When it comes to spotting prey, sharks and rays have a secret sense beyond sight and smell. Tiny goo-filled organs called Ampullae of Lorenzini detect the invisible electric fields produced by all living creatures.

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.

How do Sharks and Rays Sense Electric Fields?

Most animals don’t have the ability to detect electric fields. But sharks, rays, skates and sawfish — members of a group called Elasmobranchii — are masters of detecting electric signals. It’s one of their defining features. Elasmobranchs have specialized organs called Ampullae of Lorenzini. These tiny structures allow them to home in on weak bioelectric fields generated by nearby prey.

Elasmobranch’s electrosensory organs are named after a 17th century Italian physician, Stefano Lorenzini, who first identified them while dissecting an electric ray. Lorenzini noticed dozens of tiny pores around the animal’s mouth. Each of the pores led to jelly-filled canals that ended in pocket-like structures that he called ampullae, the Latin word for a type of round-bottomed flask.

Animals emit low frequency electric fields due to a process known as osmoregulation. This process allows the concentration of ions (charged atoms or molecules) to flow between the inside of our bodies and the outside. In order for our cells to stay intact, the flow of ions needs to be balanced.

But balanced doesn’t necessarily mean equal. The concentration of ions within a shrimp’s body is much lower than that of the sea water it swims in. Their voltage, or potential difference generated between the two concentrations across “leaky” surfaces, can then be detected by the ampullae.


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---

Read the article for this video on KQED Science:
http://ww2.kqed.org/science/2015/08/11/sharks-and-rays-sense-electricity-fish-cant-hide/
#deeplook

Elena Rivera Villajos, (Zaragoza, Aragón) es una actriz y cantante española conocida por su interpretación del papel de «Karina» en la serie de televisión Cuéntame cómo pasó.

Support Deep Look on Patreon! https://www.patreon.com/deeplook

Yep, brown marmorated stink bugs are stinky, but that’s not the worst thing about them. They're imported agricultural pests eating their way across North America. But a native enemy from Asia – the tiny samurai wasp – has a particularly nasty method of stopping stink bugs in their tracks.

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DEEP LOOK is an 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. Explore big scientific mysteries by going incredibly small.

---

It looks rather harmless at first glance. With a speckled exterior and a shield-like shape, the brown marmorated stink bug doesn’t appear to be any different from any other six-legged insect that might pop up in your garden. But this particular bug, which arrived in the U.S. from Asia in the mid-1990s and smells like old socks when it is squashed, is a real nuisance. Not only can it invade homes by the thousands in the wintertime, it’s one formidable agricultural pest, eating millions of dollars of peaches, apples and other crops since 2010.

Scientists are now investigating a new tactic in the war on the stink bugs: the possibility of relying on one of the bug’s natural enemies, the samurai wasp.

Also native to Asia, this parasitic wasp keeps the stink bug population in check there. How?

---+ Read the entire article on KQED Science:
https://www.kqed.org/science/1....937639/samurai-wasps

---+ For more information:

Brown Marmorated Stink Bug Research at Oregon State University
http://bit.ly/2GB8RFs

---+ More Great Deep Look episodes:

These Hairworms Eat a Cricket Alive and Control Its Mind
https://youtu.be/YB6O7jS_VBM

Jerusalem Crickets Only Date Drummers
https://youtu.be/mHbwC-AIyTE

Turret Spiders Launch Sneak Attacks From Tiny Towers
https://youtu.be/9bEjYunwByw

---+ Shoutout!

?Congratulations ?to bujur10514, Ace _YT13, Iridescent Moonbeam, Salina Tran, and Noke Noke over at the Deep Look Community Tab, for correctly identifying the term 'Thigmotaxis:'

https://www.youtube.com/channe....l/UC-3SbfTPJsL8fJAPK


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Bill Cass, Justin Bull, Daniel Weinstein, David Deshpande, Daisuke Goto, Karen Reynolds, Yidan Sun, Elizabeth Ann Ditz, KW, Shirley Washburn, Tanya Finch, johanna reis, Shelley Pearson Cranshaw, Johnnyonnyful, Levi Cai, Jeanine Womble, Michael Mieczkowski, SueEllen McCann, TierZoo, James Tarraga, Willy Nursalim, Aurora Mitchell, Marjorie D Miller, Joao Ascensao, PM Daeley, Two Box Fish, Tatianna Bartlett, Monica Albe, Jason Buberel

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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. Deep Look is a project of KQED Science, which is also supported by the National Science Foundation, the Templeton Religion Trust, the Templeton World Charity Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Fuhs Family Foundation and the members of KQED. #deeplook #stinkbugs #wildlife

New Season 5 of Om Nom Stories is here! Join Om Nom in the amazing journey around the world & try to guess the country in this episode!

