Dihydrogen monoxide (better known as water) is the key to nearly everything. It falls from the sky, makes up 60% of our bodies, and just about every chemical process related to life takes place with it or in it. Without it, none of the chemical reactions that keep us alive would happen - none of the reactions that sustain any life form on earth would happen - and the majority of inorganic chemical reactions that shape the surface of the earth would not happen either. Every one of us uses water for all kinds of chemistry every day - our body chemistry, our food chemistry, and our laundry chemistry all take place in water.

In today's Crash Course Chemistry, we use Hank's actual dirty laundry (ew) to learn about some of the properties of water that make it so special - its polarity and dielectric property; how electrolytes can be used to classify solutions; and we discover how to calculate a solution's molarity as well as how to dilute a solution using the dilution equation.

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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Table of Contents
Polarity 02:40
Dielectric Property 04:13
Electrolytes 04:29
Molarity 08:46
Dilution 10:56

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This week, Adriene and Jacob teach you about macroeconomics. This is the stuff of big picture economics, and the major movers in the economy. Like taxes and monetary policy and inflation and policy. We need this stuff, because if you don't have a big picture of the economy, crashes and panics are more likely. Of course, economics is extremely complex and unpredictable. Today we'll talk about GDP as a measure of a country's economic health, the basics of economic analysis, and even a little about full employment, unemployment

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, Jan Schmid, Simun Niclasen, Robert Kunz, Daniel Baulig, Jason A Saslow, Eric Kitchen, Christian, Beatrice Jin, Anna-Ester Volozh, Eric Knight, Elliot Beter, Jeffrey Thompson, Ian Dundore, Stephen Lawless, Today I Found Out, James Craver, Jessica Wode, Sandra Aft, Jacob Ash, SR Foxley, Christy Huddleston, Steve Marshall, Chris Peters

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How do companies make money? What are profits? Revenues? How are prices set? This week, Jacob and Adriene are talking business. Whether you're selling cars, pizza, or glow sticks, this video has pretty much all the information you need to run a business. Well, not really, but there's a lot of good stuff in here.

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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:

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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The Harlem Renaissance was one of the richest, most vibrant, and most culturally generative artistic periods in American history and the work that emerged from that period continues to shape the landscape of American arts and letters today. In this episode, we’re going to explore some of the writers, artists, and musicians who turned Harlem into a world-renowned hub of art and culture, and delve into the factors that brought them all together in the first place.

Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935

VIDEO SOURCES
https://americanart.si.edu/art....ist/richmond-barthe-
https://www.howardgreenberg.co....m/artists/james-van-
https://danforth.framingham.ed....u/wp-content/uploads
https://danforth.framingham.ed....u/exhibition/meta-fu
https://poets.org/poet/langston-hughes
https://sites.ed.gov/whhbcu/on....e-hundred-and-five-h
https://www.nypl.org/blog/2020..../10/05/arturo-schomb
https://www.naacp.org/naacp-hi....story-james-weldon-j
https://www.britannica.com/top....ic/Harlem-poem-by-Hu
https://www.poetryfoundation.o....rg/poems/46548/harle
https://www.biography.com/activist/walter-white
https://www.britannica.com/bio....graphy/Gwendolyn-Ben
https://www.britannica.com/bio....graphy/Zora-Neale-Hu
https://music.si.edu/story/jazz
https://www.pcs.org/archive/bl....og/item/under-the-in
https://wmich.edu/mus-gened/mu....s150/CB-Ellington.ht
https://www.rbsclibrary.com/langston-hughes.html
https://www.loc.gov/item/ihas.200038834/
https://www.britannica.com/biography/Eubie-Blake
https://www.poetryfoundation.o....rg/poets/countee-cul
https://www.poetryfoundation.o....rg/poets/claude-mcka
Angela Davis, Blues Legacies and Black Feminism: Gertrude ‘Ma’ Rainey, Bessie Smith, and Billie Holiday (New York: Pantheon Books, 1998).
Cheryl Wall, Women of the Harlem Renaissance (Bloomington: Indiana University Press, 1995).

