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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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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
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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 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

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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TODOS LOS GOLES QUE SE ERRÓ ARGENTINA CON MESSI ||

The Worst Misses Ever in Football by the Worst Team-mates Ever in Football History ||

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Please read the Description Box/Info Box before writing anything.
Spoiler alert!!

I only record these games for Entertainment Purposes, for myself, friends and other people that have interest for the videos. I never record the video to show off my gaming skill; I'm just showing of the games. I'm not doing guides to teach anyone how to play a game. None of my video suppose to be one either unless it stated otherwise! Read before you write any complain! Talk about the game however you want, but insult that are directed to me will be remove!

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.: Info about this Video :.

English Title: Kung Fu Panda
Platform: Microsoft Windows 7, Wii, PlayStation 3, PlayStation 2, Xbox 360, Nintendo DS
Played on: PlayStation 3
Developer: Luxoflux (PlayStation 3, Xbox 360); Beenox (PC); XPEC Entertainment (Wii, PlayStation 2); Vicarious Visions (Nintendo DS)
Publisher: Activision
Genre(s): Action-adventure
Mode(s): Single-player, multiplayer

The game revolves around Po, a giant panda who dreams of becoming a great kung fu fighter. Unfortunately his weight and clumsiness makes this ambition seemingly unattainable. However, soon he finds himself going on a journey to save the land from an evil snow leopard named Tai Lung. But also joining the fray are the forces of the Great Gorilla, Tai Lung and the Wu Sisters' wolves, the Boar Gang, Imperial Golden Croc Gang and the Lang Shadow Army, bent on capturing the Jade Palace's treasures. Also, unlike the film, the Furious Five are captured by various gangs only to be saved by Po.

Recording Device use to record this video:
- AVerTV DarkCrystal HD Capture Station C874

"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."

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

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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A cada passo da jornada, Po se torna mais forte, mais sábio e mais preparado para seguir seu destino como Dragão Guerreiro. Agora, perto do Palácio, ele terá que mais uma vez enfrentar fortes inimigos e trabalhar em equipe para atingir seu objetivo. Vamos apertar start?

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El Pollito Pío de La Granja de Zenón y más videos infantiles | El Reino Infantil

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Cantan los pollitos "El pollito pío"
Hiporopopó
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El baile del cocodrilo
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Pausa publi
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Con la A, A, A

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US astronaut Christina Koch returned to Earth on February 6, 2020, after shattering the space flight record for female astronauts with a stay of almost 11 months aboard the International Space Station. The 41-year-old engineer touched down with two other astronauts in Kazakhstan after spending 328 days on her mission which involved more than 210 investigations to collect data for future missions to the moon and Mars.

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I found this pretty weird I just wanted to share this with everyone and I would love an explanation on what it is I'm guessing Shrek? Looks like it

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

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¡Diviértete cantando al ritmo de Bebé Tiburón Doo Doo Doo! ¡Canta y dinos quien es tu personaje favorito de la Familia Tiburón! #littleangel #littleangelespañol

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¡Ve a tu canción favorita haciendo click en el título del video!
00:04 Bebé Tiburón Doo Doo
02:05 Itsy Bitsy Araña
04:13 Somos las Princesas
05:52 Señor Sol
08:28 María tenía un Corderito
10:02 La Patrulla Canina Jugando Peekaboo
11:27 ¿Manzanas o Plátanos?
13:36 Los Cinco Patitos

Las canciones de Little Angel divierten, entretienen y cantan mientras a los niños aprenden nuevo vocabulario, y otros aspectos básicos de su vida cotidiana.

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Nursery rhymes and kids songs, músicas para crianças, música infantil, canciones para niños, अंग्रेजी में बच्चों के गाने, детские песни для детей, comptines en espagnol, bata kanta sa ingles, lagu kanak-kanak Inggeris, lagu anak-anak dalam bahasa inggris, أغاني الأطفال باللغة الإنجليزية, 兒童歌曲英文.

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¿Te gustan las Princesas? ¡Entonces te va a encantar este video! Conoce a La Reina de la Nieve y canta y baila junto a todas las princesas de Disney en Somos las Princesas y Las Princesas Cantan Así. #littleangel #littleangelespañol

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00:04 La Reina de la Nieve
01:17 Somos las Princesas
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05:06 Cinco Gatitos
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08:35 Las Princesas Cantan Así
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12:22 Brilla Brilla Estrellita

Nuestras canciones para niños enseñan habilidades básicas y mejoran su habilidad para comprender y seguir instrucciones. Las canciones infantiles aceleran las capacidades fonéticas y mejoran la comprensión oral, de lectura y escritura.

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Nursery rhymes and kids songs, músicas para crianças, música infantil, canciones para niños, अंग्रेजी में बच्चों के गाने, детские песни для детей, comptines en espagnol, bata kanta sa ingles, lagu kanak-kanak Inggeris, lagu anak-anak dalam bahasa inggris, أغاني الأطفال باللغة الإنجليزية, 兒童歌曲英文.

