Top Vídeos

Natural Selection - Crash Course Biology #14

admin
8 vistas · 8 años hace

Hank guides us through the process of natural selection, the key mechanism of evolution.

Crash Course Biology is now available on DVD! http://dftba.com/product/1av/C....rashCourse-Biology-T

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Table of Contents:
1) Natural Selection 1:27
2) Adaptation 2:56
3) Fitness 3:36
4) Four Principals 3:54
a. Variations 4:01
b. Heritability 4:17
c. "The Struggle for Existence" 4:25
d. Survival and Reproductive Rates 5:00
5) Biolography 5:59
6) Modes of Selection 7:40
a. Directional Selection 8:17
b. Stabilizing Selection 8:56
c. Disruptive Selection 9:27
7) Sexual Selection 10:22
8) Artificial Selection 11:24

References for this episode can be found in the Google document here: http://dft.ba/-2Ank

This video uses the following sounds from Freesound.org:
"20071104.forest.04.binaural.mp3" by dobroide
"ForestBirds.wav" by HerbertBoland

crashcourse, science, biology, natural selection, genetics, peppered moth, inherited traits, population genetics, charles darwin, darwin, on the origin of species, evolution, adaptation, galapagos finches, fitness, variation, phenotype, heritable, malthus, survival rate, reproductive rate, crossbreeding, inbreeding, genotype, directional selection, stabilizing selection, disruptive selection, selective pressures, sexual selection, artificial selection, selective breeding Support CrashCourse on Subbable: http://subbable.com/crashcourse

Economic Systems and Macroeconomics: Crash Course Economics #3

admin
8 vistas · 8 años hace

In which Jacob Clifford and Adriene Hill teach you about Economic Systems and Macroeconomics. So, economics is basically about choices. We'll look at some of the broadest economic choices when we talk about the difference between planned economies and market economies. We'll get into communism, socialism, command economies, and capitalism. We'll look at how countries choose the kind of system they're going to use (spoiler alert: many end up with mixed economies). We'll also look into how individuals make economic choices.

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, Anna-Ester Volozh, Robert Kunz, Jason A Saslow, Christian Ludvigsen, Chris Peters, Brad Wardell, Beatrice Jin, Roger C. Rocha, Eric Knight, Jessica Simmons, Jeffrey Thompson, Elliot Beter, Today I Found Out, James Craver, Ian Dundore, Jessica Wode, SR Foxley, Sandra Aft, Jacob Ash, Steve Marshall

TO: Everyone
FROM: Martin

To gild refined gold is just silly.

TO: Dana
FROM: Cameron

Still holding out. We're going to make it!

Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:

Raymond Cason, Marcel Pogorzelski, Cowgirlgem, Chua Chen Wei, Catherine Emond, Victoria Uney, Robin Uney, Damian Shaw,
Sverre Rabbelier

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Real Gases: Crash Course Chemistry #14

admin
8 vistas · 8 años hace

Hank bursts our ideal gas law bubble, er, balloon, and brings us back to reality, explaining how the constants in the gas law aren't all that constant; how the ideal gas law we've spent the past two weeks with has to be corrected for volume because atoms and molecules take up space and for pressure because they're attracted to each other; that Einstein was behind a lot more of what we know today than most people realize; and how a Dutch scientist named Johannes van der Waals figured out those correction factors in the late 19th century and earned a Nobel Prize for his efforts.

Table of Contents
Constants in the Gas Laws Aren't all that Constant 1:20
The Ideal Gas Law has to be Corrected for Volume and Pressure 3:26
Einstein was the Bomb 5:02
Van Der Waals Equation 9:38
Never Give Up! 10:08

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Legal System Basics: Crash Course Government and Politics #18

admin
8 vistas · 8 años hace

This week Craig Benzine takes a first look at the judicial branch. It's pretty easy to forget that the courts, and the laws that come out of them, affect our lives on a daily basis. But how exactly these decisions are made and where each law's jurisdiction starts and ends can get pretty complicated. So complicated in fact that you may want to smash something. But don't worry, Craig will clear the way.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Support is provided by Voqal: http://www.voqal.org

All Flickr.com images are licensed under Creative Commons by Attribution 2.0
http://creativecommons.org/lic....enses/by/2.0/legalco

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Representing Numbers and Letters with Binary: Crash Course Computer Science #4

admin
8 vistas · 8 años hace

Please take our PBS Digital Studios Survey! https://www.surveymonkey.com/r/pbsds2017

Today, we’re going to take a look at how computers use a stream of 1s and 0s to represent all of our data - from our text messages and photos to music and webpages. We’re going to focus on how these binary values are used to represent numbers and letters, and discuss how our need to perform operations on larger and more complex values brought us from our 8-bit video games to beautiful Instagram photos, and from unreadable garbled text in our emails to a universal language encoding scheme.

