitational interactions with the outer planets.
Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron
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Chapters:
Introduction: Where Do Comets Come From? 00:00
Kuiper Belt, Scattered Disk, and Oort Cloud 2:52
Long-Period Comets come from the Oort Cloud 4:03
Short-Period Comets come from the Scattered Disk 4:27
Pluto, Plutinos, and other Kuiper Belt Objects 4:47
Oort Cloud Objects 8:25
Review 10:38
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PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Follow Phil on Twitter: https://twitter.com/badastronomer
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PHOTOS/VIDEOS
HD Long Exposure Star Timelapse https://vimeo.com/34172172 [credit: Jeffrey Beach, Beachfront B-Roll]
Fine Structure in the Comet’s Jets http://blogs.esa.int/rosetta/2....015/01/16/fine-struc http://en.wikipedia.org/wiki/P....rotoplanetary_disk#m [credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA]
Artist's impression of a protoplanetary disk. [credit: ESO/L. Calçada - ESO]
Creating Gas Giants http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=1 [credit: NASA's Goddard Space Flight Center]
What is a Sungrazing Comet? http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=1 [credit: NASA's Goddard Space Flight Center]
Pluto/Neptune Orbit http://www2.jpl.nasa.gov/files..../images/browse/pluto [credit: NASA]
1992 QB1 http://solarsystem.nasa.gov/mu....ltimedia/gallery/199 [credit: ESO]
Eris http://apod.nasa.gov/apod/ap060918.html [credit: W. M. Keck Observatory]
Moons of Pluto http://en.wikipedia.org/wiki/K....erberos_(moon)#/medi [credit: NASA, ESA, and M. Showalter (SETI institute)]
New Horizons Approach http://pluto.jhuapl.edu/common..../content/animations/ [credit: JHUAPL]
Moon http://svs.gsfc.nasa.gov/vis/a....000000/a003800/a0038 [credit: NASA/Goddard Space Flight Center Scientific Visualization Studio]
Pluto http://solarsystem.nasa.gov/multimedia/display.cfm?Category=Planets&IM_ID=20073 [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Sedna’s Orbit http://commons.wikimedia.org/w....iki/File:Sedna-PIA05 [credit: NASA]
Artist’s Conception of Kuiper Belt http://en.wikipedia.org/wiki/F....ile:14-281-KuiperBel [credit: NASA, Wikimedia Commons]
Kuiper Belt World (video) http://planetquest.jpl.nasa.gov/video/41 [credit: NASA Kepler Mission/Dana Berry]
Pluto Discovery Plates http://azmemory.azlibrary.gov/....cdm/singleitem/colle [credit: Clyde Tombaugh, Lowell Observatory]
This week on Crash Course Econ, Jacob and Adriene are talking about failure. Specifically, we're talking about market failures. When markets don't provide a good or service efficiently, that's a market failure. When markets fail, often governments step in to provide those services. Stuff like public education or military protection are good examples of market failures. So, what are some of the ways governments address, market failures? Well, it's funny you should ask, as we also talk about that in this episode. We'll get into taxes and subsidies and externalities and a bunch of other important stuff this week on Crash Course Econ.
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Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Mark, Eric Kitchen, Jessica Wode, Jeffrey Thompson, Steve Marshall, Moritz Schmidt, Robert Kunz, Tim Curwick, Jason A Saslow, SR Foxley, Elliot Beter, Jacob Ash, Christian, Jan Schmid, Jirat, Christy Huddleston, Daniel Baulig, Chris Peters, Anna-Ester Volozh, Ian Dundore, Caleb Weeks
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Hank explains the extremely complex series of reactions whereby plants feed themselves on sunlight, carbon dioxide and water, and also create some by products we're pretty fond of as well.
This video uses sounds from Freesound.org.
