I took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they're there. The first time I heard about shade balls the claim was they reduce evaporation. But it turns out this isn't the reason they were introduced.

Huge thanks to LADWP for arranging this special tour for me. Next time let's put the GoPro on the submersible!

The balls are made of high density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. They are 10cm (4 inches) in diameter and contain about 210ml of water. So the main reason they are on the reservoir is to block sunlight from entering the water and triggering a chemical reaction that turns harmless bromide into carcinogenic bromate. This effect occurs with prolonged exposure to bromate so regulators insist that levels be kept below 10 microgram per liter on average over a 12 month period.

Special thanks to Patreon supporters:
Donal Botkin, Michael Krugman, Ron Neal, Stan Presolski, Terrance Shepherd, Penward Rhyme and everyone who provided feedback on an early draft of this video.

Thanks to:
Las Virgenes Reservoir for footage of initial shade ball dump
Euro-Matic for bird into jet-engine footage

Researched and Produced by Casey Rentz

Animations by Maria Raykova

Music from http://epidemicsound.com "Colorful Animation 4" "Seaweed"

And from Kevin MacLeod "Marty Gots a Plan"

This is an educational video about the science of water quality.

I got to drive the world's first car (replica), patented by Benz in 1886
Check out the series on new safety features: http://ve42.co/MB
This video is sponsored by Mercedes-Benz, who invited me to come to Stuttgart to see their latest cars, crash test facilities and experience the innovations they are working on.

Physics is something that is directly applicable to car safety. Cars go fast, but they also sometimes collide with obstacles, which brings them to a sudden stop, subjecting the car and occupants to very high accelerations, which can cause injury or death. So the major idea to improve car safety is to reduce these accelerations and there are a number of ways to do this:

Passive safety:

Seat belts: keep passengers in the vehicle, preventing them from continuing with constant velocity, flying through the windshield and suffering a worse deceleration when they make contact with the road.

Crumple zones: increase the distance over which deceleration occurs, thereby reducing peak magnitude of deceleration.

Air bags: increase the distance over which the head decelerates, again reducing peak magnitude of deceleration of the head.

Active Safety:
Anti-lock braking system: rather than 'locking' the wheels as can happen if you slam on the brakes with a traditional braking system leading to the tires skidding across the road, ABS attempts to control the amount of braking so that the tires always roll with static friction in contact with the road. This increases the backward frictional force that can be applied to the tires, again increasing the distance over which deceleration occurs, and it gives the driver an opportunity to steer to avoid the collision (hence why it's referred to as an active safety system).

Special thanks to Mercedes for having me visit facilities in Stuttgart. I had a lot of fun making these videos so please do check out the series on Mercedes Benz's channel: http://ve42.co/MB

Filmed by Simon Schneider
Edited by Hoplite Creative and Trevor Carlee

My hypothesis is that the algorithm, rather than viewer preference, drives views on the site. As the algorithm shifts, various YouTubers experience burnout (as what used to work no longer works) and right now click-through rate is the key metric. So clickable titles and thumbnails are the only way to get a lot of impressions and hence views - they are the only way to go viral. This leads me to wonder which audiences will become most prevalent on the site and if there will even be a place for educational content. In the long-term, hopefully YouTube is able to measure satisfaction through surveys and other metrics to ensure an optimal experience for everyone on the site.

Flipchart artwork by Maria Raykova
Filmed by Raquel Nuno
Thumbnail by Ignat Berbeci

Scientists have combined ultrasound, viruses and synthetic drugs to control regions of the brain.
Check out Skillshare: https://skl.sh/veritasium (first 500 get 2 months free)

Special thanks to Prof. Mikhail Shapiro and Dr. Jerzy Szablowski:
http://shapirolab.caltech.edu

Human brains are complicated - the most complicated thing in the known universe, many people say. So far we understand little - just that certain regions of the brain appear to be involved in certain activities and certain disorders. In extreme cases this has led to the practice of removing sections of the brain, or using electrodes or optical fibers to control activation rates. What is unique about this approach is it offers a way to turn on and off specific brain regions without invasive surgery. It has promise because it combines existing technologies: micro-bubbles, ultrasound, synthetic viruses, and synthetic drugs to achieve this goal.

