https://www.patreon.com/homeschoolpop We share some interesting Valentine's Day Facts for kids in this Homeschool Pop video! How many valentines are sent out every year? How many boxes of chocolates are given on Valentine's Day? What is the story behind this interesting holiday? Learn these facts and more in this video!

00:00 Introduction
0:13 How many valentines are sent in a year?
0:52 Where is Valentine's Day celebrated?
0:14 Valentine's candy
1:44 The origins of Valentine's Day


❤️ Homeschool Pop? Join our team and get tattoos here: http://homeschoolpop.com

Thanks for learning with us today! We hope to see you next video!

Homeschool Pop Team

Neil deGrasse Tyson features his interview with Jane Goodall and discusses chimpanzee behavior with Chuck Nice and Jill Pruetz.

Jane Goodall 1934 - 2025

Startalk | S3, E3

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#NationalGeographic #Startalk #JaneGoodall

About National Geographic:
National Geographic is the world's premium destination for critically acclaimed storytelling around science and exploration. Discover amazing wildlife, ancient civilizations, hidden worlds, and the incredible wonders of our Earth. Through world-class scientists, photographers, journalists, and filmmakers, Nat Geo inspires fans of all ages to connect with, explore, and care about the world.

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Jane Goodall: Discussing Chimpanzee Behavior (Full Episode) | Startalk | National Geographic
https://youtu.be/Ztjcf7iR5DE

National Geographic
youtube.com/natgeo

Why do people sometimes do bad things just because someone else told them to? And what does the term Groupthink mean? In today's episode of Crash Course Psychology, Hank talks about the ideas of Social Influence and how it can affect our decisions to act or to not act.

Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!
--
Chapters:
Introduction 00:00
Milgram's Obedience Experiment 0:31
Social Influence & Conformity 3:22
Asch's Conformity Experiment 4:08
Cultural Expectations & Normative Social Influence 5:21
Social Facilitation 5:59
Social Loafing 6:19
Deindividuation & Group Polarization 6:51
Groupthink 7:58
Review & Credits 9:06

--
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This week Craig continues our conversation on presidential powers by looking at those NOT found in the Constitution - implied or inherent powers. We’ll talk about how the President uses their power to negotiate executive agreements, recommend legislative initiatives, instate executive orders, impound funds, and claim executive privilege in order to get things done. Implied powers are kind of tough to tack down, as they aren’t really powers until they’re asserted, but once they are, most subsequent Presidents chose not to give them up. So we’ll try to cover those we’ve seen so far and talk a little bit about reactions to these sometimes controversial actions from the other branches of Congress.

Support is provided by Voqal: http://www.voqal.org
This episode is sponsored by Squarespace: http://www.squarespace.com/crashcourse

Chapters:
Introduction: Informal Powers of the President 00:00
Informal powers of the President 0:50
Inherent power to use troops 1:20
War Powers Resolution 2:23
Executive agreements vs. treaties 2:42
CEO of the U.S. 3:31
Legislative Initiative 4:18
Executive orders 5:20
Impounding funds 6:02
Executive privilege 6:20
The importance of presidential precedent 6:56
Credits 7:21

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High-energy rechargeable batteries seemed impossible, until we made them. Sponsored by CodeRabbit. Cut code review time and bugs in half. Try CodeRabbit at https://coderabbit.link/veritasium

If you’re looking for a molecular modelling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV

▀▀▀
0:00 What’s inside a battery?
4:11 How does a battery work?
7:15 How did we increase battery power?
11:13 The first rechargeable lithium battery
13:29 The Tiny Needles That Kill Batteries
16:06 Goodenough? We can do better
20:07 The birth of the lithium-ion battery
27:10 Why do batteries explode?
29:31 Blowing up a battery

▀▀▀
A massive thank you to Dr Billy Wu, Dr Sam Cooper, Dr Derek Sui, Professor Magda Titirici, Dr Jingyu Feng, Dr Monica Marinescu, Li Ren Thow, Genlin Liu and Sam Riley; and to Professor Guillermo Rein, Dr Harry Mitchell, Hanna Berry, and Dr Nick Kalogeropoulos at Imperial College London for their invaluable contributions to this video. And a big thank you to Conrad Duncan for all his help in pulling everything together.

