Top Vídeos
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In which John Green teaches you about the fall of the Roman Empire, which happened considerably later than you may have been told. While the Western Roman Empire fell to barbarians in 476 CE, the Byzantines in Constantinople continued the Eastern Empire nicely, calling themselves Romans for a further 1000 years. Find out what Justinian and the rest of the Byzantine emperors were up to over there, and how the Roman Empire dragged out its famous Decline well into medieval times. In addition to all this, you'll learn about ancient sports riots and hipster barbarians, too.
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Metabolism is a complex process that has a lot more going on than personal trainers and commercials might have you believe. Today we are exploring some of its key parts, including vital nutrients -- such as water, vitamins, minerals, carbs, fats, and proteins -- as well as how anabolic reactions build structures and require energy, while catabolic reactions tear things apart and release energy.
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Table of Contents
Water, Vitamins, Minerals, Carbs, Fats and Proteins 3:47
Anabolic Reactions Build Structures and Require Energy 2:59
Catabolic Reactions Tear Things Apart and Release Energy 3:17
Metabolism 2:30
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In this episode of Crash Course Chemistry, Hank discusses what Molecules actually look like and why, some quantum-mechanical three dimensional wave functions are explored, he touches on hybridization, and delves into sigma and pi bonds.
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Table of Contents
Molecules: Clumpy Globs... 0:18
Quantum-Mechanical Three-Dimensional Wave Functions 3:06
S & P Orbital Hybridization 5:27
Sigma & Pi Bonds 7:32
Hybridized Orbitals 5:52
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•••SUBBABLE MESSAGE•••
TO : Phoebe and James McMullan
FROM : Dad
Continue being awesome Phoebe & James from John & Hank!
***
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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.
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Table of Contents:
Epithelial Tissue Creates Inner & Outer Boundaries 2:19.3
Layering: Simple or Stratefied 5:26
Shape: Squamous, Cuboidal, or Columnar 3:34.5
Epithelial Cells Are Polar 7:17.4
Apical & Basal Sides 7:22
Selectively Permeable 7:43
Glandular Epithelial Tissue Forms Endocrine & Exocrine Glands 8:20.3
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The majority of the universe is made up of a currently mysterious entity that pervades space: dark energy. We don’t know exactly what it is, but we do know that dark energy accelerates the expansion of space. We think this means the Universe will expand forever, even as our view of it shrinks while space expands faster all the time.
Crash Course Astronomy Poster: http://store.dftba.com/product....s/crashcourse-astron
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GEOMETRY OF THE UNIVERSE RESOURCES
Geometry:
http://abyss.uoregon.edu/~js/c....osmo/lectures/lec15.
http://starchild.gsfc.nasa.gov..../docs/StarChild/ques
Expanding faster than light:
http://curious.astro.cornell.e....du/legal-information
General expansion:
https://en.wikipedia.org/wiki/....Metric_expansion_of_
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Table of Contents
Majority of the Universe is Made of Dark Energy 4:35
Dark Energy Accelerates the Expansion of Space 3:42
We Think The Universe Will Expand Forever 5:20
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PHOTOS/VIDEOS
The Big Bang http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=1 [credit: NASA]
Collision Scenario for Milky Way and Andromeda Galaxy Encounter http://www.nasa.gov/images/con....tent/654284main_i122 [credit: NASA; ESA; A. Feild and R. van der Marel, STScI]
Artist's impression of vampire star http://www.spacetelescope.org/videos/astro_bn/ [credit: ESO/M. Kornmesser]
Host Galaxies of Distant Supernovae http://www.nasa.gov/sites/defa....ult/files/images/593 [credit: NASA, ESA, and A. Riess (STScl)]
Dark Energy Expands the Universe http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=1 [credit: NASA]
Expanding Universe http://www.spacetelescope.org/....videos/hst15_expandi [credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)]
Hubble Ultra Deep Field 2014 http://hubblesite.org/newscent....er/archive/releases/ [credit: NASA, ESA, H. Teplitz and M. Rafelski (IPAC/Caltech), A. Koekemoer (STScI), R. Windhorst (Arizona State University), and Z. Levay (STScI)]
Last week we introduced Thomas Aquinas’s four cosmological arguments for the existence of god; today we introduce his fifth argument: the teleological argument, and the ensuing dialogue it initiated.
