These are the molecular machines inside your body that make cell division possible. Animation by Drew Berry at the Walter and Eliza Hall Institute of Medical Research. http://wehi.tv

Special thanks to Patreon supporters:
Joshua Abenir, Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen

Support Veritasium on Patreon: http://ve42.co/patreon

Every day in an adult human roughly 50-70 billion of your cells die. They may be damaged, stressed, or just plain old - this is normal, in fact it’s called programmed cell death.

To make up for that loss, right now, inside your body, billions of cells are dividing, creating new cells.

And cell division, also called mitosis, requires an army of tiny molecular machines.DNA is a good place to start - the double helix molecule that we always talk about.

This is a scientifically accurate depiction of DNA. If you unwind the two strands you can see that each has a sugar phosphate backbone connected to the sequence of nucleic acid base pairs, known by the letters A,T,G, and C.

Now the strands run in opposite directions, which is important when you go to copy DNA. Copying DNA is one of the first steps in cell division. Here the two strands of DNA are being unwound and separated by the tiny blue molecular machine called helicase.
It literally spins as fast as a jet engine! The strand of DNA on the right has its complimentary strand assembled continuously but the other strand is more complicated because it runs in the opposite direction.
So it must be looped out with its compliment strand assembled in reverse, section by section. At the end of this process you have two identical DNA molecules, each one a few centimeters long but just a couple nanometers wide.

To prevent the DNA from becoming a tangled mess, it is wrapped around proteins called a histones, forming a nucleosome.
These nucleosomes are bundled together into a fiber known as chromatin, which is further looped and coiled to form a chromosome, one of the largest molecular structures in your body.
You can actually see chromosomes under a microscope in dividing cells - only then do they take on their characteristic shape.

The process of dividing the cell takes around an hour in mammals. This footage is from a time lapse. You can see how the chromosomes line up on the equator of the cell. When everything is right they are pulled apart into the two new daughter cells, each one containing an identical copy of DNA.
As simple as it looks, this process is incredibly complicated and requires even more fascinating molecular machines to accomplish it. Let’s look at a single chromosome. One chromosome consists of two sausage-shaped chromatids - containing the identical copies of DNA made earlier. Each chromatid is attached to microtubule fibers, which guide and help align them in the correct position. The microtubules are connected to the chromatid at the kinetochore, here colored red.
The kinetochore consists of hundreds of proteins working together to achieve multiple objectives - it’s one of the most sophisticated molecular mechanisms inside your body. The kinetochore is central to the successful separation of the chromatids. It creates a dynamic connection between the chromosome and the microtubules. For a reason no one’s yet been able to figure out, the microtubules are constantly being built at one end and deconstructed at the other.
While the chromosome is still getting ready, the kinetochore sends out a chemical stop signal to the rest of the cell, shown here by the red molecules, basically saying this chromosome is not yet ready to divide
The kinetochore also mechanically senses tension. When the tension is just right and the position and attachment are correct all the proteins get ready, shown here by turning green.
At this point the stop signal broadcasting system is not switched off. Instead it is literally carried away from the kinetochore down the microtubules by a dynein motor. This is really what it looks like. It has long ‘legs’ so it can avoid obstacles and step over the kinesins, molecular motors walking the other direction.

Studio filming by Raquel Nuno

"Full Moon" est extrait de l'album "Full Moon Story" Cette musique date de l'année 1979, mais dans mon coeur, elle n'a pris aucune ride....

Provided to YouTube by WM UK

Athair Ar Neamh (2009 Remaster) · Enya

The Very Best of Enya

℗ 2009 Warner Music UK Ltd

Mastering Engineer: Arun Chakraverty
Cello, Keyboards, Percussion, Piano, Synthesizer, Violin, Vocals: Enya
Arranger, Engineer, Producer: Nicky Ryan
Mixing Engineer: Nicky Ryan
Engineer: Nicky Ryan
Executive Producer: Rob Dickins
Writer: Enya
Writer: Roma Ryan

Auto-generated by YouTube.

Compliant mechanisms have lots of advantages over traditional devices. SimpliSafe is awesome security. It's really effective, easy to use, and the price is great. Check out SimpliSafe here: https://simplisafe.com/veritasium

I visited the Compliant Mechanisms Research group at Brigham Young University and spoke to Professor Larry Howell:
https://www.compliantmechanisms.byu.edu

At the above link, you can download 3D-print files to make some of the objects in the video, plus learn more about compliant mechanisms.