We’re incredibly grateful to Kurt Kelty and the team at General Motors for their time and expertise.

Thanks also go to Dr Yuzhang Li and Prof Jay Morton Turner for all their help on the project.

▀▀▀
References: https://ve42.co/RefsBatteries

Image References: https://ve42.co/ImgRefsBatt

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Special thanks to our Patreon supporters:

Adam Foreman, Albert Wenger, Alex Porter, Alexander Tamas, Anton Ragin, armedtoe, Balkrishna Heroor, Bertrand Serlet, Blake Byers, Bruce, Dave Kircher, David Johnston, David Tseng, Evgeny Skvortsov, Garrett Mueller, Gnare, gpoly, Ibby Hadeed, JT, Jeromy Johnson, Jon Jamison, Juan Benet, Keith England, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, meg noah, Michael Bush, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Robert Oliveira, Sam Lutfi, Tj Steyn, Ubiquity Ventures, Walter Flinn, wolfee

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Production Team: Rob Beasley Spence & Josh Pitt
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Additional video/photos supplied by Getty Images, Pond5
Music from Epidemic Sound

New research shows chameleons actively tune nano-crystals to change their color.
For a 10-day free trial, check out http://lynda.com/veritasium
Chameleon research in Nature Communications: http://bit.ly/1FacHO2
"Photonic Crystals Cause Active Colour Change in Chameleons"

This research was carried out by Jérémie Teyssier, Suzanne V. Saenko, Dirk van der Marel & Michel C. Milinkovitch at the University of Geneva Department of Quantum Matter Physics and the Laboratory of Artificial and Natural Evolution (LANE)

Original videos of chameleons are here:
https://www.youtube.com/watch?v=YIRiCwHlUd8
https://www.youtube.com/watch?v=XdQvtP8EKrM
https://www.youtube.com/watch?v=YSH7EmXFMac
https://www.youtube.com/watch?v=egwueh6wj1E

Additional details available at: http://www.lanevol.org/LANE/ch....ameleon_colour_chang
For correspondence: Michel C. Milinkovitch, Laboratory of Artificial & Natural Evolution (LANE), Dept. of Genetics & Evolution, University of Geneva, Switzerland.

The melanin spreading out video is courtesy of Richard Wheeler:
https://www.youtube.com/watch?v=hL0USeWjTHQ
http://www.richardwheeler.net

Special thanks to:
Harry, Jo, Daniella and Raquel for helping me produce and film this video - it looks great thanks to you!

In the penultimate episode of Crash Course Anatomy & Physiology, Hank explains your adaptive immune system. The adaptive immune system's humoral response guards extracellular terrain against pathogens. Hank also explains B cells, antibodies, and how vaccines work.

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: Adaptive Immune Responses 00:00
How B Cells Identify Antigens 2:14
B Cells Become Effector Cells & Memory Cells 4:05
How Antibodies Fight Antigens 5:22
Active and Passive Humoral Immunity 6:03
How Vaccines Work 6:27
Review 8:30

***

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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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Have your voice heard at the UN Climate Summit in NYC, September 23: http://bit.ly/WhyNotVe



Interview filming by Chris Cassella: http://bit.ly/ScienceAlertVe

Explanations for http://youtu.be/1Xp_imnO6WE
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or Instagram: http://bit.ly/VeInsta
or Facebook: http://bit.ly/FBVeritasium
For more on deflecting polar streams with electric fields, see:
http://pubs.acs.org/doi/abs/10.1021/ed077p1520


I'm in Hobart for a live show on Friday at UTAS followed by gigs in Sydney and Canberra next weekend.

Interactions between species are what define ecological communities, and community ecology studies these interactions anywhere they take place. Although interspecies interactions are mostly competitive, competition is pretty dangerous, so a lot of interactions are actually about side-stepping direct competition and instead finding ways to divvy up resources to let species get along. Feel the love?

