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

Everyone is familiar with liquid water, ice and water vapour, but what are the differences between these three states of matter? Solids, liquids and vapours of the same substance differ in the motion of the molecules and the distance between them.

Animations courtesy of VisChem (Trade Mark), Copyright 1995, Roy Tasker. Thanks for all your help!

Padre nuestro,
que estás en el cielo,
santificado sea tu Nombre;
venga a nosotros tu reino;
hágase tu voluntad
en la tierra como en el cielo.

Danos hoy nuestro pan de cada día;
perdona nuestras ofensas,
como también nosotros perdonamos
a los que nos ofenden;
no nos dejes caer en la tentación,
y líbranos del mal.

Amén

MinutePhysics on permanent magnets: http://www.youtube.com/watch?v=hFAOXdXZ5TM
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Subscribe to MinutePhysics: http://bit.ly/1eVPynh

Magnetism seems like a pretty magical phenomenon. Rocks that attract or repel each other at a distance - that's really cool - and electric current in a wire interacts in the same way. What's even more amazing is how it works. We normally think of special relativity as having little bearing on our lives because everything happens at such low speeds that relativistic effects are negligible. But when you consider the large number of charges in a wire and the strength of the electric interaction, you can see that electromagnets function thanks to the special relativistic effect of length contraction. In a frame of reference moving with the charges, there is an electric field that creates a force on the charges. But in the lab frame, there is no electric field so it must be a magnetic field creating the force. Hence we see that a magnetic field is what an electric field becomes when an electrically charged object starts moving.

I was inspired to make this video by Prof. Eric Mazur http://mazur.harvard.edu/emdetails.php

Huge thank you to Ralph at the School of Physics, University of Sydney for helping us out with all this magnetic gear. Thanks also to geology for loaning the rocks.

This video was filmed in the studio at the University of New South Wales - thanks to all the staff there for their time and support.

Music: Firefly in a Fairytale, Nathaniel Schroeder, and Love Lost (Instrumental) by Temper Trap licensed from CueSongs.com

Einstein's classic thought experiment involves sitting on a train travelling at the speed of light. If you hold a mirror in front of your face, will you see your reflection in a mirror? How could light from your face reach the mirror if the mirror is travelling away from you? But it would be a pretty spooky train if you couldn't see your reflection so Einstein felt this solution wasn't realistic. On the other hand if you could see your reflection, it would mean light was travelling at the speed of light inside the train. But that meant the same light observed from outside the train would be going twice the speed of light. This again seems inconsistent. So Einstein resolved that you must see your reflection but that light must travel at the same speed inside and outside the train. The only way this is possible is if space and time are perceived differently by observers inside and outside the train.

Does quantum entanglement make faster-than-light communication possible?
What is NOT random? http://bit.ly/NOTrandoVe
First, I know this video is not easy to understand. Thank you for taking the time to attempt to understand it. I've been working on this for over six months over which time my understanding has improved. Quantum entanglement and spooky action at a distance are still debated by professors of quantum physics (I know because I discussed this topic with two of them).

Does hidden information (called hidden variables by physicists) exist? If it does, the experiment violating Bell inequalities indicates that hidden variables must update faster than light - they would be considered 'non-local'. On the other hand if you don't consider the spins before you make the measurement then you could simply say hidden variables don't exist and whenever you measure spins in the same direction you always get opposite results, which makes sense since angular momentum must be conserved in the universe.

Everyone agrees that quantum entanglement does not allow information to be transmitted faster that light. There is no action either detector operator could take to signal the other one - regardless of the choice of measurement direction, the measured spins are random with 50/50 probability of up/down.

Special thanks to:
Prof. Stephen Bartlett, University of Sydney: http://bit.ly/1xSosoJ
Prof. John Preskill, Caltech: http://bit.ly/1y8mJut

Looking Glass Universe: http://bit.ly/17zZH7l
Physics Girl: http://bit.ly/PhysGirl
MinutePhysics: http://bit.ly/MinPhys
Community Channel: http://bit.ly/CommChannel
Nigel, Helen, Luke, and Simon for comments on earlier drafts of this video.