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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https://about.me/carrieannephilbin

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Evolution: It's a Thing - Crash Course Biology #20

admin
8 vistas · 8 años hace

Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

Crash Course Biology is now available on DVD! http://dft.ba/-8css

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Table of Contents
1) The Theory of Evolution 1:49
2) Fossils 2:42
3) Homologous Structures 4:36
4) Biogeography 7:02
5) Direct Observation 8:52

References for this episode can be found in the Google document here: http://dft.ba/-2Oyu

evolution, theory, biology, science, crashcourse, genetics, gene, facts, fossil, fossil record, dinosaur, extinct, extinction, organism, dorudon, rodhocetus, vestigial, structure, similarity, homologous structure, related, relationship, morganucodon, fore limb, hind limb, vertebrate, molecule, DNA, RNA, chimpanzee, fruit fly, biogeography, marsupial, finches, direct observation, drug resistance, resistance, selective pressure, italian wall lizard Support CrashCourse on Subbable: http://subbable.com/crashcourse

Who Can You Trust? Crash Course Navigating Digital Information #4

admin
8 vistas · 8 años hace

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)

Follow MediaWise and their fact-checking work across social:
https://www.instagram.com/mediawise/
https://www.youtube.com/mediawise
https://twitter.com/mediawise
https://www.facebook.com/MediaWise/

MediaWise is supported by Google.

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, Naman Goel, Patrick Wiener II, Nathan Catchings, Efrain R. Pedroza, Brandon Westmoreland, dorsey, Indika Siriwardena, James Hughes, Kenneth F Penttinen, Trevin Beattie, Satya Ridhima Parvathaneni, Erika & Alexa Saur, Glenn Elliott, Justin Zingsheim, Jessica Wode, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Brian Thomas Gossett, Khaled El Shalakany, SR Foxley, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, D.A. Noe, Shawn Arnold, Malcolm Callis, Advait Shinde, William McGraw, Andrei Krishkevich, Rachel Bright, Jirat, Ian Dundore
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The Shape of Data: Distributions: Crash Course Statistics #7

admin
8 vistas · 8 años hace

When collecting data to make observations about the world it usually just isn't possible to collect ALL THE DATA. So instead of asking every single person about student loan debt for instance we take a sample of the population, and then use the shape of our samples to make inferences about the true underlying distribution our data. It turns out we can learn a lot about how something occurs, even if we don't know the underlying process that causes it. Today, we’ll also introduce the normal (or bell) curve and talk about how we can learn some really useful things from a sample's shape - like if an exam was particularly difficult, how often old faithful erupts, or if there are two types of runners that participate in marathons!

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 Brouwer, Justin Zingsheim, Nickie Miskell Jr., Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Divonne Holmes à Court, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, Robert Kunz, SR Foxley, Sam Ferguson, Yasenia Cruz, Daniel Baulig, Eric Koslow, Caleb Weeks, Tim Curwick, Evren Türkmenoğlu, Alexander Tamas, D.A. Noe, Shawn Arnold, mark austin, Ruth Perez, Malcolm Callis, Ken Penttinen, Advait Shinde, Cody Carpenter, Annamaria Herrera, William McGraw, Bader AlGhamdi, Vaso, Melissa Briski, Joey Quek, Andrei Krishkevich, Rachel Bright, Alex S, Mayumi Maeda, Kathy & Tim Philip, Montather, Jirat, Eric Kitchen, Moritz Schmidt, Ian Dundore, Chris Peters,, Sandra Aft, Steve Marshall
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The Reagan Revolution: Crash Course US History #43

admin
8 vistas · 8 años hace

You can directly support Crash Course at https://www.patreon.com/crashcourse Subscribe for as little as $0 to keep up with everything we're doing. Free is nice, but if you can afford to pay a little every month, it really helps us to continue producing this content.

Crash Course World History is now available on DVD! Visit http://dft.ba/-CCWHDVD to buy a set for your home or classroom.

In which John Green teaches you about what is often called the Reagan Era. Mainly, it covers the eight years during which a former actor who had also been governor of the state of California was president of the United States. John will teach you about Reagan's election victory over the hapless Jimmy Carter, tax cuts, Reagan's Economic Bill of Rights, union busting, and the Iran-Contra among other things. Learn about Reagan's domestic and foreign policy initiatives, and even a little about Bonzo the Chimp.

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. Ronald Reagan signalled a shift to conservative values on the role of government, discussed in his "Time for Choosing" Speech: https://www.commonlit.org/text....s/from-a-time-for-ch
America turned to President Reagan for comfort in times of tragedy, including following the Challenger Disaster: https://www.commonlit.org/text....s/ronald-reagan-on-t

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Biper y Sus Amigos - Un Amigo

user100
8 vistas · 7 años hace

Biper y Sus Amigos - Un Amigo "Estreno" [4K]

Amiguitos recuerden que todos somos amados por Jesus y por ello les traemos una increíble canción que nos pondrá a cantar a todos y decir que Jesus nos ama.