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

Animations and editing by Alan Chamberlain

Music from http://epidemicsound.com "Experimental1"

Negative Pressure Exists! http://bit.ly/TFilQ8
Vsauce's Space Straw: http://bit.ly/XubIm3
Smarter Every Day's Prince Rupert's Drop: http://bit.ly/10VQBGW
ViHart's Optimal Potatoes: http://bit.ly/14egJoe

Thanks to Questacon for filming! Check out their slow-mo playlist: http://bit.ly/ZoWFGR
Science Alert brings science to your news feed: http://on.fb.me/14ehuxA

Music by Kevin Mcleod (http://incompetech.com): Pale Rider & The Cannery

Mosquitoes are attracted to me and it's likely due to my genes.
This video is sponsored by 23andMe https://23andme.com/veritasium
Huge thanks to Prof. Immo Hansen and team: http://ve42.co/hansen

References:
Genome Wide Association Study for self-reported mosquito attractiveness:
http://ve42.co/MossieGWAS

The twin study showing correlated attractiveness is stronger for identical twins:
http://ve42.co/MossieTwins

Some things we know make mosquitoes more attracted to you:
Exercising, higher metabolism, higher body temperature, more body odor, being pregnant, type O blood, infrequent bathing, lactic acid, ammonia, acetone.

There are a number of folk remedies people believe protect them from mosquito bites like drinking alcohol, eating garlic, or taking vitamin B. These do not appear to provide any benefit in lab studies and in fact drinking alcohol is associated with increased mosquito activity because it causes blood vessels near the surface of the skin to dilate.

And apparently some of your attractiveness to mosquitos is simply genetic. This may be mediated through your immune system, which is what a lot of the genes identified were associated with.

Molecular models are microSnatoms: http://snatoms.com

Filming in New Mexico by Raquel Nuno
Animations by Jacqui Robertson

The opinions and conclusions drawn in this video are those of Veritasium and not 23andMe.

It takes the moon about 27 days to orbit the Earth. What makes it go round? It is the gravitational attraction of the Earth on the moon. Due to the moon's velocity, the Earth keeps pulling the moon towards it without the moon actually getting closer to the Earth. This is similar to how satellites orbit the Earth.

In Queenstown, New Zealand, I jumped off the Kawarau Bridge - the site of the first bungy jump. It was a thrilling experience, preceded by a terrifying, gut-wrenching half hour wait. All in all an awesome adventure, even if the woman fitting my harness didn't know the first thing about the acceleration of free-falling bodies.

Subscribe to Veritasium - it's free! http://bit.ly/YSWpWm
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Happy Geek Week! http://bit.ly/16wdDuk

Everyone has played with a mixture of corn starch and water (or at least I hope they have). This was one of my favorite experiments as a kid. Your hand slides into the slime easily when moving slowly but the mixture behaves as a solid if you hit it quickly. That is what is meant by 'non-Newtonian' - the fluid's properties change depending on its relative motion. These properties can be exploited to dramatic effect as has been shown on speaker cones before. Here I wanted to understand what is going on, what frequencies and amplitudes work best so I used a slow-mo camera.

Thanks to everyone at the YouTube Space LA for helping me film this. I couldn't have done it without you.

Music licensed from http://www.cuesongs.com
Love Lost (Instrumental) by Temper Trap
A Life in the Day by Ghost of Otis
Fortune's Fool Instrumental by Hiatus & Shura
The Man by Audio Android

Innovative research conducted in Lausanne, Switzerland has shown that a combination of neurotransmitters and electrical stimulation can restore movement to the lower limbs of previously paralysed rats. But in order for this motion to be made voluntarily the rats must be motivated to walk. This motivation comes in the form of cheering, visual cues, and of course, chocolate.

