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Why isnt the sky violet?

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Music by Nathaniel Schroeder www.soundcloud.com/drschroeder Created by Henry Reich

Featuring 3Blue1Brown
Watch the 2nd video on 3Blue1Brown here: www.youtube.com/watch?v=MzRCDLre1b4

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This video is about Bells Theorem, one of the most fascinating results in 20th century physics. Even though Albert Einstein (together with collaborators in the EPR Paradox paper) wanted to show that quantum mechanics must be incomplete because it was nonlocal (he didnt like «spooky action at a distance»), John Bell managed to prove that any local real hidden variable theory would have to satisfy certain simple statistical properties that quantum mechanical experiments (and the theory that describes them) violate. Since then, GHZ and others have managed to extend the theoretical work, and Alain Aspect performed the first Bell test experiment in the late 1980s.

Thanks to Vince Rubinetti for the music: soundcloud.com/vincerubinetti/one-two-zeta

And thanks to Evan Miyazono, Aatish Bhatia, and Jasper Palfree for discussions and camaraderie during some of the inception of this video.

REFERENCES:

John Bells Original Paper: inspirehep.net/record/31657/files/vol1p195-200_001.pdf

Quantum Theory and Reality: www.scientificamerican.com/media/pdf/197911_0158.pdf

«What Bell Did» By Tim Maudlin: arxiv.org/pdf/1408.1826

Bells Theorem on Wikipedia: en.wikipedia.org/wiki/Bell's_theorem

2015 experimental confirmation that QM violates Bells theorem: arxiv.org/pdf/1508.05949.pdf
journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.250402

Bells Theorem without Inequalities (GHZ): dx.doi.org/10.1119/1.16243

Kochen-Specker Theorem: en.wikipedia.org/wiki/Kochen–Specker_theorem

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Created by Henry Reich

One Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in one minute!

In this episode, we discuss the basic nature of gravity, one of the four fundamental forces in our universe.

Come back for a new video every week! Created by Henry Reich

Thanks to Skillshare for supporting this video: skl.sh/MinutePhysics for 2 free months!

This video is about a multistable perceptual illusion, similar to the hollow face illusion, whereby maps or aerial or satellite photos look upside down/inside out, ie, concave (valley) parts look convex and convex (mountainous) parts look concave. Just flip the images around and things will make a lot more sense! Its just because our eyes gauge depth based on the location of shadows, and the sun always casts shadows on the bottoms of things.

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REFERENCES
Twitter posts:
twitter.com/Astro2fish/status/859799730565414912
twitter.com/BadAstronomer/status/859800278358528001

Bad Astronomy Blog post: blogs.discovermagazine.com/badastronomy/2010/05/19/a-lunar-illusion-youll-flip-over/

Multistable perception en.m.wikipedia.org/wiki/Multistable_perception

Top-left Lighting en.m.wikipedia.org/wiki/Top-left_lighting

Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Created by Henry Reich

Link to keep watching over on Vsauces channel RIGHT HERE: www.youtube.com/watch?v=hYf6av21x5c

What if there were a tunnel through the middle of the earth and you jumped in?

Also, explore a map of the big bang! www.bigbangregistry.com

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Music by Nathaniel Schroeder

Thanks to Nima Doroud for contributions and to Perimeter Institute for support.
www.perimeterinstitute.ca

Created by Henry Reich Created by Henry Reich

Check out the «What is a Day?» interactive video at labs.minutelabs.io/what-is-a-day/
Its super cool!!! (and made by Jasper Palfree

ytimg.preload(https://r2---sn-axq7sn7e.googlevideo.com/generate_204);ytimg.preload(https://r2---sn-axq7sn7e.googlevideo.com/generate_204?conn2);What Causes Day Length to Change from Summer to Winter? — YouTube<link rel=«alternate» type=«application/json oembed» href=«www.youtube.com/oembed?format=json

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Это видео о том, почему слова переворачиваются в зеркале влево и вправо (горизонтально), но не вверх и вниз (вертикально). Ответ связан с зеркальным отражением, как будто зеркала это окна в другой мир (как альтернативные вселенные, вывернутые наизнанку!), и непрозрачностью того, на чем мы пишем.

ССЫЛКИ
Зеркальное отражение
ru.wikipedia.org/wiki/Отражение_(геометрия)

Видео PhysicsGirl про зеркала
www.youtube.com/watch?v=vBpxhfBlVLU

Принцип Ферма
electron6.phys.utk.edu/optics421/modules/m1/Fermats principle.htm

Объяснение Томаса–Ферми
en.wikipedia.org/wiki/Thomas–Fermi_screening

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Minute Physics рассказывает в игровой форме о старых и новых проблемах в физике – и всё это всего за одну минуту!

Создано Генри Райхом.

How is the chemical energy of gasoline transformed into kinetic energy of a moving car? And where does that kinetic energy go when the car crashes into something and stops moving?

Thanks to Ford (http://www.takeagoodlook.com) for sponsoring this video.

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Music by Nathaniel Schroeder, www.soundcloud.com/drschroeder

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute! Created by Henry Reich

FREE FACT: An oblate spheroid is a special case of an ellipsoid where two of the semi-principal axes are the same size.

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Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!

Music by Nathaniel Schroeder www.soundcloud.com/drschroeder

Thanks to Nima Doroud for contributions. Created by Henry Reich