Escuchanos en las plataformas digitales
Spotify:
https://open.spotify.com/album..../7D5iViMUxXlPr6rVVml
TIDAL:
https://tidal.com/browse/artist/4068995
iTunes:
https://itunes.apple.com/mx/ar....tist/biper-y-sus-ami

Amiguitos! este es el nuevo video oficial de nuestra canción
"Un Amigo", esperemos que lo disfruten al máximo, reciban un saludo de parte de toda la banda!

Escucha Nuestra Playlist en Spotify creada especialmente para ti:
https://open.spotify.com/user/....0xjqbzh0admmhmcljq1f

Suscribete, comparte y comenta en nuestros vídeos:
https://www.youtube.com/user/Biperysusamigos

Síguenos en nuestras redes sociales:
Facebook.
https://www.fb.com/biperysusamigosoficial
Twitter.
https://twitter.com/biperoficial

Letra de la canción:

Yo tengo un amigo que me ama, me ama, me ama
Yo tengo un amigo que me ama, su nombre es Jesús
Él me ama, Él me ama, Él me ama y con tierno amor
Él me ama, Él me ama, su nombre es Jesús

Tú tienes un amigo que te ama, te ama, te ama
Tú tienes un amigo que te ama, su nombre es Jesús
Él te ama, Él te ama, Él te ama y con tierno amor
Él te ama, Él te ama, su nombre es Jesús

Tenemos un amigo que nos ama, nos ama, nos ama
Tenemos un amigo que nos ama, su nombre es Jesús
Él nos ama, Él nos ama, Él nos ama y con tierno amor
Él nos ama, Él nos ama, su nombre es Jesús

Biper y sus amigos en un canal de canciones infantiles divertidas, fáciles de aprender y con un buen mensaje para la vida.

HEAVEN NETWORKS, HEAVEN KIDS, HEAVEN MUSIC GROUP, HEAVEN MUSIC & HEAVEN PUBLISHING

Biper y sus amigos - La Hormiguita Hippie

user100
8 vistas · 7 años hace

Biper y sus amigos - La Hormiguita Hippie

Biper y sus amigos en un canal de canciones infantiles divertidas, faciles de aprender y con un buen mensaje para la vida.

Escuchanos en las plataformas digitales
Spotify:
https://open.spotify.com/album..../7D5iViMUxXlPr6rVVml
TIDAL:
https://tidal.com/browse/artist/4068995
iTunes:
https://itunes.apple.com/mx/ar....tist/biper-y-sus-ami

Escucha Nuestra Playlist en Spotify creada especialmente para ti:
https://open.spotify.com/user/....0xjqbzh0admmhmcljq1f

Suscribete, comparte y comenta en nuestros vídeos:
https://www.youtube.com/user/Biperysusamigos

Síguenos en nuestras redes sociales:
Facebook:
https://www.FB.com/biperysusamigosoficial
Twitter:
https://twitter.com/biperoficial

Letra:

Uy!! mira Biper una Hormiguita
con una mochila jaja
Y se esta escapando de a casa
eso, eso no esta bien Biper no?
Claro que no esta bien
ahora ahora te voi a contar lo que le paso

La hormiguita hippie (wawawawa)
no trabaja mas (wawawa)
Y de mochilera la vieron pasar (wawawa)

Con el pelo largo (largo)
y un lindo collar (collar)
Y mascando chicle llego a la ciudad.

Coro:

Viajo en un caballo
Viajo en un tractor
Viajo en una bota
Viajo en una flor

Viajo en una vaca
También en camión
Viajo en tres perritos
Y en un ventarrón

La hormiguita hippie (hippie)
no trabaja mas (mas)
Y de mochilera llego a la ciudad

Un grillo, un mosquito
La cigarra y yo
cantamos a coro lo que le paso

Viajo en un caballo
Viajo en un tractor
Viajo en una bota
Viajo en una flor

Viajo en una vaca
También en camión
Viajo en tres perritos
Y en un ventarrón
(uy que rápido)

La hormiguita hippie (hippie)
no trabaja mas (mas)
Y ya no comía por no trabajar

Tenía mucha hambre
Su ropa se gasto (toda fea)
Y estaba perdida en fea condición

Viajo en un caballo
Viajo en un tractor
Viajo en una bota
Viajo en una flor

Viajo en una vaca
También en camión
Viajo en tres perritos
Y en un Ventarrón

Regreso a su casa (casa)
Con mucho temor (temor)
Su papá corriendo llego y la abrazo (que bueno)
Le dio la bienvenida y también la perdono (buenísimo)
Y ella no quería dejar de trabajar.

HEAVEN NETWORKS, HEAVEN MUSIC GROUP, HEAVEN KIDS, HEAVEN MUSIC & HEAVEN PUBLISHING