Citations:
http://biology.about.com/od/pl....antbiology/a/aa05060
http://www.rsc.org/Education/T....eachers/Resources/cf
http://www.ncbi.nlm.nih.gov/books/NBK21598/
http://www.life.illinois.edu/g....ovindjee/paper/gov.h
http://scienceaid.co.uk/biolog....y/biochemistry/photo
http://www.biology-innovation.....co.uk/pages/plant-bi
http://chemistry.about.com/od/....lecturenotesl3/a/pho
http://www.bio.umass.edu/biolo....gy/conn.river/calvin
http://www.talkorigins.org/faq....s/thermo/probability
Table of Contents:
1) Water 1:16
2) Carbon Dioxide 1:32
3) Sunlight/Photons 1:43
4) Chloroplasts 1:57
5) Light Reaction/Light-Dependent 2:42
a. Photosystem II 3:33
b. Cytochrome Complex 5:54
c. ATP Synthase 6:16
d. Photosystem I 7:06
6) Dark Reactions/Light-Independent 7:55
a. Phase 1 - Carbon Fixation 8:50
b. Phase 2 - Reduction 11:31
c. Phase 3 - Regeneration 12:02
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In which John Green teaches you about Homer's Odyssey. If it was Homer's If Homer was even real. Anyway, that stuff doesn't really matter. John teaches you the classic, by which I mean classical, epic poem, the Odyssey. The Journey of Odysseus as he made his way home after the conclusion of the Trojan War is the stuff of legend. Literally. John will teach you about the double standard in Greek culture, Odysseus as jerk/hero, ancient PTSD, and cycles of violence. Also, there are no yogurt jokes. So think of that as a gift.
Consider supporting local bookstores by purchasing your books through our Bookshop affiliate link https://bookshop.org/shop/complexly or at your local bookseller.
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Escape was one of the many ways that enslaved people resisted their captivity in the system of American slavery. The Underground Railroad was not literally a railroad. It was a network of people, routes, and safe houses that helped people escape from slavery in the south to freedom in the north. Today we'll talk about the origins of the Underground Railroad, the systems that helped people escape, and the people who helped along the route.
Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935
SOURCES
https://www.newyorker.com/maga....zine/2016/08/22/the-
http://www.pbs.org/black-cultu....re/shows/list/underg
https://www.nationalgeographic.....org/encyclopedia/un
https://www.theatlantic.com/ma....gazine/archive/2015/
https://www.nps.gov/subjects/u....ndergroundrailroad/w
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#crashcourse #history #undergroundrailroad
Today, we're going to talk about how the Earth moves, but to do that, we're going to have to go way back to the early days of the galaxy! Processes that happened before the Earth even formed have led us to the geographic patterns and processes that create Earth's environments and support all living things. We'll talk about how the Earth rotates, the effects of it being slightly tilted, how events like sea ice melting impact how the Earth wobbles, and of course talk about how our elliptical orbit gives us seasons. So many of our life decisions are influenced by the motion of Earth. It guides where we decide to live, what food we eat, or even what weather we experience - which we'll talk about more next time.
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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:
Eric Prestemon, Mark, DAVID MORTON HUDSON, Perry Joyce, Isaac Liu, 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, Jirat, Brian Thomas Gossett, Ian Dundore, Jason A Saslow, Jessica Wode, Caleb Weeks
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#CrashCourse #Geography
In which John Green teaches you about various reform movements in the 19th century United States. From Utopian societies to the Second Great Awakening to the Abolition movement, American society was undergoing great changes in the first half of the 19th century. Attempts at idealized societies popped up (and universally failed) at Utopia, OH, New Harmony, IN, Modern Times, NY, and many other places around the country. These utopians had a problem with mainstream society, and their answer was to withdraw into their own little worlds. Others didn't like the society they saw and decided to try to change it. Relatively new Protestant denominations like the Methodists and Baptists reached out to "the unchurched" during the Second Great Awakening, and membership in evangelical sects of Christianity rose quickly. At the same time, Abolitionist societies were trying to free the slaves. Americans of the 19th century had looked at the world they were living in and decided to change it.
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.
Of all of the reform movements of the 1800s, few were as impactful as the movement to abolish slavery: https://www.commonlit.org/text....s/the-revolutionary-
Women were heavily involved in the abolitionist movement and firsthand stories like freed slave Harriet Ann Jacobs' Incidents in the Life of a Slave Girl were important to the cause: https://www.commonlit.org/text....s/what-slaves-are-ta
Learn more about the abolitionist movement in Crash Course Black American History:
Maria Stewart (#14): https://youtu.be/nsVnWD5PrIg
Frederick Douglass (#17): https://youtu.be/7QOTexnD-NE
Chapters:
Introduction: Religious & Moral Reform Movements of the 19th Century 00:00
Shaker Communities 0:33
Latter Day Saints 1:21
Brook Farm 1:46
Other Utopian Communities 2:50
The 2nd Great Awakening 3:21
The Oneida Community 3:44
Values of the 2nd Great Awakening 4:25
The Temperance Movement 5:59
Asylums 7:02
Common Schools 7:29
The Abolitionist Movement 8:13
Resistance to the Abolitionist Movement 10:02
Abolitionist Writers 10:45
Mystery Document 11:40
Frederick Douglass 13:06
Credits 14:14
In which John Green examines Romeo & Juliet by William Shakespeare. John delves into the world of Bill Shakespeare's famous star-crossed lovers and examines what the play is about, its structure, and the context in which it was written. Have you ever wanted to know what iambic pentameter is? Then you should watch this video. Have you ever pondered what kind of people actually went to see a Shakespeare play in 1598? Watch this video. Were you aware that wherefore means "why?" Whether you were or not, watch this video. In Shakespeare's time, entertainment choices ranged from taking in a play to watching a restrained bear try to fight off a pack of dogs. Today on YouTube, our entertainment choices are just as wide-ranging. So you can either choose to watch the modern equivalent of bear-baiting (another cinnamon challenge) or you can be edified and entertained by John and Crash Course. So wherefore are you reading this description instead of watching the video?
