Here are our top five mating fights! From ibexes to elephant seals, watch as these species do battle to find a mate.
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Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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There's a story in every grain of sand: tales of life and death, fire and water. If you scooped up a handful of sand from every beach, you'd have a history of the world sifting through your fingers.

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DEEP LOOK: a new ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small.

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---+ How does sand form?

Sand can be anything that has been worn down until it’s reduced to some tiny, essential fragment of what it once was: a granite pebble from the mountains; coral from the sea; obsidian from a volcano; even skeletons of microscopic sea animals. It's also a technical term. Bigger than sand, that’s gravel, smaller? Silt.

By studying the composition and texture of sand, geologists can reconstruct its incredible life history. “There’s just a ton of information out there, and all of it is in the sand,” said Mary McGann, a geologist at the United States Geological Survey in Menlo Park, CA.

McGann recently took part in a comprehensive research project mapping sand’s journey into and throughout San Francisco Bay.

Patrick Barnard, another USGS geologist who helped oversee the project, said that it will help scientists understand how local beaches are changing over time. In particular, Barnard wants to understand why beaches just south of San Francisco Bay are among the most rapidly eroding beaches in the state.

From 2010-2012, Barnard and his team sampled beaches, outcrops, rivers and creeks to track sand’s journey around the bay. They even collected sand from the ocean floor. The researchers then carefully analyzed the samples to characterize the shapes, sizes, and chemical properties of the sand grains.

Barnard said the information provides a kind of fingerprint, or signature, for each sample that can then be matched to a potential source. For example, certain minerals may only come from the Sierra Mountains or the Marin Headlands.

“If we’ve covered all of the potential sources, and we know the unique signature of the sand from these different sources, and we find it on a beach somewhere, then we basically know where it came from,” explained Barnard.

And those species aren’t the only things finding their way into the sand. Manmade materials can show up there, too. McGann has found metal welding scraps and tiny glass spheres (commonly sprinkled on highways to make road stripes reflective) in sand samples from around the bay.

“All of these things can get washed into our rivers or our creeks, or washed off the road in storm drains,” explained McGann. “Eventually they end up in, for example, San Francisco Bay.”

By piecing together all of these clues – the information found in the minerals, biological material and man made objects that make up sand – the researchers ended up with a pretty clear picture of how sand travels around San Francisco Bay.

Some sands stay close to home. Rocky sand in the Marin Headlands comes from nearby bluffs, never straying far from its source.

Other sands travel hundreds of miles. Granite from the Sierra Nevada mountains careens down rivers and streams on a century-long sojourn to the coast.

In fact, much of the sand in the Bay Area comes from the Sacramento and San Joaquin rivers, with local watersheds also playing an important role in transporting sand to the beach.

Although this project focused on San Francisco Bay, the same techniques could be used to study other coastal systems, he added, revealing the incredible life stories of sand from around the world.

---+ More Deep Look episodes:

What Happens When You Zap Coral With The World's Most Powerful X-ray Laser?
https://youtu.be/aXmCU6IYnsA

These 'Resurrection Plants' Spring Back to Life in Seconds
https://youtu.be/eoFGKlZMo2g

--
Full article: http://blogs.kqed.org/science/....2014/11/04/the-amazi

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---+ About KQED

KQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, Radio and web media.

Funding for Deep Look is provided in part by PBS Digital Studios and the John S. and James L. Knight Foundation. Deep Look is a project of KQED Science, which is also supported by HopeLab, the David B. Gold Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Smart Family Foundation and the members of KQED.
#deeplook

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"Pájaros hacen caca. MUCHA caca..."

Visite la pagina http://kiskeya.life/guano para una lista de las fuentes de este episodio.

Visite http://kiskeya.life para mas vídeos y artículos en Ingles y Español sobre Quisqueya!

¡Duda, investiga y aprende!

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Créditos:

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Productor Ejecutivo Lola Mendez
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"Don't touch my rum!"

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Credits:

Music by:
Joakim Karud "Great Days"

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Alejandro Bermúdez - Preguntas y respuestas

Om Nom Stories: FOOTBALL MATCH | Learn Colors with Colorful Soccer Balls for Kids by Om Nom

Om Nom along with his best friend Om Nelle are now entering the magical world of learning where every day they learn something new about shapes, colors, numbers and more! Come along kids and join your ever favorite #OmNom in this new and exclusive #cartoon collection of #LearningWithOmNom!


