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4 vistas · 7 años hace

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

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admin
4 vistas · 7 años hace

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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Follow Phil on Twitter: https://twitter.com/badastronomer

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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

admin
4 vistas · 7 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.

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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4 vistas · 7 años hace

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

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4 vistas · 7 años hace

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.


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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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/

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

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4 vistas · 7 años hace

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
Campbell Biology 9th ed. Support CrashCourse on Subbable: http://subbable.com/crashcourse

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4 vistas · 7 años hace

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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4 vistas · 7 años hace

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.

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

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

All attributed images are licensed under Creative Commons by Attribution 4.0
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4 vistas · 7 años hace

In which John Green, Hank Green, and Emily Graslie teach you about, well, everything. Big History is the history of everything. We're going to start with the Big Bang, take you right through all of history (recorded and otherwise), and even talk a little bit about the future. It is going to be awesome. In the awe-inspiring sense of the word awesome. In this episode, we walk you through the start of everything: The Big Bang. We'll look at how the universe unfolded at its very beginning, and how everything in the universe that we know today came into being. So that's kind of a big deal, right?

For more information, visit www.bighistoryproject.com

admin
4 vistas · 7 años hace

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


References and image licenses for this episode in the Google doc here: http://dft.ba/-3f2M Support CrashCourse on Subbable: http://subbable.com/crashcourse

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4 vistas · 7 años hace

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


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.

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Glenn Elliott, Justin Zingsheim, 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, 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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4 vistas · 7 años hace

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.

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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The Latest from PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO

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

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4 vistas · 7 años hace

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

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4 vistas · 7 años hace

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.

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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4 vistas · 7 años hace

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.

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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4 vistas · 7 años hace

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.

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

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

All attributed images are licensed under Creative Commons by Attribution 4.0
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4 vistas · 7 años hace

Welcome to Crash Course Statistics! In this series we're going to take a look at the important role statistics play in our everyday lives, because statistics are everywhere! Statistics help us better understand the world and make decisions from what you'll wear tomorrow to government policy. But in the wrong hands, statistics can be used to misinform. So we're going to try to do two things in this series. Help show you the usefulness of statistics, but also help you become a more informed consumer of statistics. From probabilities, paradoxes, and p-values there's a lot to cover in this series, and there will be some math, but we promise only when it's most important. But first, we should talk about what statistics actually are, and what we can do with them. Statistics are tools, but they can't give us all the answers.

Episode Notes:

On Tea Tasting:
"The Lady Tasting Tea" by David Salsburg

On Chain Saw Injuries:
https://www.cdc.gov/disasters/chainsaws.html
https://www.ncbi.nlm.nih.gov/pubmed/15027558
https://www.hindawi.com/journals/aem/2015/459697/

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, 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, Justin Zingsheim, 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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user37
4 vistas · 7 años hace

This tutorial shows how to model a polar bear in clay. It is narrated.
Subscribe on Patreon: https://www.patreon.com/artistleonardo
My drawing book: http://amzn.to/1K7L8Ed
Visit me on FB: https://www.facebook.com/LeonardoPereznieto
My website: http://www.ArtistLeonardo.com/

Do you want to help me translating it into your language?
(Note: First check if it hasn´t been translated already by pressing the "CC" button on the lower part of the video).
To translate the title of the video and the subtitles, all you need to do is to please go to the following link and translate (you don't necessarily need to do the whole thing, you can do a section and other people in the community can finish it). Thank you!:
http://www.youtube.com/timedtext_video?v=lvHAecT6vhE&ref=share

If you would like to invest in a drawing, painting or sculpture by Leonardo Pereznieto, or to hire him for workshops or lectures, please write to: info@artistleonardo.com (Business only, not for personal messages.)

List of materials:
Note: I have been buying my modelling tools for many many years and in different countries, therefore, today I couldn't find the exact tools I used in this video. But following are equivalent ones:

- Modelling clay (wax based, non-hardening): http://amzn.to/2qOI40v

The above clay, like the one I used, is oil-based and it never hardens. If you would rather have your sculpture to harden, you may prefer to use something like the following:

- Modelling clay (self-hardening): http://amzn.to/2rutcoQ

- Clay sculpting and pottery set: http://amzn.to/2q4LxZo

- Wax Carving toolset: http://amzn.to/2ruVPlG

- Spatula: http://amzn.to/2rKciji

- Wooden cutting boards (this is totally optional): http://amzn.to/2ruZjob

- Heavy duty rotating base: http://amzn.to/2qb6UUV

If you would like to see photos and brands of my tools, please go to my blog about materials with the following link:

http://fineart-tips.blogspot.m....x/2014/11/with-relea


Download Fine Art-Tips mobile app:

On the Apple Store:

For iPhone/iPad free: https://itunes.apple.com/us/ap....p/fine-art-tips-draw

For iPhone/iPad, Premium: https://itunes.apple.com/us/ap....p/fine-art-tips-prem

On Google Play:

For Android free: https://play.google.com/store/apps/details?id=allmax.fine.art.tips.free2&hl=en

For Android, Premium: https://play.google.com/store/apps/details?id=allmax.fine.art.tips2&hl=en

You may also follow me on:

My Blog: http://fineart-tips.blogspot.mx/

My Twitter: https://twitter.com/#!/ArtistLeonardo

Fine Art Tips on Google+: http://goo.gl/TqsmiJ

My Instagram: http://instagram.com/artistleonardo

My LinkedIn: http://www.linkedin.com/profile/view?id=89957576&trk=tab_pro

My Pinterest: http://pinterest.com/ArtistLeonardo/

My VK: http://vk.com/leonardopereznieto

My website: http://www.artistleonardo.com/

I wish you great creations!

