These are the asteroids to worry about

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Stephen Hawking thought an asteroid impact posed the greatest threat to life on Earth. Thanks to Kiwico for sponsoring this video. For 50% off your first month of any crate, go to kiwico.com/veritasium50
For other potential world ending catastrophes, check out Domain of Science: ve42.co/DoS

Special thanks to:
Prof. Dave Jewitt from UCLA Earth, Planetary, and Space Sciences
Prof. Mark Boslough from Sandia National Labs
Scott Manley: www.youtube.com/user/szyzyg
Ryan Wyatt at Morrison Planetarium
Prof. Amy Mainzer
Alexandr Ivanov for the opening shot of Chelyabinsk Meteor

Maps of Asteroid Impacts —https://ve42.co/Map

Time passing animation from Universe Sandbox — universesandbox.com/

Opposition Effect — ve42.co/Belskaya2000
Belskaya, I. N.,

A 3D atlas of the universe - Carter Emmart

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View full lesson: ed.ted.com/lessons/a-3d-atlas-of-the-universe-carter-emmart

For the last 12 years, Carter Emmart has been coordinating the efforts of scientists, artists and programmers to build a complete 3D visualization of our known universe. He demos this stunning tour and explains how its being shared with facilities around the world.

Talk by Carter Emmart.

Bells Theorem: The Quantum Venn Diagram Paradox

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

Support MinutePhysics on Patreon! www.patreon.com/minutephysics
Link to Patreon Supporters: www.minutephysics.com/supporters/

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

MinutePhysics is on twitter — @minutephysics
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And Google (does anyone use this any more?) — bit.ly/qzEwc6

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

Created by Henry Reich

Why Do Mirrors Flip Left

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Перейдите на curiositystream.com/minutephysics, чтобы получить бесплатный месяц CuriosityStream вместе с Nebula!

Поддержите MinutePhysics на Patreon! www.patreon.com/minutephysics
Ссылка со спонсорами на Patreon: www.minutephysics.com/supporters/

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

MinutePhysics в твиттере — @minutephysics
И Facebook — facebook.com/minutephysics
И Google (кто-то им еще пользуется?) — bit.ly/qzEwc6

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

Создано Генри Райхом.

Paraboloids and The Building which Set Things on Fire

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The building in London at 20 Fenchurch Street started to set things on fire! But it could have been worse. I use a paraboloid to set other things on fire.

Oh, and theres a maths proof.

News stories about the concave building:
www.dailymail.co.uk/news/article-2786723/London-skyscraper-Walkie-Talkie-melted-cars-reflecting-sunlight-fitted-shading.html
www.bbc.co.uk/news/uk-england-london-23930675
www.independent.co.uk/news/uk/home-news/walkie-talkie-skyscraper-to-be-fitted-with-permanent-sunshade-after-it-melted-cars-9379037.html

Festival of the Spoken Nerd:
festivalofthespokennerd.com/

Play with the Geogebra parabola demonstration:
www.geogebra.org/material/show/id/189498

Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com/
Book: makeanddo4D.com/
Nerdy maths toys: mathsgear.co.uk/

How many different Youtube videos are possible?

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Download the podcast of my BBC Radio4 show, Domestic Science (Ep1) www.bbc.co.uk/programmes/p02pc9x6/episodes/downloads

In this video I start with how many 256×256 greyscale images are possible and work my way up to the maximum number of possible YouTube videos.

Original question on twitter:
twitter.com/dedwarmo/status/755799688759037953

Here is our radio show on the BBC radio player. Let me know if it does not work for you.
www.bbc.co.uk/programmes/b07lxqq8/episodes/player

Our Festival of the Spoken Nerd DVD and download:
shop.festivalofthespokennerd.com/

Galaxy M81 image credit: NASA/JPL-Caltech/ESA/Harvard-Smithsonian CfA

Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com/
Maths book: makeanddo4D.com/
Nerdy maths toys: mathsgear.co.uk/