Feeling motivated? Even if you are, do you know why? The story of Aaron Ralston can tell us a lot about motivation. In this episode of Crash Course Psychology, Hank tells us Ralston's story, as well as 4 theories of motivation and some evolutionary perspectives on motivation.

Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!

--
Chapters:
Introduction: Motivation 00:00
What is Motivation? 1:08
Evolutionary Perspective: Instincts 1:29
Drive-Reduction Theory: Homeostasis & Incentives 2:37
Optimal Arousal 3:39
Maslow's Hierarchy of Needs 4:49
How Sex Motivates Us 5:29
How Hunger Motivates Us 6:32
Effects of Hunger & Starvation 7:59
How Social Belonging Motivates Us 9:33
Review & Credits 10:34
--
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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 time, we're the asteroid.

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate

Subscribe to It's Okay To Be Smart: http://bit.ly/iotbs_sub

Read "The Sixth Extinction by Elizabeth Kolbert: http://amzn.to/1xGKn0K

Rodolfo Dirzo et al. "Defaunation in the Anthropocene" http://bit.ly/1H7JQdw
Stuart Pimm et al. "Biodiversity of Species and Their Rates of Extinction" http://bit.ly/1A5UZJM

Get to know an endangered species: http://discover.iucnredlist.org/

Half of world's wildlife has died off in past 40 years: http://bit.ly/1BHl8jR

Have an idea for an episode or an amazing science question you want answered? Leave a comment below!

Produced for PBS Digital Studios

Joe Hanson - Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc
Kate Eads - Associate Producer
Katie Graham - Director of Photography
Andrew Matthews - Editing/Motion Graphics
Dalton Allen - Post-production intern
John Knudsen - Gaffer

Theme music:
"Ouroboros" by Kevin MacLeod

Stock images by Shutterstock

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Today we’re rounding out our planetary tour with ice giants Uranus and Neptune. Both have small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue. Uranus has a truly weird rotation and relatively dull weather, while Neptune has clouds and storms whipped by tremendous winds. Both have rings and moons, with Neptune’s Triton probably being a captured iceball that has active geology.

This episode was brought to you by Squarespace http://www.squarespace.com/crashcourse

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron

--
Chapters:
Introduction: Uranus 00:00
Uranus's Structure 1:35
Uranus's Atmosphere 2:53
Uranus's Weird Tilt 3:55
Uranus's Moons 5:12
Uranus's Rings 6:00
Neptune's Structure 6:35
Neptune's Atmosphere 7:02
Neptune's Magnetic Field & Rings 8:10
Triton: Neptune's Largest Moon 8:36
The Discovery of Neptune 9:52
Review 11:27
--

PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Follow Phil on Twitter: https://twitter.com/badastronomer

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--

PHOTOS/VIDEOS
Uranus http://en.wikipedia.org/wiki/V....oyager_2#/media/File [credit: NASA/JPL/Voyager mission]
Neptune https://www.nasa.gov/content/2....5-years-ago-voyager- [credit: NASA]
King George III http://en.wikipedia.org/wiki/G....eorge_III_of_the_Uni
Uranus from Earth picture by Phil Plait
Uranus, Earth size comparison http://en.wikipedia.org/wiki/F....ile:Uranus,_Earth_si [credit: NASA]
Uranus core, reconstructed from http://en.wikipedia.org/wiki/F....ile:Uranus-intern-en [credit: Wikimedia Commons]
Uranus http://www.spacetelescope.org/....static/archives/imag [credit: NASA, ESA, L. Sromovsky and P. Fry (University of Wisconsin), H. Hammel (Space Science Institute), and K. Rages (SETI Institute)]
Uranus storms http://www.keckobservatory.org..../images/made/images/ [credit: Imke de Pater (UC–Berkeley)/Keck Observatory]
Uranus and rings (tilt demonstration) http://en.wikipedia.org/wiki/U....ranus#/media/File:Ur [credit: Hubble Space Telescope - NASA Marshall Space Flight Center]
Uranus with rings and moons http://www.eso.org/public/images/eso0237a/ [credit: ESO]
Miranda http://en.wikipedia.org/wiki/M....oons_of_Uranus#/medi [credit: NASA]
Verona Rupes http://apod.nasa.gov/apod/ap110404.html [credit: NASA]
Neptune’s Interior https://solarsystem.nasa.gov/m....ultimedia/display.cf [credit: Lunar and Planetary Institute]
Neptune clouds http://en.wikipedia.org/wiki/F....ile:Neptune_clouds.j [credit: NASA]
Neptune’s Great Dark Spot http://en.wikipedia.org/wiki/N....eptune#/media/File:N [credit: NASA / Jet Propulsion Lab]
Neptune’s Rings http://www.rolfolsenastrophoto....graphy.com/Astrophot [credit: Rolf Wahl Olsen / NASA/JPL (Voyager 2, NASA Planetary Data System)]
Triton http://en.wikipedia.org/wiki/T....riton_(moon)#/media/ [credit: NASA / Jet Propulsion Lab / U.S. Geological Survey]
Triton flipped http://en.wikipedia.org/wiki/F....ile:PIA01538_Triton_ [credit: NASA/JPL]
Triton Nitrogen Geysers http://en.wikipedia.org/wiki/T....riton_(moon)#/media/ NASA]