Watch our videos and review your learning with the Crash Course App!
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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:
DL Singfield, Jeremy Mysliwiec, 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 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, 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 #blackhistory

This week on Crash Course Economics, we're talking about monetary policy. The reality of the world is that the United States (and most of the world's economies) are, to varying degrees, Keynesian. When things go wrong, economically, the central bank of the country intervenes to try aand get things back on track. In the United States, the Federal Reserve is the organization that steps in to use monetary policy to steer the economy. When the Fed, as it's called, does step in, there are a few different tacks it can take. The Fed can change interest rates, or it can change the money supply. This is pretty interesting stuff, and it's what we're getting into today.

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:

Fatima Iqbal, Penelope Flagg, Eugenia Karlson, Alex S, Jirat, Tim Curwick, Christy Huddleston, Eric Kitchen, Moritz Schmidt, Today I Found Out, Avi Yashchin, Chris Peters, Eric Knight, Jacob Ash, Simun Niclasen, Jan Schmid, Elliot Beter, Sandra Aft, SR Foxley, Ian Dundore, Daniel Baulig, Jason A Saslow, Robert Kunz, Jessica Wode, Steve Marshall, Anna-Ester Volozh, Christian, Caleb Weeks, Jeffrey Thompson, James Craver, and Markus Persson

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Hank does his best to convince us that chemistry is not torture, but is instead the amazing and beautiful science of stuff. Chemistry can tell us how three tiny particles - the proton, neutron, and electron - come together in trillions of combinations to form ... everything. In this inaugural episode of Crash Course Chemistry, we start out with one of the biggest ideas in chemistry ever - stuff is made from atoms. More specifically, we learn about the properties of the nucleus and why they are important to defining what an atom actually is.

This video is available in Spanish on our Crash Course en Español channel! Watch it here: https://youtu.be/G7wUMpsB5k8

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
Intro 00:00
Einstein & Atoms 02:05
Composition of Atoms 03:18
Atomic Number 04:20
Isotopes 08:04
Relative Atomic Mass 07:26
Mass Number 07:44

Watch the SciShow episodes on the Strong Nuclear Force here:
http://www.youtube.com/watch?v=Yv3EMq2Dgq8
http://www.youtube.com/watch?v=BNDOSMqGLlg

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In 1955, the Supreme Court ruled unanimously that public schools should be racially integrated, and overturned the separate but equal doctrine established in Plessy v Ferguson decades before. This was made possible by a concerted legal effort spearheaded by the NAACP. Beginning in the 1930s, the NAACP's legal defense fund (led by Thurgood Marshall at the time of the Brown Decision) pursued a strategy of bringing cases to court that would expand the civil rights of Black Americans. This multi-decade effort culminated in the Brown decision, with many other victories along the way.

Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935

VIDEO SOURCES

Rachel Devlin, A Girl Stands at the Door: The Generation of Young Women Who Desegregated America's Schools. New York: Basic Books, 2018.
Justin Driver, The Schoolhouse Gate: Public Education, the Supreme Court, and the Battle for the American Mind. New York: Pantheon Books, 2018.
Charles Ogletree, Jr. All Deliberate Speed: Reflections on the First Half-Century of Brown V. Board of Education. New York: W.W. Norton & Co., 2004.
James T. Patterson, Brown v. Board of Education: A Civil Rights Milestone and Its Troubled Legacy. Oxford: Oxford University Press, 2002.
https://www.britannica.com/bio....graphy/Thurgood-Mars
https://www.law.virginia.edu/s....tatic/uvalawyer/html
Klarman, Michael J. "How Brown Changed Race Relations: The Backlash Thesis." The Journal of American History 81, no. 1 (1994): 81-118. Accessed July 29, 2021. doi:10.2307/2080994.
https://www.npr.org/sections/t....hetwo-way/2018/03/26
https://www.nps.gov/people/oliver-brown.htm