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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 00:00
What Makes Historical Figures So 'Great?' 1:19
The Life of Alexander the Great 2:01
Death & Legacy of Alexander the Great 4:28
The Legend of Alexander the Great 6:11
An Open Letter to the Ladies 7:29
What Makes Alexander So Great? 8:34
Credits 10:29
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In which John Green teaches you about the American Revolution. And the Revolutionary War. I know we've labored the point here, but they weren't the same thing. In any case, John will teach you about the major battles of the war, and discuss the strategies on both sides. Everyone is familiar with how this war played out for the Founding Fathers; they got to become the Founding Fathers. But what did the revolution mean to the common people in the United States? For white, property-owning males, it was pretty sweet. They gained rights that were a definite step up from being British Colonial citizens. For everyone else, the short-term gains were not clear. Women's rights were unaffected, and slaves remained in slavery. As for poor white folks, they remained poor and disenfranchised. The reality is it took a long time for this whole democracy thing to get underway, and the principles of life, liberty, and the pursuit of happiness weren't immediately available to all these newly minted Americans.
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 Declaration of Independence not only initiated America's Revolutionary War but also laid the groundwork for some core principles of the new country: https://www.commonlit.org/text....s/the-declaration-of
Many of the ideas in the Declaration of Independence came from political theorist John Locke's Political Society: https://www.commonlit.org/texts/political-society
Learn more about the American Revolution in these other Crash Course videos:
Tea, Taxes, and The American Revolution: Crash Course World History #28: https://www.youtube.com/watch?v=HlUiSBXQHCw
The American Revolution: Crash Course Black American History #8: https://youtu.be/y75yPx9WKHY
Chapters:
Introduction: The American Revolution 00:00
The Battles of the American War for Independence 1:15
Colonists and the American Revolutionary War 2:50
Slaves and the American Revolutionary War 3:41
Native Americans and the American Revolutionary War 4:32
Women and the American Revolutionary War 5:36
'Revolutionary' Ideas: Voting Rights 6:17
'Revolutionary' Ideas: Religious Freedom 6:47
How the American Revolution Affected the Economy 7:16
Mystery Document 7:44
Slavery and Hypocrisy in the American Colonies 8:54
American Ideals of Equality 11:13
Credits 12:12
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In which John Green teaches you about the Cold War as it unfolded in Asia. As John pointed out last week, the Cold War was occasionally hot, and a lot of that heat was generated in Asia. This is starting to sound weird with the hot/cold thing, so let's just say that the United States' struggle against communist expansion escalated to a full-blown, boots-on-the-ground war in Korea and Vietnam. In both of these cases, the United States sent soldiers to intervene in civil wars that it looked like communists might win. That's a bit of a simplification, but John will explain it all to you.