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Your love life would be WILD
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Get a sneak peek of the Maker Box I'm curating for Quarterly: https://www.youtube.com/watch?v=vit_ozLnHmA
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Ever find yourself wishing for relationship advice and have no one to turn to? Looking for the secrets to a long and happy relationship but can’t find the answers? Maybe you just want to know how to tell that certain someone that you like them, but don’t know how to make the first move? Have no fear, Mother Nature is here! Other animals have millennia worth of mating experience, maybe they can teach us a thing or two?

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It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D.
Director: Joe Nicolosi
Writer: Sarah Keartes
Editor/animator/producer: Andrew Matthews
Producer: Stephanie Noone and Amanda Fox

Produced by PBS Digital Studios
Music via APM
Stock images from Shutterstock http://www.shutterstock.com

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

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Check out our whole series on ENERGY! http://bit.ly/1BnH5zu
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The world of energy is a confusing place. What's better, nuclear or solar? What's the difference between fluorescent bulbs and LEDs? What's the difference between energy and power? And what the heck is a kilowatt-hour?!

In this video, we give you a tour of the essential principles behind the energy machine that puts fuel in our tanks and brings electricity to our homes. To be a good energy citizen, you need to speak the language
LEARN MORE:
Special thanks to Sheril Kirshenbaum and the Webber Energy Group at the University of Texas at Austin for their help with this series. http://www.webberenergygroup.com/

Check out their awesome online course "Energy 101" to learn about energy and energy policy from A to Z! http://www.energy101.com/

And to find out what people think about energy, check out the UT Energy Poll: http://www.utenergypoll.com/


Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below!
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It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.DFollow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
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For more awesome science, check out: http://www.itsokaytobesmart.com
Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Director of Photography
John Knudsen - Gaffer

Theme music:
"Ouroboros" by Kevin MacLeod

Other music via APM

Stock images from Shutterstock, stock footage from Videoblocks

-----------------

Last week's video:
Does the Moon Orbit the Earth? https://www.youtube.com/watch?v=3cJ3AemeUFM

More videos:
Why Does February Have 28 Days? https://www.youtube.com/watch?v=AgKaHTh-_Gs
Why Vaccines Work https://www.youtube.com/watch?v=3aNhzLUL2ys
Why Are Some People Left-Handed? https://www.youtube.com/watch?v=NPvMUpcxPSA
Where Does the Smell of Rain Come From? https://www.youtube.com/watch?v=lGcE5x8s0B8

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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Otters are more than just cute, adorable little fuzzballs, they are one of the greatest conservation success stories of all time. Sea otters are a keystone species, meaning that an entire ecosystem depends on their presence. After they were nearly hunted to extinction for their dense fur, sea urchins (the otters' favorite food) nearly destroyed the Pacific kelp forests, a habitat that hundreds of species rely on for food and shelter.

Thanks to the hard work of conservation scientists at places like the Monterey Bay Aquarium, sea otter populations are on their way back. Here's the story of one orphaned sea otter pup's journey back to the wild

(Whale illustrations by Nobu Tamura/CC-BY-3.0)

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Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Camera
John Knudsen - Gaffer

Theme music: "Ouroboros" by Kevin MacLeod

Other music via APM
Stock images from Shutterstock, stock footage from Videoblocks (unless otherwise noted)

World War I was very hard on the Russian Empire. So hard, in fact, that it led to the end of the Russian Empire. As the global conflict ground on, Tsar Nicholas II faced increasing unrest at home. Today we'll learn about the Revolutions of 1917, the rise of Lenin, Trotsky, and the Bolsheviks, and the Reussian Civil War and the creation of the Soviet Union. 

Sources
-Engelstein, Laura. Russia in Flames: War, Revolution, and Civil War, 1914-1922. Oxford: Oxford University Press, 2018.
-Kivelson, Valerie A. and Ronald Grigor Suny. Russia’s Empires. New York: Oxford University Press, 2017.
-Sanborn, Joshua A. Imperial Apocalypse: The Great War and the Destruction of the Russian Empire. New York: Oxford University Press, 2014.
-Smith, Bonnie G. Europe in the Contemporary World since 1900. 2nd ed. London: Bloomsbury, 2020.

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#crashcourse #history #russianrevolution

In which John Green teaches you how to assess the sources of information you find on the internet. The growing suspicion of expertise is a growing problem on the internet, and it can be very difficult to figure out which sources are authoritative. In this episode John offers some strategies to help you identify credible sources and take into account a source's point of view.

Special thanks to our partners from MediaWise who helped create this series:
The Poynter Institute
The Stanford History Education Group (sheg.stanford.edu)

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MediaWise is supported by Google.

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Long division is not hard when you use this fast easy math method.
This long division trick will see you right!