What I learned about compliant mechanisms I summarize in the 8 P's of compliant mechanisms:

1. Part count (reduced by having flexible parts instead of springs, hinges)
2. Productions processes (many, new, different enabled by compliant designs)
3. Price (reduced by fewer parts and different production processes)
4. Precise Motion (no backlash, less wear, friction)
5. Performance (no outgassing, doesn't require lubricant)
6. Proportions (reduced through different production processes)
7. Portability (lightweight due to simpler, reduced part count designs)
8. Predictability (devices are reliable over a long period of time)

Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd

Animation by Alan Chamberlain

Remarkably little is known about great white sharks, but they are similar to humans in a lot of ways - they give birth to live young, maintain a higher body temperature than their surroundings and they are apex predators. There are also many misconceptions about these sharks: people think they don't get cancer and that they reside mainly in shallow waters near beaches. In this video I summarize some of the most interesting things I learned about sharks on my cage diving adventure.

Special thanks to Rodney Fox Shark Expeditions for making this trip possible: http://bit.ly/rodneyfox

Thanks also to Tourism South Australia for facilitating the trip: http://bit.ly/1aq9MgV

Chris Cassella or C² as he is known after this trip was a shark spotter extraordinaire. He also took some of the best shark footage in this video. It was his idea to go on this expedition, which was definitely a once in a lifetime experience, so I am in his debt. Chris, I look forward to going on more great adventures with you. Check out Chris's facebook page ScienceAlert http://on.fb.me/18nhyLp

NEW CHANNEL! http://youtube.com/sciencium

For a long time we thought the Moon was completely dry, but it turns out there are actually three sources of lunar water.
Thanks to Google Making and Science for supporting the new channel! http://youtube.com/makingscience

Thanks to Patreon supporters:
Nathan Hansen, Donal Botkin, Tony Fadell, Zach Mueller, Ron Neal

Support Veritasium on Patreon: http://bit.ly/VePatreon

References:
Great history of water on the moon: https://arxiv.org/pdf/1205.5597.pdf

Filmed by Raquel Nuno

Music from http://epidemicsound.com "Serene Story 2"

Chaos theory means deterministic systems can be unpredictable. Thanks to LastPass for sponsoring this video. Click here to start using LastPass: https://ve42.co/VeLP
Animations by Prof. Robert Ghrist: https://ve42.co/Ghrist

Want to know more about chaos theory and non-linear dynamical systems? Check out: https://ve42.co/chaos-math

Butterfly footage courtesy of Phil Torres and The Jungle Diaries: https://ve42.co/monarch
Solar system, 3-body and printout animations by Jonny Hyman
Some animations made with Universe Sandbox: https://universesandbox.com/
Special thanks to Prof. Mason Porter at UCLA who I interviewed for this video.

I have long wanted to make a video about chaos, ever since reading James Gleick's fantastic book, Chaos. I hope this video gives an idea of phase space - a picture of dynamical systems in which each point completely represents the state of the system. For a pendulum, phase space is only 2-dimensional and you can get orbits (in the case of an undamped pendulum) or an inward spiral (in the case of a pendulum with friction). For the Lorenz equations we need three dimensions to show the phase space. The attractor you find for these equations is said to be strange and chaotic because there is no loop, only infinite curves that never intersect. This explains why the motion is so unpredictable - two different initial conditions that are very close together can end up arbitrarily far apart.

Music from https://epidemicsound.com "The Longest Rest" "A Sound Foundation" "Seaweed"

We also made a video about laser cooling! http://bit.ly/PhysGirl
Check out Audible: http://bit.ly/AudibleVe
Check out Beyond Slow Motion: http://bit.ly/VeBeyondSlowMo
More on this topic: http://wke.lt/w/s/ef3eV

Special thanks to Laser Away in Santa Monica for helping make this happen - your staff was awesome! http://bit.ly/VeLaserAway

Research and filming by Raquel Nuno and Aaron White.

Direct from America's space program to YouTube, watch NASA TV live streaming here to get the latest from our exploration of the universe and learn how we discover our home planet.

NASA TV airs a variety of regularly scheduled, pre-recorded educational and public relations programming 24 hours a day on its various channels. The network also provides an array of live programming, such as 24-hour coverage of missions, events (spacewalks, media interviews, educational broadcasts), press conferences and rocket launches.