Filmed in part by Scott Lewis: http://google.com/+scottlewis

Music by Amarante "One Last Time": http://bit.ly/VeAmarante

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

We have just seen the first image of a black hole, the supermassive black hole in the galaxy M87 with a mass 6.5 billion times that of our sun. But what is that image really showing us?

This is an awesome paper on the topic by J.P. Luminet:
Image of a spherical black hole with thin accretion disk
Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 228-235
https://ve42.co/luminet

Using my every day intuition I wondered: will we see the "shadow" of the black hole even if we're looking edge on at the accretion disk? The answer is yes because the black hole warps space-time, so even if we wouldn't normally be able to see the back of the accretion disk, we can in this case because its light is bent up and over the black hole. Similarly we can see light from the bottom of the back of the accretion disk because it's bent under the bottom of the black hole. Plus there are additional images from light that does a half turn around the black hole leading to the inner rings.

What about the black hole "shadow" itself? Well initially I thought it can't be an image of the event horizon because it's so much bigger (2.6 times bigger). But if you trace back the rays, you find that for every point in the shadow, there is a corresponding ray that traces back to the event horizon. So in fact from our one observing location, we see all sides of the event horizon simultaneously! In fact infinitely many of these images, accounting for the virtually infinite number of times a photon can orbit the black hole before falling in. The edge of the shadow is due to the photon sphere - the radius at which light goes around in closed orbits. If a light ray coming in at an oblique angle just skims the photon sphere and then travels on to our telescopes, that is the closest 'impact parameter' possible, and it occurs at sqrt(27)/2*r_s

Huge thanks to:
Prof. Geraint Lewis
University of Sydney https://ve42.co/gfl
Like him, I'm hoping (predicting?) we'll see some moving images of black holes tomorrow

Prof. Rana Adhikari
Caltech https://ve42.co/Rana

Riccardo Antonelli - for excellent images of black holes, simulations and ray-tracing code, check out:
https://ve42.co/rantonels

The Event Horizon Telescope Collaboration
Check out their resources and get your local link for the livestream here: https://ve42.co/EHT

Special thanks to Patreon supporters:
Donal Botkin, Michael Krugman, Ron Neal, Stan Presolski, Terrance Shepherd, Penward Rhyme

Filming by Raquel Nuno
Animation by Maria Raykova

Descubre la historia de La Sirenita Ariel, una alegre, curiosa y aventurera princesa que vive bajo el mar y quiere ser parte del mundo de los humanos. Con gran valentía y determinación y junto a sus amigos Flounder y Sebastián, Ariel se embarca en la aventura de su vida para cumplir su sueño.
#SoyPrincesaSiendoYo
#DescubriendoLaSirenita

Sitio Oficial: http://www.disneylatino.com/disneyjunior/

Síguenos en Facebook: http://www.facebook.com/DisneyJuniorLatinoamerica

¡Haz click en el botón SUSCRIBIR y entérate de los nuevos videos de Disney Junior en Youtube!

Stained glass is thicker at the bottom - so is it a liquid? Earth's mantle enables plate tectonics, so is it a liquid?
Check out Audible: http://bit.ly/AudibleVe
Sign up for the mailing list: http://www.veritasium.com
Pitch drop experiment: http://www.thetenthwatch.com

Thanks to Meg Rosenburg for scripting and animation, Raquel Nuno for filming and Aaron White for script consultation.

ES UNA AVENTURA - PISTA - MARCELA GANDARA

Complete unedited interviews: http://www.youtube.com/watch?v=8dcw98B2Nzg
Trees can weigh hundreds or even thousands of tons, but where do they get this mass from? A few common answers are: the soil, water, and sunlight. But the truth is the vast majority of a dry tree's mass comes from the air - it originated as carbon dioxide

Epigenetics means women have different active x-chromosomes in different cells. Animation courtesy of http://wehi.tv
Music by Amarante: http://bit.ly/VeAmarante
Animation: Etsuko Uno
Art and Technical Direction: Drew Berry
Sound Design: Francois Tetaz & Emma Bortignon
Scientific Consultation: Marnie Blewitt
Courtesy of Walter and Eliza Hall Institute of Medical Research: http://wehi.tv

When a female embryo is four days old it consists of just 100 cells. At this point the x-chromosome from Mom and the one from Dad are both active. But in order for proper development to occur, one of the x chromosomes must be switched off.