Table of Contents
1) Competitive Exclusion Principle 2:02
2) Fundamental vs. Realized Niche 3:48
3) Eco-lography / Resource Partitioning 5:25
4) Character Displacement 7:29
5) Mutualism 9:15
6) Commensalism 9:55

References
http://www.sciencedaily.com/ar....ticles/c/competitive
http://www.youtube.com/watch?v=GbRPDGikcnc
http://www.instruction.greenri....ver.edu/mcvay/ES204%
http://www.sciencedaily.com/ar....ticles/e/ecological_
http://www.stanford.edu/group/stanfordbirds/text/essays/MacArthur's_Warblers.html
http://uts.cc.utexas.edu/~varanus/MacArthur.html
http://www.jstor.org/discover/10.2307/1383283?uid=3739960&uid=2129&uid=2&uid=70&uid=4&uid=3739256&sid=21101174112437
http://www.cals.ncsu.edu/cours....e/ent591k/symbiosis.
http://www.eoearth.org/article/Community_ecology
http://livingseas.org/2011/01/....22/killer-whales-sta
http://www.ecy.wa.gov/programs..../sea/pugetsound/beac
http://www.visitolympicpeninsu....la.org/tidepools.htm
http://www.annualreviews.org/d....oi/abs/10.1146/annur
http://eol.org/pages/484359/overview
http://www.geog.ubc.ca/biodive....rsity/efauna/Introdu
http://www.daviddarling.info/e....ncyclopedia/S/symbio
http://blogs.discovermagazine.....com/discoblog/2012/0
http://sites.sinauer.com/ecology2e/webext11.1.html
http://www.stanford.edu/group/stanfordbirds/text/essays/MacArthur's_Warblers.html
http://www.annualreviews.org/d....oi/pdf/10.1146/annur

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

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What is a monopoly? It turns out, it's more than just a board game. It's a terrible, terrible economic practice in which giant corporations dominate markets and hurt consumers. Except when it isn't. In some industries, monopolies are the most efficient way to do business. Utilities like electricity, water, and broadband internet access are probably less efficiently delivered in competitive markets. Come along, and let us monopolize your attention for a few minutes. You might learn something. And you might land on Free Parking.


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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You may think you know all about hypnosis from the movies. Zoolander, The Manchurian Candidate, etc... but there's a whole lot more going on. In this episode of Crash Course Psychology, Hank tells us about some of the many altered states of consciousness, including hypnosis.

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

--
Chapters:
Introduction: Hypnosis & Altered States of Consciousness 00:00
Facts & Fallacies About Hypnosis 2:00
How does hypnosis work? 3:05
Drug Tolerance & Neuroadaptation 4:49
Psychoactive Drugs 5:51
Depressants 6:28
Stimulants 7:35
Hallucinogens/Psychedelics 9:04
Non-Drug Induced Hallucinations 9:33
Review & Credits 10:32
--

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In which John Green teaches you WHY World War I started. Or tries to anyway. With this kind of thing, it's kind of hard to assign blame to any one of the nations involved. Did the fault lie with Austria-Hungary? Germany? Russia? Julius Caesar? One thing we can say for sure is that you can't blame the United States of America for this one. Woohoo! Well, you can hardly blame the US.

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Sources & further reading:
https://sites.google.com/view/....sources-supervolcano

The Earth is a gigantic ball of semi-molten rock, with a heart of iron as hot as the surface of the Sun. Titanic amounts of heat left over from its birth and the radioactive decay of trillions of tons of radioactive elements find no escape but up. Currents of rock spanning thousands of kilometers carry this energy to the surface. Earth’s crust is the only thing in their way. It feels solid to us, but it is only a fragile barrier, an apple skin around a flaming behemoth. True apocalypses can break through and unleash eruptions tens of times more powerful than all of our nuclear weapons combined, subjecting the climate to centuries worth of change in a single year, while drowning continents in toxic ash and gases: supervolcanoes. How big can they get? And will they put an end to humanity?

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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.

