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Besides being hermaphrodites — all snails have both boy and girl parts — they stab each other with “love darts” as a kind of foreplay.

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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.

The sex life of the common snail is anything but ordinary.

First, they’re hermaphrodites, fitted with both male and female reproductive plumbing, and can mate with any member of their species they want.

Sounds easy, but the battle of the sexes is alive and well in gastropods.

In nature, fatherhood is easier. It’s the quickest, cheapest way to pass on your genes. Motherhood requires a much greater investment of time, energy, and resources.

During courtship, the snails will decide who gets to be more father than mother. But their idea of courtship is to stab each other with a tiny spike called a love dart.

The love dart is the snails’ tool for maximizing their male side. It injects hormones to prevent the other snail’s body from killing newly introduced sperm once copulation begins.

When snails copulate, two penises enter two vaginal tracts. Both snails in the pairing transfer sperm, but whichever snail got in the best shot with the dart has a better chance of ultimately fertilizing eggs.

In some species, only one snail fires a love dart, but in others, like the garden snail, both do.

You can spot love darts sticking out of snails in mid-courtship, and even find them abandoned in slime puddles where mating has been happening.

Scale it up to human size and the love dart would be the equivalent of a 15-inch knife.

--- How common is hermaphroditism?

Less than one percent of animal species are hermaphrodites. They’re most common among arthropods, the phylum of life that includes snails.

--- How do hermaphrodites decide who’s going to the male and female?

In most cases, both individuals will be both male and female, to some extent. Sometimes, like with garden snails, it’s a question of degree.

--- Can a love dart kill the snail?

In theory yes, but not very often. One researcher told us that in the thousands of matings he’s observed, he’s seen only one snail die that way.

---+ Read the entire article on KQED Science:

https://ww2.kqed.org/science/2....017/03/14/everything

---+ For more information:

Visit Joris Koene’s site. He’s one of the world’s foremost snail and slug researchers: http://www.joriskoene.com/

---+ More Great Deep Look episodes:

Banana Slugs: Secret of the Slime
https://www.youtube.com/watch?v=mHvCQSGanJg

The Ladybug Love-In: A Valentine's Special
https://www.youtube.com/watch?v=c-Z6xRexbIU

---+ See some great videos and documentaries from the PBS Digital Studios!

Gross Science: Help a Snail Find True Love!
https://www.youtube.com/watch?v=Vfkb2XyswJY

4 Valentine's Day Tips From the Animal World!
https://www.youtube.com/watch?v=5lMa9CYG3SU

---+ Follow KQED Science:

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

---+ 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 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. education
#deeplook

Chistes buenos para que seas el alma de las fiestas! Suscríbete aquí: https://www.youtube.com/beby

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¡Mas de 100 chistes graciosos! Esta compilación tiene más de 15 minutos de chistes para que rías con tus amigos y familia!

¡A que no sabes por qué Memín está asustado cuando se entera que su papá vió la peli de los 101 dálmatas! ¡Jajajaja! Y Memín la vuelve a liar en el cole cuando no estudia y contesta mal a una pregunta sobre las galletas. ¿Sabes qué tiene muchos cuartos? Pues según Memín es una vecindad, ¡LOL LOL LOL LOL!

Qué risa con todos estos chistes divertidos, son muy chistosos de verdad. Mamertico se come un escarabajo pensando que era un bombón ¡Qué tonto! ¿Y qué le dice una escoba a otra? ¡Te reirás mucho cuando lo sepas!

¡A que no adivinas por qué Memín hizo enfadar a su papá otra vez! Le dijo que cada día estaba más calvo, ¡Jajajajaja! Este vídeo está lleno de las ocurrencias de Memín y de muuuuchos chistes más.

Estos son TODOS los chistes de Beby del mes pasado (Abril 2017). Más de 100 chistes en total con tus personajes favoritos: Memín y su familia, Mamertico, Mamerto, Don Candelario y Rudecinda, Hugo y Valdéz. Además chistes de animales, superhéroes, policía, chistes del colegio, y muchos, muchos chistes más! ?

Si viste todos mis vídeos del mes de abril pues todos los chistes de este vídeo están repetidos pero esta es una buena forma de volver a verlos todos juntos ?. Prepárate a reir como nunca antes!

Edad recomendada: Los Chistes de Beby son aptos para toda la familia (family friendly) pero recomendamos que sean vistos por niños de 13 años en adelante para que puedan entender los temas tratados.

Los mejores chistes los cuenta Beby! XD

Música: Sneaky Snitch Kevin MacLeod (incompetech.com)
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El Pollito Pío de La Granja de Zenón y más videos infantiles | El Reino Infantil

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Sure, the female black widow has a terrible reputation. But who’s the real victim here? Her male counterpart is a total jerk — and might just be getting what he deserves.

Learn more about CuriosityStream at http://curiositystream.com/deeplook
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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.

We’ve all heard the stories. She mates and then kills. Her venom is 15 times stronger than a rattlesnake’s. One bite could kill you. With a shiny black color and a glaring red hourglass stomach, she has long inspired fear and awe.