Watch our videos and review your learning with the Crash Course App!
Download here for Apple Devices: https://apple.co/3d4eyZo
Download here for Android Devices: https://bit.ly/2SrDulJ

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:
Dave Freeman, Hasan Jamal, DL Singfield, Lisa Owen, Jeremy Mysliwiec, Shannon McCone, 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), Jaime Willis, Alexis B, Burt Humburg, Aziz Y, DAVID MORTON HUDSON, Perry Joyce, Scott Harrison, Mark & Susan Billian, Junrong Eric Zhu, Rachel Creager, 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, ThatAmericanClare, Rizwan Kassim, Sam Ferguson, Alex Hackman, Jirat, Katie Dean, Avi Yashchin, NileMatotle, Wai Jack Sin, Ian Dundore, Justin, Mark, Caleb Weeks
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So far in this series, we've covered a lot of war, disease, climate disaster, and some more war. Well, prepare yourself for something a little more positive. This week, we're talking about the Enlightenment. In this video, you'll learn about the ideas of Voltaire, Rousseau, Montesquieu, Kant, Smith, Hume, and a bunch of other people whose ideas have been so impactful, they still influence the way we think about the world today.

Sources

Hunt, Lynn et al. Making of the West: Peoples and Cultures. Boston: Bedford St. Martin’s, 2019.
Smith, Bonnie G. et al. World in the Making: A History. Vol. 2. New York: Oxford University Press, 2019.

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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Only a couple of decades after the end of the First World War--which was supposed to be the War that Ended All Wars--another, bigger, farther-flung, more destructive, and deadlier war began. Today, you'll learn about how the war in Europe progressed, from the Molotov-Ribbentrop pact and the invasion of Poland, to the Western and Eastern fronts, to VE Day and the atom bombs used in Japan.

Sources

-Hunt, Lynn et al. Making of the West: Peoples and Cultures. 6th ed. Boston: Bedford St. Martin’s, 2019.
-Kotkin, Stephen. Stalin: Waiting for Hitler, 1929-1941. New York: Penguin, 2017.
-Mazower, Mark. Hitler’s Empire: How the Nazis Ruled Europe. New York: Penguin, 2008.
-Overy, Richard. Russia’s War: A History of the Soviet Effort, 1941-1945. New York: Penguin, 1998.
-Smith, Bonnie G. Europe in the Contemporary World, 1900 to the Present, 2nd ed. London: Bloomsbury, 2020.
-Snyder, Timothy. Bloodlands: Hitler between Hitler and Stalin. New York: Basic Books, 2010.


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, William McGraw, Siobhan Sabino, Jason Saslow, Jennifer Killen, Jon & Jennifer Smith, David Noe, Jonathan Zbikowski, Shawn Arnold, Trevin Beattie, Matthew Curls, Rachel Bright, Khaled El Shalakany, Efrain R. Pedroza, Ian Dundore, Kenneth F Penttinen, Eric Koslow, Timothy J Kwist, Indika Siriwardena, Caleb Weeks, Haixiang N/A Liu, Nathan Taylor, Avi Yashchin, Andrei Krishkevich, Sam Ferguson, Brian Thomas Gossett, SR Foxley, Tom Trval, Justin Zingsheim, Brandon, Westmoreland, dorsey, Jessica Wode, Nathan Catchings, Yasenia Cruz, Jirat

--

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#crashcourse #europeanhistory #worldwarii

Children's Stories Read Aloud for Kids
by James Dean
Read by Let's Read Stories

New York Times bestselling author and artist James Dean brings readers in for a big school surprise in Pete the Cat and the Surprise Teacher.

When Pete goes to school, he finds out his teacher is out sick and the substitute teacher is . . . his mom! It’s up to Pete to teach the teacher what school is all about.