***

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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 we’re going to talk about urban planning — which is the design and regulation of space within urban areas. Urban planning helps weave together economic, social, and environmental goals within a region from work, to play, and living, and unsurprisingly, has a tremendous influence on people’s lives! So today, we’re going to discuss some models we’ve used to describe existing cities such as the Latin American Model, take a look at a planned city and the capital of Brazil, Brasília, and look at the impacts of the US highway system and redlining on minority Americans starting in the 1960s.

#CrashCourse #Geography #UrbanGeography

SOURCES

Planning History
https://www.nationalgeographic.....org/article/chicago
Latin America/Brazil
https://worldgeo.pressbooks.co....m/chapter/middle-and
https://www.researchgate.net/f....igure/Latin-American
https://www.researchgate.net/f....igure/Model-of-Latin
https://www.academia.edu/18612....4/Aztec_City_Plannin
https://www.smartcitiesdive.co....m/ex/sustainableciti
https://www.degruyter.com/docu....ment/doi/10.1515/opa
https://whc.unesco.org/en/list/445/lother=es
http://lanic.utexas.edu/projec....t/etext/llilas/vrp/h
https://www.britannica.com/place/Brasilia
https://www.bbc.com/news/magazine-20632277
https://www.sciencedaily.com/r....eleases/2017/09/1709
https://www.degruyter.com/docu....ment/doi/10.1515/opa
https://www.academia.edu/18612....4/Aztec_City_Plannin
http://www.public.asu.edu/~mes....mith9/1-CompleteSet/
Urban Renewal/Redlining
Sharma, Madhuri (2018) "Community Perspectives on Neighborhood Characteristics and Home-Buying Decisions," International Journal of Geospatial and Environmental Research: Vol. 5 : No. 1 , Article 3.  Available at: https://dc.uwm.edu/ijger/vol5/iss1/3 
https://www.cleveland.com/arch....itecture/2017/05/des
https://www.ideastream.org/new....s/redlining-racism-s
https://www.clevescene.com/cle....veland/what-the-hist
https://www.archives.gov/resea....rch/african-american
https://www.nps.gov/CRMJournal..../Winter2006/view1.pd
https://en.wikipedia.org/wiki/Urban_renewal
General Sources
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.pressbo....oks.com/front-matter
Cracking the AP Human Geography Exam: 2020 edition.  The Princeton Review.
Hobbs, Joseph J. Fundamental of World Regional Geography, 4th ed. Cengage. 2017.
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This week, Stan Muller teaches you how intellectual property law functions internationally. Like, between countries. Well, guess what. There's kind of no such thing as international law. But we can talk about treaties. There is a bevy of international treaties that regulate how countries deal with each others' IP. The upside is that this cooperation tends to foster international trade. The downside is that these treaties tend to stifle creativity by making it harder to shorten copyright terms. You win some, you lose some.

Crash Course is now 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 Brouwer, Jan Schmid, Steve Marshall, Anna-Ester Volozh, Sandra Aft, Brad Wardell, Christian Ludvigsen, Robert Kunz, Jason, A Saslow, Jacob Ash, Jeffrey Thompson, Jessica Simmons, James Craver, Simun Niclasen, SR Foxley, Roger C. Rocha, Nevin, Spoljaric, Eric Knight, Elliot Beter, Jessica Wode

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

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Instagram - https://www.instagram.com/thecrashcourse/

CC Kids: http://www.youtube.com/crashcoursekids

Visit https://www.abcmouse.com/learn/youtube to learn more about our award-winning online learning program for children 2-8!

🔍 Who squashed the squash in the garden? Join Ivy and Niko in this fun, problem-solving adventure as they try to solve the mystery of the squashed squash! Along the way, they make a new friend, Riley, and learn about how to make the garden more accessible for everyone. This engaging episode encourages kids to ask questions, think critically, and find creative solutions—all while having fun in Everybody's Garden! 🌱

👉 Discover more fun learning songs and educational videos by subscribing to our YouTube channel at https://YouTube.com/ABCmouse.
And visit https://www.abcmouse.com/learn/youtube to find out more about our award-winning online learning program for children 2–8!

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