But most species of widow spider (there are 31), including the western black widow found in the U.S., don’t kill their mates at all. Only two widow spider species always eat their mate, the Australian redback and the brown widow, an invasive species in California.

And the male seems to be asking for it. In both of these species, he offers himself to her, somersaulting into her mouth after copulation.

He may even deserve it. During peak mating season, thousands of males will prowl around looking for females. Females set up their webs, stay put and wait.

Once the male arrives at her silken abode, he starts to wreck it, systematically disassembling her web one strand at a time. In a process scientists call web reduction, he bunches it into a little ball and wraps it up with his own silk.

Then, while mating, he will wrap her in fine strands that researchers refer to as the bridal veil. He drapes his silk over her legs, where her smell receptors are most concentrated.

After all of that, he is most likely to crawl away, alive and unscathed.

--- Why does the black widow spider eat her mate?

No one really knows, but scientists assume his body supplies her with nutrition for laying eggs. Sometimes she eats him by accident, not recognizing him as a mate.

--- How harmful are black widows to people?

We couldn’t find a documented case of a human death from a black widow spider in the U.S., but a bite will make you sick with extreme flu-like symptoms. Luckily, black widows aren’t aggressive to people.

--- Why do black widows have a red hourglass?

It’s a warning sign, a phenomenon common in nature that scientists call aposematicism, which is the use of color to ward off enemies.

---+ Read the entire article on KQED Science:

https://ww2.kqed.org/science/2....018/01/09/why-the-ma
---+ For more information:

Black widow researcher Catherine Scott’s website: http://spiderbytes.org/

---+ More Great Deep Look episodes:

Why Is The Very Hungry Caterpillar So Dang Hungry?
https://www.youtube.com/watch?v=el_lPd2oFV4

Everything You Never Wanted to Know About Snail Sex
https://www.youtube.com/watch?v=UOcLaI44TXA

---+ See some great videos and documentaries from the PBS Digital Studios!

Origin of Everything: Why Does Santa Wear Red?
https://www.youtube.com/watch?v=fajNM5OPVnA

PBS Eons: 'Living Fossils' Aren't Really a Thing
https://www.youtube.com/watch?v=mPvZj2KcjAY

---+ Follow KQED Science:

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

---+ About KQED

KQED, an NPR and PBS affiliate based in San Francisco, serves the people of Northern California and beyond with a public-supported alternative to commercial media. Home to one of the most listened-to public radio station in the nation, one of the highest-rated public television services and an award-winning education program, KQED is also a leader and innovator in interactive media and technology, taking people of all ages on journeys of exploration — exposing them to new people, places and ideas.

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 #blackwidow #spiders

See NASA Astronauts Robert Behnken and Douglas Hurley launch aboard a SpaceX Falcon 9 rocket and Dragon capsule from Cape Canaveral, FL for the first manned mission from US soil in nearly a decade.

Oh my candy! Om Nom is missing! Om Nom, everyone's favorite candy-eating monster and hero of the Cut the Rope series of mobile games, has disappeared. Based on this footage, detectives say that it appears that Om Nom was swept away by either a very large bird, or, more likely, a hot air balloon. Can you help us bring him home? We need to find Om Nom in time for the launch of Cut the Rope 2. Please let us know if you see him! #omnomismissing http://cuttherope.net/cuttherope2

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Disclaimer: I own nothing, all rights belong to their respective owners. No profit is being made from this, entertainment purposes only.

Best Panna Skills Ever in Football || Most Humiliating & Best -est Nutmegs So Far in Football in Recent Times ||

My debut album ‘The Attractions Of Youth’ is OUT NOW: http://BarnsCourtney.lnk.to/TheAttractionsOfYouth

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During the highest tides, California grunion stampede out of the ocean to mate on the beach. When the party's over, thousands of tiny eggs are left stranded up in the sand. How will their lost babies make it back to the sea?

SUBSCRIBE to Deep Look! http://goo.gl/8NwXqt

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* NEW VIDEOS EVERY OTHER TUESDAY! *

With summer just around the corner, Southern California beaches are ready to welcome the yearly arrival of some very unique and amorous guests. That’s right, the grunion are running!

California grunion are fish that spend their lives in the ocean. But when the tides are at their highest during spring and summer, grunion make a trip up onto beaches to mate and lay eggs.

Grunion mate on beaches throughout southern California and down into into Mexico. The grunion runs have taken on a special importance to coastal communities Santa Barbara to San Diego.

For some, coming out to see the grunion run has been an annual tradition for generations. For others it’s a rare chance to catch ocean fish with their bare hands.

--- What are grunion?
California grunion are schooling fish similar to sardines that live in the Pacific Ocean that emerge from the sea to lay their eggs on the sand of beaches in Southern California and down the Baja California Peninsula in Mexico. There are also smaller populations in Monterey Bay and San Francisco Bay. Another species, the Gulf Grunion lays their eggs in the northern shores of the Gulf of California. California Grunion are typically about six inches in length.

--- Why do grunion mate on land?
The ocean is full of predators who would like to gobble up a tasty fish egg. The grunion eggs tend to be safer up on the beach if they can make it there without raising the attention of predators like birds and raccoons. Grunion eggs have a tough outer layer that keeps them from drying out or being crushed by the sand.