Through a tiny molecular battle within each cell, one of the x-chromosomes wins and remains active while the loser is deactivated.

This is done by wrapping the DNA tighter around proteins, modifying histone tails, and DNA methylation - molecular markers to indicate this DNA should not be read.

What's surprising is that it's pretty random which x chromosome wins - sometimes it's Mom's and sometimes it's Dad's. So when a female is just 100 cells big, her cells have a mix of active x-chromosomes, some from Mom and some from Dad.

A pulsing black hole in the centre of a distant galaxy sheds light on black hole and galaxy formation. How fast are black holes rotating and how does that rotation change over its life-span?

Huge thanks to Prof. Geraint Lewis and study author Dr. Dheeraj Pasham.

A loud quasi-periodic oscillation after a star is disrupted
by a massive black hole
https://ve42.co/pasham

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

Music from http://epidemicsound.com "Colorful animation 4" "serene story 2" "To the stars 01" "Black Vortex

Animations by Alan Chamberlain and courtesy of NASA

1 Hora de música con Marcela Gandara ( Audio Oficial )
https://youtu.be/sawJvxsNVow

I am working on some big new projects I'm excited to share with you!

So this video is a little different from most of the others. The channel is an element of truth, after all, not an element of science. This is my truth. It may not be everyone's but that's ok too.

Clips included were from:
Chernobyl and Pripyat - drone shots from shooting Uranium
Obsidian dome, California
Panum Crater
El Capitan
The Pyramids of Giza
Toronto buildings
The Holocaust Memorial in Berlin
Abu Simbel temple at Aswan, Egypt
Sydney Harbour
Milky way time-lapse from the badlands of South Australia
Sunset over Warrnambool, Victoria
Big Bang animation courtesy of NASA
Sunrise over Bondi
Water off New Caledonia
Great white sharks in the Neptune Islands, South Australia
Crosswalk at Town Hall Sydney
EDUtubers at the YouTube EDU summit in San Francisco
Concert in Sydney
Jetpacking in Western Sydney
Vi's triangles at Perimeter Institute, Waterloo Canada
Aurora Borealis north of Fairbanks Alaska
Sagrada Familia, Barcelona, Spain
Hiking with MinutePhysics in Washington State

Music Licensed from cuesongs.com "The Secret Tower" by Nicholas O

Website: https://rewindlatino.com/
Facebook: https://www.facebook.com/RewindLatino/
Instagram: https://www.instagram.com/rewindlatino/
POPURRI MARCELA GANDARA Dame Tus Ojos, Supe Que Me Amabas, Un Viaje Largo, Antes De Ti, En Tu Hogar

Lista de canciones:

01. Marcela Gandara - Supe Que Me Amabas
https://www.youtube.com/watch?v=AB2x_DII3W0

02. Marcela Gandara - Antes De Ti
https://www.youtube.com/watch?v=4hnMuR7AuoY

03. Marcela Gandara - Un Viaje Largo
https://www.youtube.com/watch?v=KGUnH3WPgJg

04. Marcela Gandara - En Tu Hogar
https://www.youtube.com/watch?v=U5LztnAVjYM

05. Marcela Gandara - Es Una Aventura
https://www.youtube.com/watch?v=m7VXVSjzDpo

06. Marcela Gandara - Girando Hacia Ti
https://www.youtube.com/watch?v=C9Gvzc8iGnQ

07. Marcela Gandara - El mismo
https://www.youtube.com/watch?v=hXSBMyQ5ppk

08. Marcela Gandara - Mas Que Un Anhelo
https://www.youtube.com/watch?v=nlDjul0kMvE

09. Marcela Gandara - Me Haces Crecer
https://www.youtube.com/watch?v=0oJ9yPk9rYI

10. Marcela Gandara - Quiero Ver
https://www.youtube.com/watch?v=Fy1sIfEcfXo

11. Marcela Gandara - Tu Palabra
https://www.youtube.com/watch?v=koKEc9HEOLQ

Follow Marcela Gandara:
https://www.facebook.com/marcelagandaraoficial/
https://twitter.com/Marcela_Gandara

Vastago:
http://www.vastago.com/
https://www.facebook.com/vastagomusic
https://twitter.com/vastagomusic

SYNCHRONIZE WITH DESTIN’S VIDEO: http://bit.ly/NorthernSwirl
Both videos on one page (for desktop): http://bit.ly/ToiletSwirl
Subscribe to Smarter Every Day: http://bit.ly/SubscribeSED
Click to tweet: http://bit.ly/ToiletSwirlTWT

Some notes:
We each repeated the experiment 3 times, and got the same results every time. For those of you who might be skeptical, great! A right circular prismatic kiddie pool is only $10 and you can do the experiment for yourself at your latitude. There's really no reason you shouldn't do it for yourself.