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Bokeh Spiral by Eric Wüstenhagen: https://www.flickr.com/photos/eriwst/2987739376
Gusano alambre (wireworms) by jacinta lluch valero: https://www.flickr.com/photos/....70626035@N00/8817671
Experimental by Peter Klashorst: https://commons.wikimedia.org/....wiki/File:Baby_playi
Flightless Cormorant by Mike Weston: https://www.flickr.com/photos/mikeweston/331214460
All other images via Wikimedia Commons, licensed under Creative Commons by 4.0: https://creativecommons.org/licenses/by/4.0/
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Today Phil explores the world of tides! What is the relationship between tides and gravity? How do planets and their moons become tidally locked? What would happen if you were 300km tall? Important questions.
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Gravity Over Distance 0:44
Tidal Force Parameters 1:35
Battle of the Bulges 2:55
Tidal Lock 6:17
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PHOTO/VIDEO CREDITS
Photo & video credit: "NASA's Scientific Visualization Studio"
http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=4 Photo credit: "NASA's Scientific Visualization Studio"
https://www.flickr.com/photos/....gsfc/8556665115/in/p
http://svs.gsfc.nasa.gov/cgi-b....in/details.cgi?aid=1
The Hopewell Rocks - https://www.youtube.com/watch?v=EnDJ6_XpGfo
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In which John Green teaches you about the early days of the Civil Rights movement. By way of providing context for this, John also talks a bit about wider America in the 1950s. The 1950s are a deeply nostalgic period for many Americans, but there is more than a little idealizing going on here. The 1950s were a time of economic expansion, new technologies, and a growing middle class. America was becoming a suburban nation thanks to cookie-cutter housing developments like the Levittowns. While the white working class saw their wages and status improve, the proverbial rising tide wasn't lifting all proverbial ships. A lot of people were excluded from the prosperity of the 1950s. Segregation in housing and education made for some serious inequality for African Americans. As a result, the Civil Rights movement was born. John will talk about the early careers of Martin Luther King, Thurgood Marshall, Rosa Parks, and even Earl Warren. He'll teach you about Brown v Board of Education, and the lesser known Mendez vs Westminster, the Montgomery Bus Boycott, and all kinds of other stuff.
Crash Course World History is now available on DVD! Visit http://dft.ba/-CCWHDVD to buy a set for your home or classroom.
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 Civil Rights Movement gained national attention with the murder of Emmett Till in 1955: https://www.commonlit.org/texts/emmett-till
That same year, Rosa Parks refused to give up her seat on a Montgomery bus, beginning the Montgomery bus boycott: https://www.commonlit.org/text....s/rosa-parks-and-the
A young preacher named Martin Luther King Jr. gained national fame rallying support for the Montgomery bus boycott: https://www.commonlit.org/text....s/martin-luther-king
The end of segregation also began in the South with the Showdown in Little Rock in 1957: https://www.commonlit.org/text....s/showdown-in-little
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What is light? That is something that has plagued scientists for centuries. It behaves light a wave... and a particle... what? Is it both? In this episode of Crash Course Physics, Shini introduces to the idea of Quantum Mechanics and how it helps us understand light. Also, there's this thing called the ULTRAVIOLET CATASTROPHE!
Want more Crash Course in person? We'll be at NerdCon: Nerdfighteria in Boston on February 25th and 26th! For more information, go to http://www.nerdconnerdfighteria.com/
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In today’s episode, Hank asks you to consider all the ways people talk about justice and what we really mean when we use that word. We’ll explain various theories of justice, just distribution, and different approaches to punishment.
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All other images and video either public domain or via VideoBlocks, or Wikimedia Commons, licensed under Creative Commons BY 4.0: https://creativecommons.org/licenses/by/4.0/
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Population ecology is the study of groups within a species that interact mostly with each other, and it examines how they live together in one geographic area to understand why these populations are different in one time and place than they are in another. How is that in any way useful to anyone ever? Hank uses the example a of West Nile virus outbreak in Texas to show you in this episode of Crash Course: Ecology.