Audio file(s) provided by http://www.audiomicro.com

This tutorial shows How to Model (Sculpt) a Polar Bear in Clay - Narrated

user37
4 vistas · 7 años hace

Visit me on FB: https://www.facebook.com/LeonardoPereznieto
Visit my website: http://www.artistleonardo.com/

Do you want to help me translating it into your language?
(Note: First check if it hasn´t been translated already by pressing the "CC" button on the lower part of the video).
All you need to do is to please translate the file at the link below and send it to me:
https://docs.google.com/file/d..../0B0UOw8r7hWG2bGY0Y2

Visit: http://www.fineartebooks.com/ for free drawing tutorials.

If you would like to invest in a drawing, painting or sculpture by Leonardo Pereznieto, or to hire him for workshops or lectures, please write to: info@leopereznieto.com (Business only, not for personal messages.)

List of materials:

Mechanical pencil with 0.5 HB lead
Tombow, Dual Brush color markers set
Black marker 005 mm, Prismacolor
Pastel pencils set: Carb-Othello (Schwan - Stabilo)
Kneaded eraser
MagicRub FaberCastell eraser
Soft, synthetic brush
Fabriano white drawing paper, fine grain

If you would like to see photos and brands of my tools, please go to my blog about materials with the following link:

http://www.fineartebooks.com/howtodraw_drawingschool/My_Blog/Entries/2012/8/1_My_materials.html

You may also follow me on:

My Blog: http://www.fineartebooks.com/howtodraw_drawingschool/My_Blog/My_Blog.html

Twitter: https://twitter.com/#!/ArtistLeonardo

LinkedIn: http://www.linkedin.com/profile/view?id=89957576&trk=tab_pro

Google+: https://plus.google.com/u/0/11....1857897747330152383/

http://instagram.com/artistleonardo

VK: http://vk.com/leonardopereznieto

Leonardo Pereznieto: http://www.leonardopereznieto.com/leo/Intro.html

Audio file(s) provided by http://www.audiomicro.com

This tutorial shows how to draw Reflection on Sunglasses, how to draw a beach with markers
Как Нарисовать Отражение на Солнцезащитных Очках
Як Намалювати Відображення на Сонцезахисних Окулярах
Hogyan rajzoljunk tükröződést napszemüvegre
Jak Narysować Odbicie w Okularach Przeciwsłonecznych
Как се рисува отражение на слънчеви очила
如何画有反射的太阳眼镜
Comment dessiner un reflet sur des lunettes de soleil

user37
4 vistas · 7 años hace

Tutto3 pencil: https://igg.me/at/tutto3

My drawing book: http://amzn.to/1K7L8Ed
Visit me on FB: https://www.facebook.com/LeonardoPereznieto
My website: http://www.ArtistLeonardo.com/

Do you want to help me translating it into your language?
(Note: First check if it hasn´t been translated already by pressing the "CC" button on the lower part of the video).
All you need to do is to please go to the following link and translate. Thank you!:
http://www.youtube.com/timedtext_video?v=blO1reAhMYk&ref=share


If you would like to invest in a drawing, painting or sculpture by Leonardo Pereznieto, or to hire him for workshops or lectures, please write to: info@artistleonardo.com (Business only, not for personal messages.)

List of materials:

Mechanical pencil: Tutto3 by ArtistLeonardo , with 0.3mm 2H lead, 0.5 HB and 0.7 mm B lead
Kneaded eraser Prismacolor
Fabriano white drawing paper, fine grain

If you would like to see photos and brands of my tools, please go to my blog about materials with the following link:

http://fineart-tips.blogspot.m....x/2015/07/my-drawing


Download Fine Art-Tips mobile app:

On the Apple Store:

For iPhone/iPad free: https://itunes.apple.com/us/ap....p/fine-art-tips-draw

For iPhone/iPad, Premium: https://itunes.apple.com/us/ap....p/fine-art-tips-prem

On Google Play:

For Android free: https://play.google.com/store/apps/details?id=allmax.fine.art.tips.free2&hl=en

For Android, Premium: https://play.google.com/store/apps/details?id=allmax.fine.art.tips2&hl=en

You may also follow me on:

My Blog: http://fineart-tips.blogspot.mx/

My Twitter: https://twitter.com/#!/ArtistLeonardo

Fine Art Tips on Google+: http://goo.gl/TqsmiJ

My Google+ page as an artist (with my sculptures, paintings, etc): https://plus.google.com/+Artistleonardo/posts

My Instagram: http://instagram.com/artistleonardo

My LinkedIn: http://www.linkedin.com/profile/view?id=89957576&trk=tab_pro

My Vine: https://vine.co/v/hKnn3rbwJmT

My Pinterest: http://pinterest.com/ArtistLeonardo/

My VK: http://vk.com/leonardopereznieto

My website Leonardo Pereznieto: http://www.leonardopereznieto.com/leo/Intro.html

I wish you great creations!

Audio file(s) provided by http://www.audiomicro.com

This tutorial shows How to Draw a Tree With Pencil




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