In the United States, NASA Television's Public and Media channels are MPEG-2 digital C-band signals carried by QPSK/DVB-S modulation on satellite AMC-3, transponder 15C, at 87 degrees west longitude. Downlink frequency is 4000 MHz, horizontal polarization, with a data rate of 38.86 Mhz, symbol rate of 28.1115 Ms/s, and ¾ FEC. A Digital Video Broadcast (DVB) compliant Integrated Receiver Decoder (IRD) is needed for reception.

Samuel Hernández ha llegado a muchos lugares con la alabanza Levanto mis manos.
Ha sido muchas las visitas que ha realizado con su guitarra en mano, llegando a donde realmente esta la necesidad. Este es el verdadeero evangelio, llevar vida, alegría, restauración a los mas que lo necesitan, a Dios sea la Gloria. En esta ocasión la actriz muy conocida en Puerto Rico, Judith Pizarro recibe una Inyección de Fe, Levantó sus manos, recibió fuerzas nuevas, meses después partió con el Señor, no sin antes haberlo aceptado como único y exclusivo Salvador.

00:00 | 01 - Mi vida está llena de ti.
04:22 | 02 - Creyendo en ti.
08:23 | 03 - Un canto de esperanza.
13:41 | 04 - Actualidad.
18:17 | 05 - Gracias quiero darte.
23:10 | 06 - Nada me apartará de ti, Señor.
27:54 | 07 - Tengo vida nueva.
32:04 | 08 - Te alabamos.

Más música cristiana: https://www.youtube.com/FeCristianismo.

D. R. © 2004 Este video ha sido monetizado por el propietario de los derechos de autor, quien recibe los ingresos por concepto de publicidad.

Pues, este es mi primer vídeo y espero que les guste.
Para todos aquellos que con esta canción se identifican.

Creditos : WERLIFE.COM

Espero Que le guste esta canción de Jaci Velasquez de la producción Mi Corazón

jaci velasquez talking about como se cura una herida hit single live guatemala

Watch as monkeys, guanacos and kangaroos all go head-to-head in our greatest animal fights! For family or territory, these determined animals won't go down without a fight.
Subscribe: http://bit.ly/BBCEarthSub

#GreatestAnimalFights #AnimalFightsCompilation #BBCEarth

Watch more:
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
Planet Earth II http://bit.ly/PlanetEarthIIPlaylist
Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

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.

Want to share your views with the team? Join our BBC Studios Voice: https://www.bbcstudiosvoice.com/register

This is a page from BBC Studios who help fund new BBC programmes. Service information and feedback: http://bbcworldwide.com/vod-fe....edback--contact-deta

Biper y Sus Amigos - La Biblia [4K]

Hola amiguitos, les compartimos esta hermosa canción que les dejara un gran mensaje a todos los pequeñitos, que la disfruten.

Escúchanos en las plataformas digitales
Spotify:
https://open.spotify.com/album..../0mB0WkkFroZzzSoevSX
TIDAL:
https://tidal.com/browse/album/86285951
iTunes:
https://itunes.apple.com/mx/al....bum/la-banda-de-bipe

Escucha nuestra playlist en Spotify creada especialmente para ti:
https://open.spotify.com/user/....0xjqbzh0admmhmcljq1f

Suscribete, comparte y comenta en nuestros vídeos:
https://www.youtube.com/user/Biperysusamigos

Síguenos en Facebook y Twitter:
https://www.fb.com/biperysusamigosoficial
https://twitter.com/biperoficial

Letra De La Canción:

//la B-I-B-L-I-A//
Es el libro de mi Dios
La B-I-B-L-I-A

En ella solo confío yo
En la B-I-B-L-I-A

//la B-I-B-L-I-A//
Es el libro de mi Dios
La B-I-B-L-I-A

En ella solo confío yo
En la B-I-B-L-I-A

Lee tu Biblia
///y ora cada día///
Lee tu Biblia
///y ora cada día///
Y crecerás

Lee tu Biblia
///y ora cada día///
Lee la Biblia
Y ora cada día
///y crecerás///

Lee la Biblia
Y ora cada día
Y crecerás

//la B-I-B-L-I-A//
Es el libro de mi Dios
La B-I-B-L-I-A

En ella solo confío yo
En la B-I-B-L-I-A

Lee tu Biblia
///y ora cada día///
Lee tu Biblia
///y ora cada día///
Y crecerás

Lee tu Biblia
///y ora cada día///
Lee tu Biblia
Y ora cada día
///y crecerás///

Lee la Biblia
Y ora cada día
Y crecerás


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