--- When do California grunion run?
California grunion typically spawn from March to August. The fishing season is closed during the peak spawning times during May and June. See https://www.wildlife.ca.gov/fi....shing/ocean/grunion# for more detailed info on grunion seasons.

---+ Read the entire article on KQED Science:
https://ww2.kqed.org/science/2....017/06/06/these-fish

---+ For more information:
http://www.grunion.org/

---+ More Great Deep Look episodes:

Sea Urchins Pull Themselves Inside Out to be Reborn | Deep Look
https://www.youtube.com/watch?v=ak2xqH5h0YY

Sticky. Stretchy. Waterproof. The Amazing Underwater Tape of the Caddisfly | Deep Look
https://www.youtube.com/watch?v=Z3BHrzDHoYo

The Amazing Life of Sand | Deep Look
https://www.youtube.com/watch?v=VkrQ9QuKprE&list=PLdKlciEDdCQDxBs0SZgTMqhszst1jqZhp&index=51

---+ See some great videos and documentaries from the PBS Digital Studios!

How Much Plastic is in the Ocean? | It's Okay To Be Smart
https://www.youtube.com/watch?v=YFZS3Vh4lfI

White Sand Beaches Are Made of Fish Poop | Gross Science
https://www.youtube.com/watch?v=1SfxgY1dIM4

What Physics Teachers Get Wrong About Tides! | Space Time
https://www.youtube.com/watch?v=pwChk4S99i4


---+ Follow KQED Science:

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

---+ About KQED

KQED, an NPR and PBS affiliate based in San Francisco, serves the people of Northern California and beyond with a public-supported alternative to commercial media. Home to one of the most listened-to public radio station in the nation, one of the highest-rated public television services and an award-winning education program, KQED is also a leader and innovator in interactive media and technology, taking people of all ages on journeys of exploration — exposing them to new people, places and ideas.

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 #grunion #grunionrun

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Composers: Franz Schubert
Artists: Martijn van den Hoek (piano), Folke Nauta (piano), Pieter van Winkel (piano)

This release contains a selection of solo piano works by Schubert. An Impromptu is such a piece, typical of the romantic era. Franz Schubert wrote eight of them. The second series of four was only published after his death. They are all available on this release. Martijn van den Hoek is the pianist. Also featured are the Moments Musicaux, performed by Folka Nauta, and 3 Klavierstücke (Impromptus aus dem Nachlass) played by Pieter van Winkel.

00:00:00 Impromptus: Impromptu in C Minor, Op. 90 No. 1: Allegro molto moderato
00:09:26 Impromptus: Impromptu in E-Flat Major, Op. 90 No. 2 : Allegro
00:13:44 Impromptus: Impromptu in G-Flat Major, Op. 90 No. 3: Andante
00:19:22 Impromptus: Impromptu in A-Flat Major, Op. 90 No. 4: Allegretto
00:27:20 Impromptus: Impromptu in F Minor, Op. 142 No. 1: Allegro moderato
00:40:08 Impromptus: Impromptu in A-Flat Major, Op. 142 No. 2: Allegretto
00:48:02 Impromptus: Impromptu in B-Flat Major, Op. 142 No. 3: Andante mit Variationen (Rosamunde)
00:59:39 Impromptus: Impromptu in F Minor, Op. 142 No. 4: Allegro vivace
01:06:21 Moments musicaux, D. 780: Moderato, in C Major
01:11:56 Moments musicaux, D. 780: Andantino, in A-Flat Major
01:18:09 Moments musicaux, D. 780: Allegretto moderato, in F Minor
01:20:17 Moments musicaux, D. 780: Moderato, in C-Sharp Minor
01:25:45 Moments musicaux, D. 780: Allegro vivace, in F Minor
01:28:02 Moments musicaux, D. 780: Allegretto, in A-Flat Major
01:36:32 3 Klavierstücke (Impromptus aus dem Nachlass), D. 946: Allegro molto, in E-Flat Minor
01:49:42 3 Klavierstücke (Impromptus aus dem Nachlass), D. 946: Allegretto, in E-Flat Major
02:00:38 3 Klavierstücke (Impromptus aus dem Nachlass), D. 946: Allegro, in C Major

Octopuses are marine animals, that live and breath underwater, so at low tide one would expect them to be imprisoned in rocky pools. This extraordinary species found in Northern Australia is like no other Octopus, and land is no obstacle when hunting for Crabs. Subscribe: http://bit.ly/BBCEarthSub

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Best Penalties Ever / Best Penalty Goals Ever in Football !!

Mix: El patito juan - Los mejores videos de Biper y sus amigos

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

Escucha el Mix del patito Juan y disfruta de la mejor musica que Biper y sus amigos tienen para ti.


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La Organización Mundial de la Salud advierte que muchos están aprovechando el miedo del coronavirus para esparcir informaciones erróneas e incluso lucrar con productos contra la epidemia.

Jaime Duarte, Director del Centro de Investigaciones sobre la Nueva Era