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. While The Vietnam War was happening very far away from home, it had a major impact on American soldiers and civilians: https://www.commonlit.org/text....s/introduction-to-th
Americans with televisions had the war broadcasted right into their living rooms, leading to an immense Vietnam War resistance effort: https://www.commonlit.org/text....s/resistance-to-the-
Want to learn more about the Cold War? Check out these other videos from Crash Course:
USA vs USSR Fight! The Cold War: Crash Course World History #39:
https://www.youtube.com/watch?v=y9HjvHZfCUI
The Cold War: Crash Course US History #37:
https://www.youtube.com/watch?v=9C72ISMF_D0
George HW Bush and the End of the Cold War: Crash Course US History #44:
https://www.youtube.com/watch?v=L-K19rVDxoM
The Cold War and Consumerism: Crash Course Computer Science #24:
https://www.youtube.com/watch?v=m8i38Yq1wX4
Post-War Rebuilding and the Cold War: Crash Course European History #41:
https://www.youtube.com/watch?v=-rkIqtV07HE
Chapters:
Introduction: The Cold War in Asia 00:00
The Korean War 0:28
Eisenhower's Election 3:05
Cost of the Korean War 3:20
Mystery Document 4:18
Ho Chi Minh 5:19
American Involvement in Vietnam 5:55
The Gulf of Tonkin Incident 7:02
Operation Rolling Thunder 8:13
Fighting in Vietnam 8:41
Public Opinion and the Vietnam War 9:38
Nixon's Plan to Leave Vietnam 10:34
Anti-War Sentiments 11:19
The End of the Vietnam War 11:52
Credits 13:09
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Imagine if the only videos on YouTube were people looking for love. That could have been the world we lived in! Before it had 1.9 billion users per day, YouTube started as a video-based dating service, complete with the truly excellent catchphrase: “Tune in, Hook Up.”
The reason they didn’t flop is because they were willing to listen and fundamentally change their business when their original idea didn’t meet the needs of their market. They were clever observers and nimble enough to pivot.
***
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:
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, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, David Noe, Shawn Arnold, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
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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.org
All attributed images are licensed under Creative Commons by Attribution 4.0https://creativecommons.org/licenses/...
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So, it turns out we have an easy time reading emotions in facial expressions, but emotions can straight up kill us! In this episode of Crash Course Psychology, Hank discusses stress, emotions, and their overall impact on our health.
Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!
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Chapters:
Introduction: How Emotions Work 00:00
Facial Expressions 1:24
Expressing Emotions 2:18
How Many Emotions Are There? 2:57
Two-Dimensional Model of Emotional Experience 3:29
Defining Stress 4:52
Chronic Stress & the Autonomic Nervous System 6:36
Stress & Heart Disease 7:43
Pessimism & Depression 8:30
Review & Credits 9:30
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Take the 2017 PBS Digital Studios Survey: http://surveymonkey.com/r/pbsds2017. Today we’re going to create memory! Using the basic logic gates we discussed in episode 3 we can build a circuit that stores a single bit of information, and then through some clever scaling (and of course many new levels of abstraction) we’ll show you how we can construct the modern random-access memory, or RAM, found in our computers today. RAM is the working memory of a computer. It holds the information that is being executed by the computer and as such is a crucial component for a computer to operate. Next week we’ll use this RAM, and the ALU we made last episode, to help us construct our CPU - the heart of a computer.
*CORRECTION*
In our 16x16 Latch Matrix graphic, we inadvertently left off the horizontal row access line above the top row of latches. As a result, the highlighted line for the row at address 12 should actually be one line higher.
Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
The Latest from PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO
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Today on Crash Course Anatomy & Physiology, Hank breaks down the parts and functions of one of your body's unsung heroes: your epithelial tissue.
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
Chapters:
Introduction 00:00
Proper Epithelium & Glandular Epithelium 1:38
We're All Just Tubes! 2:12
Cell Shapes: Squamous, Cuboidal, or Columnar 3:34
How Form Relates to Function 4:15
Layering: Simple or Stratified 5:26
Epithelial Cells: Apical & Basal Sides 7:06
Glandular Epithelial Tissue Forms Endocrine & Exocrine Glands 8:20
Review 9:16
Credits 9:54
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Chances are, when you hear the phrase "Special Effects," you may have images pop into your mind. The Hulk smashing a city, a lightsaber fight, or maybe an alien world. But effects can be much more subtle and have been around really since the beginning of filmmaking. In this episode of Crash Course Film Production, Lily Gladstone talks about the basics of special effects.
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In 2006, a movie took on authoritarianism and the violent aftershocks of the Spanish Civil War—all through the eyes of an innocent young girl and the fairy tale world she discovers in the woods. Pan's Labyrinth is both a beautifully crafted fairy tale, and harrowing R rated adventure film. In this episode of Crash Course Film Criticism, Michael Aranda talks us through Guillermo Del Toro's film, Pan's Labyrinth.
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Check out all 15 films we'll be talking about below!!!
Citizen Kane
Aliens
Where Are My Children?
Selma
In the Mood For Love
Do the Right Thing
Lost In Translation
Apocalypse Now
Pan's Labyrinth
The Limey
Three Colors: Blue
The Eagle Huntress
Moonlight
Beasts of No Nation
2001: A Space Odyssey
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Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list...
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