Pete the Cat and the Surprise Teacher is a My First I Can Read book, which means it’s perfect for shared reading with a child.

Click here to purchase Pete the Cat and the Surprise Teacher: https://www.amazon.com/Pete-Su....rprise-Teacher-First

Countdown to Kindergarten
by Alison McGhee
Illustrated by Harry Bliss
Read by Let's Read Stories

It's just ten days before kindergarten, and this little girl has heard all there is to know--from a first grader--about what it's going to be like. You can't bring your cat, you can't bring a stuffed animal, and the number one rule? You can't ask anyone for help. Ever. So what do you do when your shoes come untied, if you're the only one in the class who doesn't know how to tie them up again?
Told with gentle humor by Alison McGhee and brought to exuberant life by New Yorker cartoonist Harry Bliss, this lighthearted take on pre-kindergarten anxiety will bring a smile to the face of every child--and parent--having first-day jitters.

Click here to purchase Countdown to Kindergarten: https://www.amazon.com/Countdo....wn-Kindergarten-Alis

How to Raise a Mom - Mother's Day Stories Read Aloud for Kids
by Jean Reagan
Illustrated by Lee Wildish

Click here to purchase How to Raise a Mom: https://www.amazon.com/How-Rai....se-Mom-Jean-Reagan/d

Celebrate the bond between moms and children in a humorous book that invites the kids to do the hard work of raising their mom...if just for a day!

A New York Times Bestseller

This humorous new addition to the beloved HOW TO . . . books takes readers through a playful, busy day with Mom. Written in an instructional style, two siblings suggest the best ways to raise a happy, healthy mom—from waking her up in the morning to arranging play dates, to making sure she gets enough exercise, some quiet time, and plenty of veggies! Filled with charming role-reversal humor, creative ideas, and lots of love, How to Raise a Mom is the perfect gift for Mother’s Day—or any day!

Praise for the HOW TO . . . series:

“A silly take on role reversal.” –Kirkus Reviews (How to Babysit a Grandma)

“Laugh-out-loud funny. . .” –Kirkus Reviews (How to Raise a Mom)

“. . . laugh-out-loud scenes and funny hidden details.” –Kirkus Reviews (How to Babysit a Grandpa)

“Touches of humor in each of the digitally rendered illustrations.” –Kirkus Reviews (How to Surprise a Dad)


The fun doesn't stop! Check out more HOW TO... picture books:

How to Babysit a Grandma
How to Babysit a Grandpa
How to Catch a Santa
How to Get Your Teacher Ready
How to Raise a Mom
How to Surprise a Dad

Adding Fractions with different denominators can be done mentally both accurately and rapidly using this cool math trick. Become a genius in no time!

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These are fractions that mean the same amount, but different numbers. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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How to work out the area of a rectangle in square metres and square centimetres.

In this video we look at how to multiply any two digit number by eleven instantly - much faster than any calculator! Multiplication has never been so fast and easy with this Vedic Maths Trick! Fast Mental Math Tricks and times tables - you've got to love them!

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The least common multiple (aka the lowest common multiplier LCM) is easy to work out - just use this simple method. Is this the fastest way? Like many things in math that depends on the problem being solved!
This video lesson looks at solving the LCM for less complex numbers. To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU To donate to the tecmath channel: https://paypal.me/tecmath?locale.x=en_AU
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ome people may find these easy - others not - but it is essential if you want to easily mentally multiply bigger numbers that you first master this.

Please like and subscribe!

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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Follow the basics and it's easy to multiply matrices.
Start off easy with orders - rows and columns and from there you'll be adding, subtracting and multiplying matrices.


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Join us on this lesson where you will learn about Solving Systems of Linear Equations by Graphing and solving systems of equations by graphing by working through a practice problem.

This lesson answers the questions: How do I solve a system of equations graphically? How do I solve a system of equation algebraically? What is a linear system? How do I find a solution to a system of linear equations?

Be sure to join our mailing list at http://www.mashupmath.com