Why Trees Are Amazing: http://bit.ly/TFilQ8
Space Junk: http://bit.ly/XlLdjG
Why Astronauts Are Weightless: http://bit.ly/SuF2p1
Higgs Boson Update: http://bit.ly/Vw1Sgu

If the sun were entirely made of protons, how many would there be in the sun? How can this be worked out using the Google search field?

At the jumper's fastest point, the acceleration is by definition zero. That is because the jumper is going from speeding up to slowing down. At this instant then there is no change in the jumper's velocity. This is counter-intuitive for a lot of people because it's easy to confuse velocity with acceleration. Velocity is how fast something goes while acceleration is the rate at which velocity changes.

Pioneering NASA mathematician Katherine Johnson has died at the age of 101. Johnson was part of a group of African-American women who worked on critical mathematical calculations in the early days of human spaceflight, as chronicled in the best-selling book and hit movie “Hidden Figures.”

"She was an American hero and her pioneering legacy will never be forgotten,” said NASA Administrator Jim Bridenstine.

Expedition 61 Crew, Record-Setting Astronaut Christina Koch Return to Earth

Expedition 61 Commander Luca Parmitano of ESA (European Space Agency), Soyuz commander Alexander Skvortsov of Roscosmos and NASA Flight Engineer Christina Koch landed safely on Earth near the town of Dzhezkazgan, Kazakhstan, Feb. 6 after bidding farewell to their colleagues on the complex and undocking their Soyuz MS-13 spacecraft from the Poisk Module on the International Space Station. Koch completed a 328-day, 139-million mile mission on the orbital outpost --- the longest spaceflight ever conducted by a woman in history and the second longest single spaceflight by a U.S. astronaut. Parmitano and Skvortsov wrapped up a 201-day mission in space spanning 85.2 million miles.

Lanzar en órbita a astronautas estadounidenses desde EE.UU, enviar un nuevo rover a Marte y continuar preparándose para misiones humanas a la Luna son solo algunos de los planes de la NASA para el año 2020.

Este video se puede descargar libremente desde: https://go.nasa.gov/2TyyAoh
________________________________________
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While Apollo placed the first steps on the Moon, Artemis opens the door for humanity to sustainably work and live on another world for the first time. Using the lunar surface as a proving ground for living on Mars, this next chapter in exploration will forever establish our presence in the stars. ✨

We are returning to the Moon – to stay – and this is how we are going!

Actress Kelly Marie Tran of “Star Wars: The Rise of Skywalker” lent her voice to this project.

NASA's Parker Solar Probe mission has returned unprecedented data from near the Sun, culminating in new discoveries published on Dec. 4, 2019, in the journal Nature. Among the findings are new understandings of how the Sun's constant outflow of material, the solar wind, behaves. Seen near Earth -- where it can interact with our planet's natural magnetic field and cause space weather effects that interfere with technology -- the solar wind appears to be a relatively uniform flow of plasma. But Parker Solar Probe's observations reveal a complicated, active system not seen from Earth.

Music Credit: Smooth as Glass by The Freeharmonic Orchestra

Read more: https://www.nasa.gov/feature/g....oddard/2019/nasas-pa

Video Credit: NASA's Goddard Space Flight Center
Karen Fox (ADNET): Writer
Sarah Frazier (ADNET): Writer
Genna Duberstein (USRA): Producer
Genna Duberstein (USRA): Editor
Chris Smith (USRA): Narrator
Adriana Manrique Gutierrez (USRA): Animator
Jonathan North (USRA): Animator
Scott Wiessinger (USRA): Animator
Adam Szabo (NASA/GSFC): Scientist
Russ Howard (NRL): Scientist
Dave McComas (SwRI): Scientist
Stuart Bale (University of California, Berkeley): Scientist
Justin Kasper (University of Michigan): Scientist
Nour Raouafi (Johns Hopkins University/APL): Scientist
Eric Christian Ph.D. (NASA/HQ): Scientist
Adam Szabo (NASA/GSFC): Project Support
Please give credit for this item to:
NASA's Goddard Space Flight Center

This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at: http://svs.gsfc.nasa.gov/13282

If you liked this video, subscribe to the NASA Goddard YouTube channel: http://www.youtube.com/NASAExplorer

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What's different about food in space? Former NASA astronaut Mike Massimino breaks down all the differences between eating on Earth and eating in space. Is astronaut ice cream REALLY a thing? Who decides what food is brought to space? Can you eat burgers in space? Why do astronauts use tortillas instead of bread?