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Learn Colors with Om Nom Face Painting:
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Learn Numbers and Colors with Underwater Sea Animals:
https://www.youtube.com/watch?v=pe-sz...

Om Nom Arts and Crafts:
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I love YouTube, but seriously, can we employ a bit of rational thinking please? Thank you. More FILMMAKING videos to come.

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NOTE: Some of the links are affiliate links which means I get a small commission (you don't pay more). I use that to to cover expenses to keep this channel going so I can help improve your videos and filmmaking. It is very much appreciated!

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Oso Yogi - 09.- Oso Desconcertado

Daniel Calveti, Marcos Brunet , Ingrid Rosario, Nimsy Lopez, Julissa, René González, Yashira Guidini, Funky y Jacobo Ramos. Unidos en una gran noche de adoración en Puerto Rico.

Se realizó el 7 de enero de 2018 en el Coliseo de Puerto Rico, José Miguel Agrelot.

Tema del álbum en vivo desde Puerto Rico "Vivo Para Ti" publicado en 2005.

video musical

Domingo 13/septiembre/2015
Envío para la gloria de Dios el concierto que nuestro amado hno. Roberto Orellana ofreció en el TBB Apopa.

We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the sliding filament model. Your skeletal muscles are constructed like a rope made of bundles of protein fibers, and that the smallest strands are your actin and myosin myofilaments. Its their use of calcium and ATP that causes the binding and unbinding that makes sarcomeres contract and relax.

Table of Contents
Smooth, Cardiac, and Skeletal Muscles Create Movement 1:18
Sliding Filament Model 4:52
Skeletal Muscles Are Made of Bundles of Protein Fibers 2:40
Actin and Myosin Myofilaments 3:54
Calcium and ATP Cause the Binding and Unbinding 5:05

***

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

***SUBBABLE MESSAGES***

TO: SEM students
FROM: Mrs. S

You are confident and courageous! I believe in you! DFTBA!

--

TO: Zachary
FROM: She who gave you life!

You, like the Mongols, will always be the exception.

***SUPPORTER THANK YOU!***

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:

David Rybka, Beth Larter, Damian Shaw, Randy Goldberg MD, Cynthia Krohn, Allison DeVoe, Brinae Lois Gaudet, Sara Bovi, Stephen DeCubellis, Travis Bell

--

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Watch Blaze and the Monster Machines tranform from a monster truck into everything from a rollercoaster to a kite! Watch more of Blaze's transformations in Blaze and the Monster Machines full episodes, which are available to stream for FREE in the Nick Jr. App, or download them for offline play in Google Play.

Want more Blaze and the Monster Machines?

Watch Blaze and the Monster Machines, weekdays on Nickelodeon: http://www.nickjr.com/tvschedule/

Stream full episodes for FREE in the Nick Jr. App on Roku and Apple TV or download Blaze and the Monster Machine episodes for offline viewing on iTunes and Google Play: https://play.google.com/store/tv/show/Blaze_and_the_Monster_Machines?id=v_-2hJWg8J4&cdid=tvseason-iCYrYdQwC7MJWs1TU6qbng

Preschoolers can watch full episodes, play games, and more in the free Nick Jr. App and at NickJr.com:
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Google Play: https://play.google.com/store/....apps/details?id=com.
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Download the Blaze and the Monster Machines App on iTunes, Google Play, and Amazon:
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HUEVOS SORPRESAS LAS RUEDAS DEL AUTOBÚS - ChuChu TV Sorpresa (Español)

CONSIGUE CUT THE ROPE
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SIGUE A OM NOM
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Disfruta con los dibujos animados y caricaturas de Om Nom, el protagonista de la serie Cut The Rope, ¡que ya tiene su propia serie de dibujos! Suscríbete a Las Historias de Om Nom, y no te pierdas ningún capítulo de esta caricatura infantil tan adorable.

Euro 2016 is almost over, at it's been amazing!

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Plants may be stationary but they're rarely still, says biologist Roger Hangarter, creator of the website Plants in Motion. Researchers are using time-lapse photography to study the biomechanics of plant movement. For example, this week in the journal Science, physicist Sharon Gerbode, of Harvey Mudd College, and biologist Joshua Puzey, of Harvard University, explain how they used time-lapse, mathematical modelling and a prosthetic plant to understand how cucumber tendrils twist.