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Table of Contents
1) Density & Dispersion 02:03
2) Population Growth 03:07
3) Limiting Factors 03:45
a) Density Dependent 06:16
b) Density Independent 07:11
4) Exponential & Logistical Growth 08:04
5) How to Calculate Growth Rate 09:33
References:
http://www.latimes.com/news/na....tion/nationnow/la-na
http://www.dshs.state.tx.us/id....cu/disease/arboviral
http://en.wikipedia.org/wiki/Mosquito
http://www.nature.com/scitable..../knowledge/library/p
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In which John Green teaches you about the United States Constitution. During and after the American Revolutionary War, the government of the new country operated under the Articles of Confederation. While these Articles got the young nation through its war with England, they weren't of much use when it came to running a country. So, the founding fathers decided try their hand at nation-building, and they created the Constitution of the United States, which you may remember as the one that says We The People at the top. John will tell you how the convention came together, some of the compromises that had to be made to pass this thing, and why it's very lucky that the framers installed a somewhat reasonable process for making changes to the thing. You'll learn about Shays' Rebellion, the Federalist Papers, the elite vs rabble dynamic of the houses of congress, and start to find out just what an anti-federalist is.
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.Founding Fathers debated over how to govern the new nation, beginning with the Articles of Confederation: https://www.commonlit.org/text....s/articles-of-confed
When the Founding Fathers finally wrote the Constitution, they realized that they needed to add The Bill of Rights to get citizens on board with the new government: https://www.commonlit.org/texts/the-bill-of-rights
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Today, Craig is going to dive into the controversy of monetary and fiscal policy. Monetary and fiscal policy are ways the government, and most notably the Federal Reserve, influences the economy - for better or for worse. So we’re going to start by looking at monetary policy, and specifically how the Federal Reserve uses interests rates as a means of controlling (or at least attempting to control) inflation. We’ll then move onto fiscal policy - that is the government’s use of taxation to raise and spend money. It’s all, well, pretty controversial, but as it seems Americans hate taxes the most, monetary policy is most often used - meaning that the Federal Reserve plays a hugely significant role in steering the U.S. economy.
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Hank brings us to the next level of ecological study with ecosystem ecology, which looks at how energy, nutrients, and materials are getting shuffled around within an ecosystem (a collection of living and nonliving things interacting in a specific place), and which basically comes down to who is eating who.
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Table of Contents
1) Defining Ecosystems 0:49:1
2) Trophic Structure 4:44:1
a) Primary Producers 5:27
b) Primary Consumers 5:41
c) Secondary Consumers 5:49:1
d) Tertiary Consumers 5:58:2
e) Detrivores 6:08:1
3) Bioaccumulation 8:47
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Last week, we met the Presocratics: despite having by any reasonable standard invented science in Europe, these thinkers are lumped together today as simply “not Socrates.”
So who was this smarty pants? In this episode Hank talks to us about Socrates and his two important students, Plato and Aristotle.
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Today we are investigating our moral obligations to our parents and our families. Do we owe our parents anything as adults? Would it be a good idea to license parents? We’ll explore these questions as well as the ethics of care, and some potential problems that type of approach to morality carries with it.
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This episode was sponsored by Prudential. Go to http://Raceforretirement.com and see how quickly 1% can add up.
You’re probably familiar with the basics of magnets already: They have a north pole and a south pole. Two of the same pole will repel each other, while opposites attract. Only certain materials, especially those that contain iron, can be magnets. And there’s a magnetic field around Earth, which is why you can use a compass to figure out which way is north. In this episode of Crash Course Physics, Shini takes us into the world of magnetism!
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So we ended last episode at the start of the 20th century with special purpose computing devices such as Herman Hollerith’s tabulating machines. But as the scale of human civilization continued to grow as did the demand for more sophisticated and powerful devices. Soon these cabinet-sized electro-mechanical computers would grow into room-sized behemoths that were prone to errors. But is was these computers that would help usher in a new era of computation - electronic computing.
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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.
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This week Craig is going to give you a broad overview of elections in the United States. So as you may have noticed, there are kind of a lot of people in the U.S, and holding individual issues up to a public vote doesn't seem particularly plausible. So to deal with this complexity, we vote for people, not policies, that represent our best interests. But as you'll see, this process was not thoroughly addressed in the Constitution, so there have been a number of amendments and laws at the state level implemented to create the election system we all know and (maybe) love today.
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