Higher: http://bit.ly/blockhigher
Same height: http://bit.ly/SameHeight
Lower: http://bit.ly/BlockLower

Special Thanks to:
Henry (MinutePhysics): http://www.youtube.com/minutephysics
Destin (Smarter Every Day): http://www.youtube.com/smartereveryday
Greg and Mitch (ASAP Science): http://youtube.com/asapscience
Elise Andrew (I F***ing Love Science): http://youtube.com/iflscience

Thanks to everyone at RIT and Dickinson College who helped with the making of this video:
Rochester Institute of Technology
Robert Teese, Katelyn Wilkerson, Andrew Gillie, Andrew Stidwill

Dickinson College
This experiment was the brainchild of David Jackson based on a demo at Princeton.
Priscilla Laws, Catrina Hamilton-Drager, Maxine Willis

High-speed camera support:
Charles Zwemer and Bria Antoine

When a tube spins with an X and an O labelled at either end, why do we see only one letter during the rotation?

How the brain works, how we learn, and why we sometimes make stupid mistakes.
Submit ideas: http://ve42.co/GotIdeas
Apply to work with me: http://ve42.co/JoinUs

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

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

This video was inspired by the book Thinking Fast and Slow by Daniel Kahneman

Harpist: Lara Somogyi http://ve42.co/Lara
Animator: Jesse Agar http://ve42.co/ThisPlace
Filmed by Raquel Nuno

Music by Kevin MacLeod, http://incompetech.com "Sneaky Adventure" "Harlequin"

Why does shaken soda explode? Does ice melt first in fresh or salt water?
Thank you Squarespace for sponsoring this video. Go to https://squarespace.com to save 10% off your first purchase of a website or domain using code: VERITASIUM

This video features experiments that have been shown to me by science teachers over the years. Does ice melt fast in salt water or fresh water was an experiment introduced to me at the Utah Science Teachers' conference. The ring of metal over a chain demo came from a teachers event in Florida. The idea shaking a carbonated drink increases pressure came from an email.

Special thanks to Petr Lebedev for building the pressure gauge.

Links to literature are below:
Victims of the pop bottle, by Ted Willhoft. New Scientist, 21 August 1986 p.28

Carbonation speculation
The Physics Teacher 30, 173 (1992); https://doi.org/10.1119/1.2343501

Agitation solution
The Physics Teacher 30, 325 (1992); https://doi.org/10.1119/1.2343556

Filmed by Cristian Carretero, Jordan Schnabel, Jonny Hyman, and Raquel Nuno

Music from https://epidemicsound.com "Seaweed" "Quietly Tense" "Mind Shift" "Observations"

Why do droplets of food coloring attract, repel, and chase each other?
Snatoms molecular models: http://igg.me/at/snatoms
More about this topic: http://wke.lt/w/s/VRjRQ

Original paper on droplets: http://stanford.edu/~manup/doc....s/Cira_DancingDrople
Marangoni Flow: http://web.mit.edu/2.21/www/Le....c-notes/Surfacetensi
Surface Energy: https://itf.fys.kuleuven.be/~j....oi/papers/Wetting%20

Filming and master pipetting by Raquel Nuno
Research and writing by Aaron White

The birth of a baby Panda is captured on camera at a sanctuary in China.

Taken From Panda Babies

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Elena interpreta "Memory" de Barbra Streisand en las segundas audiciones a ciegas de la tercera edición de La Voz Kids.

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Javier interpreta "Same Mistake" de James Blunt en las terceras audiciones a ciegas de la tercera edición de La Voz Kids.

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Physics of contraptions meant to go faster than light.
Audible: http://bit.ly/AudibleVe
My video about the problem with Facebook: http://bit.ly/PwFB

Special thanks to MinutePhysics for visual effects and Prof. Geraint Lewis for revisions to earlier drafts of this video.

Gabriela interpreta "La Vie En Rose" de Edith Piaf en las segundas audiciones a ciegas de la cuarta edición de La Voz Kids.

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Original japanese edition, released in 1980.


Track Listing:

1. Silk Road - 0:02
2. Bell Tower - 4:10
3. Heavenly Father - 6:28
4. The Great River (Yellow River) - 10:38
5. The Great Wall of China - 13:22
6. Flying Celestial Nimphs - 15:29
7. Silk Road Fantasy - 20:22
8. Shimmering Light - 24:50
9. Westbound - 28:14
10. Time - 31:17
11. Bodhisattva - 34:50
12. Everlasting Road - 36:51
13. Theme From Silk Road - 42:44


All rights belong to their respective owners.