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Gordon McGladdery did all of the sound design for the video. We used two songs from other artists (licensed of course). Derek split the first one up so it fades from video to video, and Gordon split the instruments up on the second one. There are violins on one video and percussion on the other for example. It's really neat.

The neat earth animation at the beginning and the synchronizing timer was made by http://eisenfeuer.com/. He also made still images of the earth from the top and the bottom.

Thanks to Vanessa for filming in Sydney: http://youtube.com/braincraftvideo

MORE INFO:

There was a study performed at MIT years ago (http://web.mit.edu/hml/ncfmf/09VOR.pdf) that explained the physics involved. We repeated some of these demonstrations, but on opposite sides of the globe…and in a way that can be easily understood.
This site is a great resource on the Coriolis effect and ways people have gotten it wrong:
http://www.ems.psu.edu/~fraser/Bad/Ba...

All the large-scale structure in the universe may owe its existence to nothing.
Sponsored by the Dyson 360 Eye Robot #ad: http://bit.ly/2cGqBRV
Support Veritasium on Patreon: http://bit.ly/VePatreon

Thanks to Patreon supporters:
Bryan Baker, Donal Botkin, Tony Fadell, Saeed Alghamdi

Let's see how clearly I can explain this. We think of empty space as, well... empty, the epitome of nothingness. But as our understanding of physics has evolved we have realized that it's not truly empty. Space is filled with fields. There is a field for every subatomic particle. One for electrons, up quarks, down quarks, neutrinos and so on. In empty space these fields are basically zero, flat, nil. But it's impossible to make them perfectly zero so there are always some quantum fluctuations in the fields, even in a perfect vacuum. These are sometimes called virtual particles but they should really just be thought of as little disturbances in the field. Vacuum fluctuation play a role mediating the interactions of subatomic particles but they don't really have an impact on the large-scale structure of the universe, EXCEPT during inflation, right after the big bang when the universe increased in size 10^26 times. Due to this rapid expansion, those tiny fluctuations were blown up to the scale of the observable universe. And we know this by looking at the cosmic microwave background radiation where we can see slightly hotter and cooler parts of the early universe that correspond to density fluctuations. And it is these density fluctuations that allowed matter to clump together into large structures like the gigantic gas clouds that would go on to contain stars and planets. In case the video isn't clear, this is what I've been trying to say.

Animations by Gustavo Rosa

This video was sponsored in part by Dyson #ad

Are all people on Earth really connected through just six steps?
There's much more science in this than I initially expected. It turns out ordered networks with a small degree of randomness become small-work networks. This is why your acquaintances turn out to be more important in job searches and finding new opportunities than close friends.

DON'T SEND ME AN EMAIL anymore...
1. Do not send it directly to me unless you know me.
2. Send the email to someone you have met IN PERSON and know on a first name basis AND THEY KNOW YOU.
3. Make the subject line 'Six Degrees of Veritasium'
4. Explain that you're trying to get this email to me and ask them to forward it on to me (only if they know me IRL) or someone they know who might know me.
5. If your email reaches me by Sept. 1, 2015 I will email you back and ask for your address so I can send you a postcard.

Animations in this video by The Lyosacks: https://www.youtube.com/user/TheLyosacks

There are some great books on this topic:
Duncan Watts, Six Degrees: The Science of a Connected Age
Albert-Laszlo Barabasi, Linkds: How Everything is Connected to Everything Else

And here are articles I referred to:
Milgram's small world experiment: http://www.uvm.edu/~pdodds/fil....es/papers/others/196
http://snap.stanford.edu/class..../cs224w-readings/mil

Granovetter, Strength of Weak Ties:
https://sociology.stanford.edu..../sites/default/files