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How Many Faces, Edges And Vertices Does A Triangular Prism Have?
Here we’ll look at how to work out the faces, edges and vertices of a triangular prism.
We’ll start by counting the faces, these are the flat surfaces that make the shape. A triangular prism has 5 faces altogether - 2 triangle faces, as well as 3 rectangular faces.
Next we’ll work out how many edges the triangular prism has, which are where two faces meet. It has 9 edges.
Next we’ll count the corners (the corners). A triangular prism has 6 vertices.

For the full playlist for the faces, edges and Vertices of a whole lot of 3D shapes go to https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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SIMPLIFICATION BASED ON FRACTION | Viral Maths By Navneet Tiwari #SBI #IBPS #RBI #ESIC
#SBI #IBPS #RBI #ESIC

Welcome to Adda247 - India's Best Government Exam Preparation Channel. Prepare for Bank Exams (RBI Assistant, LIC Assistant, IBPS PO Mains, IBPS Clerk Mains, SBI Clerk, RRB PO, RRB Clerk, RBI Office Attendant, RBI Grade B, LIC, FCI, SEBI, JAIIB), Railway Exams (RRB NTPC, Railway Group D), and SSC Exams (SSC CGL, SSC CHSL, MTS, & CPO).

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Ratios are said to be in proportion if they equal. This video looks at how to simply see if two ratios are in proportion - that is whether they are equivalent. We then look at how to easily find out how much of a quantity is required to keep something in proportion. To support free math on Patreon (thank you): https://www.patreon.com/tecmath

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If you want extra practice on adding positive and negative integers together, you have come to the right place. When adding both positive and negative integers, you will need to subtract (not add) the absolute value of those integers. Whichever integer has the largest absolute value is the sign the answer will be. Don’t forget to check out the bonus problem and leave me your answer in the comments!

Understanding basic math isn’t just about crunching numbers; it's about fine tuning problem-solving abilities, making informed decisions, and gaining deeper insight into the world around us. From everyday tasks to complex situations, math plays a pivotal role.

Just as important is cultivating critical thinking skills. Learning how to analyze and evaluate information is needed to arrive at well-informed conclusions. Discover why these skills are the cornerstone of innovation, creativity and rational decision-making.

Math isn’t just confined to the classroom but is essential in all aspects of life from personal finance and career success to daily decision-making and creative endeavors.

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This video is a virtual math worksheet for understanding the basics of the power of tens. There are 4 problems in this video that you can work through yourself and check your answers against mine.

In this video we cover:

A quick review of the powers of ten
Converting numbers from standard form to expanded form
Converting numbers in expanded form to standard form

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Improved math is a channel created to provide additional instruction on essential math concepts. I’m passionate about math and I know first-hand how important math concepts are in the real world.

Teachers, parents, guardians, homeschoolers, and students can use these videos to help reinforce math skills.

For more information on math topics or for free printable worksheets and answer sheets, you can also visit my website at improvedmath.com

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On this lesson, you will learn all about converting to scientific notation and calculating scientific notation!

What is scientific notation?
How do I write a number in scientific notation?
When should I use scientific notation?

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Expressions and Equations Work with radicals and integer exponents.

Perform operations with numbers expressed in scientific notation, including problems where both decimal and scientific notation are used. Use scientific notation and choose units of appropriate size for measurements of very large or very small quantities (e.g., use millimeters per year for seafloor spreading). Interpret scientific notation that has been generated by technology.

If you want to know how to add positive and negative integers together, you have come to the right place. When adding both positive and negative integers, you will need to subtract (not add) the absolute value of those integers. Whichever integer has the largest absolute value is the sign the answer will be. Don’t forget to check out the bonus problem and leave me your answer in the comments!

Understanding basic math isn’t just about crunching numbers; it's about fine tuning problem-solving abilities, making informed decisions, and gaining deeper insight into the world around us. From everyday tasks to complex situations, math plays a pivotal role.

Just as important is cultivating critical thinking skills. Learning how to analyze and evaluate information is needed to arrive at well-informed conclusions. Discover why these skills are the cornerstone of innovation, creativity and rational decision-making.

Math isn’t just confined to the classroom but is essential in all aspects of life from personal finance and career success to daily decision-making and creative endeavors.

Thank you so much for watching!

💡 Subscribe for more free YouTube tips: https://www.youtube.com/c/ImprovedMath

💡Share this video with a friend: https://youtu.be/shLLhKS8AHA

✅ Let's connect:

For email inquiries: improvedmath@gmail.com

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https://www.tiktok.com/@improvedmath1?

https://www.pinterest.com/improvedmath/

On this lesson, you will learn everything there is to know about parallel lines cut by transversals and angle relationships including supplementary angles, complementary angles, vertical angles, alternate interior angles, alternate exterior angles, and corresponding angles.

This lesson answers the question: How do I find a missing angle? What are supplementary angles? What are complementary angles? What are vertical angles? How can I find vertical angles? How do I find alternate interior angles? How do I find corresponding angles?

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