Mike Massimino is a former NASA astronaut, senior advisor for space programs at the Intrepid Museum, and professor at Columbia University.

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Former NASA Astronaut Explains How Food Is Different in Space | WIRED

De tu boca sale aliento
Que mi alma necesita
En tu palabra hay poder
Que trae vida a mis huesos

Jesús tu nombre es el verbo de aliento
Jesús tu nombre es el agua de vida
De tu boca sale aliento
Que mi alma necesita

Jesús tu nombre es el verbo de aliento
Jesús tu nombre es el agua de vida
Oh Jesús tu nombre es mi pan.

Tú hablas y el sordo oye
El ciego ve al oír tu voz
Grande es tu poder
Grande es tu poder, Jesús

Tú hablas y el cojo anda
Con tu poder el mudo habla
Habla sobre mi
Habla sobre mí, Jesús

Era ciego y ahora puedo ver
Sordo fui y hoy te escucho
Habla sobre mí, Jesús

Preso fui y hoy libre soy
Perdido estaba, mas hoy tu hijo soy
Habla sobre mí, Jesús
Habla sobre mi
Habla sobre mí, Jesús

Habla sobre mi
Habla sobre mi
Habla sobre mi

Habla sobre mi
Habla sobre mi
Habla sobre mí, Jesús

Era ciego y ahora puedo ver
Sordo fui y hoy te escucho
Habla sobre mí, Jesús

Preso fui y hoy libre soy
Perdido estaba, mas hoy tu hijo soy
Habla sobre mí, Jesús
Habla sobre mi
Habla sobre mí, Jesús

Daniel Calveti presenta Enamora'o una canción romántica dedicada a su esposa Shari que también puedes dedicar al amor de tu vida.

Compra la canción en itunes: https://geo.itunes.apple.com/us/album/enamorao/1327534311?i=1327534439&mt=1&app=music&itscg=30200&itsct=afftoolset_1&at=10lt8i
Spotify: https://open.spotify.com/album..../3aN0jjS4VRJq9zl2T3B
Deezer: http://www.deezer.com/es/album/53840812

LETRA:

ENAMORA'O
Daniel Calveti

De todas las boricuas, tú eres la más bella
el coquí lo canta al son de las maracas
el viento y las palmeras bailan mientras miran como tú y yo caminamos por la playa.

Mujer hermosa, mujer tan linda mis ojos son de ti solita. De Ponce a Caguas lo saben
todos que este negrito a ti te ama.

Ay, ay que lindo, que lindo estar enamorado

Ay, ay que lindo, que lindo estar enamorado

De todas las boricuas, tú eres la más bella
el coquí lo canta al son de las maracas
el viento y las palmeras bailan mientras miran como tú y yo caminamos por la playa.

Mujer hermosa, mujer tan linda mis ojos son de ti solita.
El flamboyant se ha convertido en nuestra sombra de amor eterno.
Y los tambores suenan bonito al ritmo bello de tus ojitos.

Ay, ay que lindo, que lindo estar enamorado
Ay, ay que lindo, que lindo estar enamorado


El que halla esposa, halla el bien;

y yo te hallé a Ti mujer
El que hay esposa, halla el bien;
y yo te hallé a Ti mujer

Pero que... Ay, ay que lindo, que lindo estar enamorado
Ay, ay que lindo, que lindo estar enamorado
Ay, ay que lindo, que lindo estar enamorado
Ay, ay que lindo, que lindo estar enamorado


Puedes encontrar esta canción así:

Enamorado
Enamorao
Enamorados
musica romántica
música cristiana para dedicar
canción cristiana para dedicar
canción cristiana romaántica

Fecha de lanzamiento: 12 enero 2018