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

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?

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

* 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

There are strange little towers on the forest floor. Neat, right? Nope. Inside hides a spider that's cunning, patient and ruthless.

SUBSCRIBE to Deep Look! http://goo.gl/8NwXqt
Please follow us on Patreon! https://www.patreon.com/deeplook

DEEP LOOK is a 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.

Most Bay Area hikers pass right by without ever noticing, but a careful eye can spot tiny towers rising up from the forest floor. These mysterious little tubes, barely an inch high, are the homes of a particularly sneaky predator -- the California turret spider.

“To me, the turrets look just like the rook in a chess set,” said Trent Pearce, a naturalist for the East Bay Regional Park District, as he scanned the terrain at Briones Regional Park. “The spiders themselves are super burly – like a tiny tarantula the size of your pinky nail.”

Turret spiders build their towers along creek beds and under fallen trees in forested areas throughout Central and Northern California. They use whatever mud, moss, bark and leaves they can find nearby, making their turrets extremely well camouflaged.

They line the inside of their tiny castles with pearly white silk, which makes the structure supple and resilient

Each turret leads down to a burrow that can extend six inches underground. The spiders spend their days down there in the dark, protected from the sun and predators.

As night falls, they climb up to the entrance of the turrets to wait for unsuspecting prey like beetles to happen by.

Turret spiders are ambush hunters. While remaining hidden inside their turret, they’re able to sense the vibrations created by their prey’s footsteps.

That’s when the turret spider strikes, busting out of the hollow tower like an eight legged jack-in-the-box. With lightning speed the spider swings its fangs down like daggers, injecting venom into its prey before dragging it down into the burrow.

“It’s like the scene in a horror movie where the monster appears out of nowhere – you can’t not jump,” Pearce said.

--- What do turret spiders eat?
Turret spiders mostly ground-dwelling arthropods like beetles but they will also attack flying insects like moths that happen to land near their turrets.

--- Are turret spiders dangerous to people?
Turret spiders are nocturnal so it’s rare for them to interact with humans by accident. They tend to retreat into their underground burrow if they feel the vibrations of human footsteps. They do have fangs and venom but are not generally considered to be dangerous compared to other spiders. If you leave them alone, you shouldn’t have anything to fear from turret spiders.

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

https://ww2.kqed.org/science/2....019/01/15/turret-spi

---+ For more information:

Learn to Look for Them, and California’s Unique “Turret Spiders” are Everywhere
https://baynature.org/article/....and-this-little-spid

---+ More Great Deep Look episodes:

For These Tiny Spiders, It's Sing or Get Served | Deep Look
https://youtu.be/y7qMqAgCqME

Praying Mantis Love is Waaay Weirder Than You Think | Deep Look
https://youtu.be/EHo_9wnnUTE

Why the Male Black Widow is a Real Home Wrecker | Deep Look
https://youtu.be/NpJNeGqExrc

---+ Follow KQED Science and Deep Look:

Instagram: https://www.instagram.com/kqedscience/
Twitter: https://www.twitter.com/kqedscience
KQED Science on kqed.org: http://www.kqed.org/science
Facebook Watch: https://www.facebook.com/DeepLookPBS/
Patreon: https://www.patreon.com/deeplook

---+ Shoutout!

Congratulations to ?Iset4, MidKnight Fall7,
jon pomeroy, Justin Felder3, and DrowsyTaurus26?, who were the first to correctly ID the species of spider in our episode - Antrodiaetus riversi (also known as Atypoides riversi) over at the Deep Look Community Tab:

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

(hat tip to Edison Lewis10 for posting the entire family tree!)

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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.

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Answer video: https://www.youtube.com/watch?v=BickMFHAZR0
The longest vertical straw you can use is 10.3 m http://www.youtube.com/watch?v=HUmZrtiXDik
This is because the weight of water in the straw must be supported by the pressure difference at its two ends. At the bottom, the pressure is atmospheric, and at the top, the lowest pressure you can create is a perfect vacuum (pressure = 0). Atmospheric pressure can support a water column about 10m high - BUT with 0 pressure at the top, the water would start boiling. This is called cavitation and it obviously can't be happening in trees.
After I posted the straw video, I received a lot of questions about how trees could be taler than 10m. I assumed there was a simple answer because there are plenty of trees taller than that. But as I asked around and read articles about it, I couldn't really find an explanation I was happy with.

Maybe there is not a continuous water column inside the tree, so each section only lifts water a little ways? This could be but it seems to require a series of pump mechanisms, and how would you join this pump sections together? Perhaps capillary action is holding the water up? But the xylem tubes in a tree seem too wide (~50 um) for this effect to be significant. Maybe osmotic pressure could push the water from below rather than sucking it up from above? But some trees live in mangroves, where there is much higher solute concentration in the sea water than in their roots, so osmosis would work the other way.

Eventually I spoke to a plant biologist and sorted this all out, but I wanted to give you a little back to school challenge. How do you think this could work?