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Ants don’t eat leaves. They use them to grow white tufts of nutritious fungus to feed their offspring. Their success as farmers has made leafcutter ants into fungus tycoons, complete with their own underground cities and huge half-inch soldiers to patrol them.

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.

What do ants eat?

Though leafcutter ants drink the sap in leaves for energy, they don’t eat them. Instead, they use them to grow something else. Leafcutters use leaf pieces to feed a fungus that grows in white tufts in their nests. The ants eat the fungus and feed it to their brood.

How old are ants?

To give you an idea, while humans have farmed for around 12,000 years, ants have been doing it for 60 million.

How many ants are there in the world?

If you bundled together all the ants in the world, there would be more of them than people – they’re the dominant biomass, says Brian Fisher, chair of the Department of Entomology at the California Academy of Sciences, in San Francisco. This is because all 30,000 species of ants are social. They have many ways of making a living.

How strong are ants?

Leafcutter ants haul leaf pieces through fields or forests to their underground nests. For a human, this feat would be the equivalent of carrying more than 600 pounds between our teeth.

Why are ants important to the soil?

The activity of ants aerates the soil, making it easier for water and oxygen to get through. They also contribute organic matter.

More great Deep Look episodes:

What Happens When You Put a Hummingbird in a Wind Tunnel?
https://www.youtube.com/watch?v=JyqY64ovjfY

Newt Sex: Buff Males! Writhing Females! Cannibalism!
https://www.youtube.com/watch?v=5m37QR_4XNY

Pygmy Seahorses: Masters of Camouflage
https://www.youtube.com/watch?v=Q3CtGoqz3ww

See also another great video from the PBS Digital Studios!

It's Okay to Be Smart: What's The Most Successful Species on Earth?
https://www.youtube.com/watch?v=fWc46NCnldo

And this one is also a favorite:

How to get Ants to carry a sign - Smarter Every Day 92
https://www.youtube.com/watch?v=-ZZzcw9ifDQ

Read an extended article on how leafcutter ants grow a fungus from leaf pieces:

http://ww2.kqed.org/science/20....15/06/11/where-are-t

If you’re in the San Francisco Bay Area, you can see live leafcutters at the Oakland Zoo or the California Academy of Sciences, in San Francisco.

http://www.oaklandzoo.org
http://www.calacademy.org

The compact book “The Leafcutter Ants: Civilization by Instinct,” by Bert Hölldobler and Edward O. Wilson, has detailed black and white drawings, photos and a fascinating description of the mating habits of leafcutter ant queens. The queen accumulates all the sperm she’ll need for her entire reproductive life during a single mating frenzy. After that, males are no longer necessary: Leafcutter colonies are made up entirely of female ants.

KQED Science: http://ww2.kqed.org/science
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Twitter: https://www.twitter.com/kqedscience

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 supported by HopeLab, The David B. Gold Foundation; S. D. Bechtel, Jr. Foundation; The Dirk and Charlene Kabcenell Foundation; The Vadasz Family Foundation; Smart Family Foundation and the members of KQED.
#deeplook

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En este video, el profesor y orientador Juan de Vicente nos explica qué es el Aprendizaje Servicio. Un método educativo que conecta los conocimientos aprendidos por los alumnos en las aulas con la prestación de servicios solidarios para mejorar su comunidad: su barrio, su ciudad… En esta conversación con representantes de instituciones y colectivos locales que han participado en proyectos de Aprendizaje Servicio (APS), el orientador explica esta metodología con ejemplos cotidianos como la organización de un maratón solidario para fomentar la donación de sangre que además sirve para explicar el sistema cardiovascular, la creación de huertos urbanos comunitarios que explican fundamentos de Ciencias Naturales, los proyectos intergeneracionales con personas mayores, etcétera.

Juan de Vicente Abad es orientador y profesor en el Instituto público IES Miguel Catalán de Coslada, Madrid. Ganador del Premio al Docente más Innovador de España en el Certamen D+I (2016), es uno de los grandes referentes en la aplicación de la metodología educativa conocida como Aprendizaje y Servicio Solidario (APS). Además es un experto en la resolución de conflictos, la convivencia escolar y la interculturalidad.