A huddle of penguins is formed to protect each other from the cold - but young chicks can end up crushed or frozen.
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Planet Earth http://bit.ly/PlanetEarthPlaylist
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Penguins: Spy In The Huddle
Discover what it really means to be a penguin as the latest spy cameras give us a whole new perspective on the behaviour and extreme survival tactics of these incredible and hugely charismatic birds. Following the success of Polar Bear - Spy on the Ice, the spy cams move to the next level with Penguincam, a range of super-realistic animatronic cameras disguised as penguins, chicks and eggs. Travelling to the freezing Antarctic to focus on the emperor penguins, and interspersing their stories with the very different experiences of the desert-based Humbolt in South America and the Falklands Islands-based rock-hopper, Penguin - Spy in the Huddle gives the inside track on all the drama and challenges they face throughout the year, as well as capturing plenty of comedy moments! The amazing technical wizardry of the penguincams allows them to blend into the penguin colonies, allowing a closer view of the creatures than ever before as they immerse themselves in the penguin world, both on land and at sea, where the camera's disguise leads to some surprising encounters - one penguin even falls in love with rockhoppercam!

About BBC Earth:
The world is an amazing place full of stories, beauty and natural wonder. Explore the official BBC Earth YouTube channel and meet the animals and wildlife of your planet. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history documentaries. Dramatic, rare and wild nature doesn't get more exciting than this. Subscribe to be the first to view new animal documentary videos. You can also become part of the BBC Earth community on Facebook, Twitter and Instagram. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community.

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This is a channel from BBC Studios who help fund new BBC programmes.

Alicia interpreta "Blanco y negro" de Malú en las sextas audiciones a ciegas de la cuarta edición de La Voz Kids.

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The sun has been producing light for about five billion years but where does all its energy come from? The most common idea is that the sun is burning gas - like a giant fireball in the sky. If this were true, the sun would have gone out long ago. So how is the sun actually fuelling itself? It is converting its own mass into energy. By combining protons (the nucleus of hydrogen) into helium, it squeezes some mass into energy - 4.3 billion kg per second. It is Einstein's famous E=mc^2 which gives us the quantitative relationship between mass and energy, where c is the speed of light.

I've created an educational product to help people learn chemistry!
You can buy it here: http://www.snatoms.com

Unai interpreta "El Arte De Vivir" de Antonio José en las cuartas audiciones a ciegas de la cuarta edición de La Voz Kids.

Si estás en España:
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This is what the world would look like if you could see invisible air currents, temperature gradients, and differences in pressure or composition of the air.
Support Veritasium on Patreon: http://ve42.co/patreon

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

I first saw a Schlieren imaging setup around ten years ago in Melbourne. I was immediately fascinated by the way I could see the warm air coming off my hand. I hadn't expected the currents to be moving that fast or to be so visible. This was a tricky setup to get right because alignment is very important and here I'm just working with what I had lying around the house mostly (plus the mirror). For the best Schlieren photography, making sure the mirror is stable is essential. I want to improve my setup so the mirror doesn't wobble back and forth too much creating the pulsing light and dark sections of this video.

The relationship between index of refraction of air and temperature, pressure, humidity and wavelength is complicated. This website will calculate it for you: http://emtoolbox.nist.gov/Wavelength/Ciddor.asp

Slow motion by Hollywood Special Ops: http://www.hollywoodspecialops.com

Sound Effects by A Shell in the Pit: http://www.ashellinthepit.com

Filmed by Raquel Nuno
Special thanks to Blake Nichols for assistance

In 2018 the kg will be defined by Planck's constant, not a hunk of metal.
Try a free book from Audible for 30 days http://ve42.co/audible
Special thanks to the staff at NIST who made this possible: Darine Haddad, Jon Pratt, Stephan Schlamminger, and Ben Stein.

Additional footage and animations by Sean Kelley, Jennifer Lauren Lee, and Frank Seifert.

I have been obsessed with measurement for a long time and I'm not sure quite how it happened. The world's roundest object played a role in this. I guess I'm just fascinated by how difficult it is to pin down a quantity like a kilogram. A physical object seemed like a good idea until the mass of the international prototype kilogram wasn't as constant as expected. These methods of the Kibble balance and silicon sphere have shown better precision than 20 parts per billion, making them superior to the old method. The agreement between Avogadro approaches

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

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

Interferometer video by TSG Physics: https://www.youtube.com/watch?v=j-u3IEgcTiQ

Music from http://epidemicsound.com "ExperiMental1" by Gunnar Johnsén

Studio filming by Raquel Nuno