"El Aprendizaje Servicio motiva a los jóvenes, aporta sentido a las asignaturas que se imparten en aula y les convierte en agentes de cambio social”, afirma Juan de Vicente

#AprendemosJuntos

I used a nitrogen membrane and Stirling cryocooler to liquefy nitrogen out of the air. For this video I partnered with Starbucks to celebrate their Nitro Cold Brew. Order one here: https://starbucks.app.link/derekmuller

Making liquid nitrogen is hard - in fact up until 150 years ago scientists doubted whether it was even possible to liquefy nitrogen. In 1823, At the royal institution in London, Michael Faraday first produced liquid chlorine, kind of accidentally by putting it under high pressure. He similarly liquefied ammonia.

Borrowing a mixture from Thilorier in France, a combination of dry ice, snow and ether, he reached a temperature of -110C. By 1845 he used this mixture plus a hand pump to pressurize gases to liquefy all the known gases except six, which included oxygen and nitrogen. These became known as the “permanent” gases.

A French Physicist Aimé compressed oxygen and nitrogen in tanks and then lowered them into the ocean over 1.6km deep, where the pressure got up to 200 atmospheres. Still the gases didn’t liquefy.

Only at the end of 1877 were the first droplets of liquid oxygen and liquid nitrogen produced, by Cailletet in France. He first tried oxygen by compressing it up to 300 atmospheres, cooled to -30C, but that wasn't even enough to liquefy oxygen. But when he suddenly released the pressure, the expanding gas cooled, he estimated to -200C and he saw a mist and then droplets slide down the walls of his vessel.

It's amazing how far we've come in that now I can purchase a helium-based cryocooler. It compresses and expands the gas to absorb heat from the tip of the cold finger and eject it into the surroundings at ambient temperature.

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In the following video, Wagner states that the true challenge is for children to have real options, that they can experiment and collaborate with each other. "Being prepared for the age of innovation requires that children learn to work collaboratively, that they learn to think critically, learn to communicate effectively, and how to solve problems creatively." As an educator, Wagner asks why we continue to inculcate in children that everyone has to study higher education, when many people do not have, or need a university degree. "You have to prepare young people to be active and informed citizens," the researcher concludes.



#AprendemosJuntos

LAS ESTRELLAS MAS PODEROSAS VS GIGANTES CONGELADOS ? BEBE MILO PLANTAS VS ZOMBIES 2

? SUSCRIBETE A BEBEMILO AQUÍ: https://goo.gl/mDu2Ad
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✅ Canales de los AMIWITOS
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======================================================

? MIS LISTAS DE REPRODUCCIÓN
✅ LO MEJOR de BEBE MILO y sus AMIGOS: https://goo.gl/9MgnWZ
✅ BEBE MILO AVENTURAS: https://goo.gl/VQhwNq
✅ LAS AVENTURAS DEL NOOB: https://goo.gl/gP8lwG
✅ CANCIONES DE BEBE MILO: https://goo.gl/swgdwg
✅ EL ESCONDITE: https://goo.gl/45L2yT
✅ ISLA VS ISLA: https://goo.gl/euAmDc
✅ BEBE MILO DIMENSIONES: https://goo.gl/rHVcU2

======================================================

El canal de Bebe milo es para publico infantil. Podrás encontrar canciones infantiles, música infantil para niños y niñas, chicos y chicas. También podrás ver jugar juegos como minecraft gratis, roleplay muy entretenido y en español latino, roblox y mucho mas.
Lo importante es divertirse y tener lo mejor de minecraft para bebes en 2018!

Dive into amazing adventures with new characters from Cut the Rope: Magic! In this episode, Om Nom arrives at what appears to be a friendly house, until someone ruins the cozy atmosphere...

To enter the giveaway and get a chance to win super-cute Cut the Rope: Magic magnets (http://on.fb.me/1SQDA0E), just do the following:
- find the hidden object from the end of the video and write in the comments below where you have found it;
- like this video;
- subscribe to our channel if you haven't done so yet;

The winner will be chosen randomly from all those who meet the conditions above. We will announce the winner in the next episode of Om Nom Stories. Don't miss it!

THE WINNER OF THE PREVIOUS WEEK IS... Tod King!

Congratulations! Please leave a private message on the "About" page of our channel (https://www.youtube.com/user/ZeptoLab/about) with your full contact details so we can send you the prize.

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BARCO del GRINCH VS BARCO de NAVIDAD ⛴️ BEBE MILO MINI JUEGO MINECRAFT

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✅ Canales de los AMIWITOS
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#BEBEMILO #JUEGOS #DIVERSION

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======================================================

? MIS LISTAS DE REPRODUCCIÓN
✅ LO MEJOR de BEBE MILO y sus AMIGOS: https://goo.gl/9MgnWZ
✅ BEBE MILO AVENTURAS: https://goo.gl/VQhwNq
✅ LAS AVENTURAS DEL NOOB: https://goo.gl/gP8lwG
✅ CANCIONES DE BEBE MILO: https://goo.gl/swgdwg
✅ EL ESCONDITE: https://goo.gl/45L2yT
✅ ISLA VS ISLA: https://goo.gl/euAmDc
✅ BEBE MILO DIMENSIONES: https://goo.gl/rHVcU2

======================================================

El canal de Bebe milo es para publico infantil. Podrás encontrar canciones infantiles, música infantil para niños y niñas, chicos y chicas. También podrás ver jugar juegos como minecraft gratis, roleplay muy entretenido y en español latino, roblox y mucho mas.
Lo importante es divertirse y tener lo mejor de minecraft para bebes en 2018!

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Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use

BEBE MILO RECIBE REGALOS DE NAVIDAD MUY CHISTOSOS ? MINECRAFT DF PLASTILINA HUMAN FALL

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#BEBEMILO #JUEGOS #DIVERSION

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======================================================

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✅ LAS AVENTURAS DEL NOOB: https://goo.gl/gP8lwG
✅ CANCIONES DE BEBE MILO: https://goo.gl/swgdwg
✅ EL ESCONDITE: https://goo.gl/45L2yT
✅ ISLA VS ISLA: https://goo.gl/euAmDc
✅ BEBE MILO DIMENSIONES: https://goo.gl/rHVcU2

======================================================

El canal de Bebe milo es para publico infantil. Podrás encontrar canciones infantiles, música infantil para niños y niñas, chicos y chicas. También podrás ver jugar juegos como minecraft gratis, roleplay muy entretenido y en español latino, roblox y mucho mas.
Lo importante es divertirse y tener lo mejor de minecraft para bebes en 2018!

New Season 5 of Om Nom Stories is here! Join Om Nom in the amazing journey around the world & try to guess the country in this episode!

Get the latest Cut the Rope: Magic game for iOS, Android & Amazon: http://zep.tl/ctrmagicfb

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One day, a programmer from ZeptoLab made a prototype version of Cut the Rope for Google Glass. Just for fun. We gave it to a bunch of people around the office. It resulted in this...

A trip to #Mars involves radiation, muscle and bone loss, intermediate axis theorem and liquids.
Check out Mars on National Geographic, Monday Nov 12 at 9/8c
#sponsored

When I got offered the chance to fly in another #zeroG plane, I jumped at the chance. Do you know how hard it is when you are thrust into low-gravity, like the 37% of Earth's gravity of Mars, and you have to remember what you were going to say in a 30 second window as blood floods your head? It's pretty hard. It would be even harder to actually travel to Mars. It would take about 8 months in microgravity during which time your muscles and bones would weaken substantially, even if you exercise for hours a day like the astronauts on the space station. And your heart is a muscle too so it weakens as well. Before I contemplated these rates of muscle and bone loss, I thought the major challenge with a round trip journey to Mars would be the logistics of spacecraft and having enough fuel to get back. But with the weakening of the human body, it's an open question whether anyone would really want to come back.

Filmed by Steve Boxall

Music from Epidemic Sound: http://epidemicsound.com

For humans to travel to the Moon and Mars, they'll need a companion - a lowly weed. Just as Matt Damon survives on Mars in The Martian because he cultivates plants in the red planet's hostile conditions, astronauts will need to understand how to grow plants in extreme climates. Dr. Anna-Lisa Paul and Dr. Robert J. Ferl at the University of Florida, Gainesville Space Plants Lab, put weeds in unique situations - like sending them to the International Space Station - to study their behavior on a molecular level. Their research could pave the way for growing plants in extreme climates on Earth, the Moon, long-term space travel, and even Mars.

Recuento de Nuestra visita al congreso unido en la fe, del sembrador
agosto 16 y 17 los angeles sport arena,C.A

VIITA DE ALFAREROS A GUATEMALA JUNIO 2008

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Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use