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This open problem taught me what topology is 28 min 
What is a "Body Farm"? | Fascinating Horror Shorts 1 min 
WWDC 2026 - Siri AI Impressions! 15 min 
UNDEAD DOGS 1 min 
LORN - THERE IS STILL TIME 2 min 
LORN - ALT.VEL.PTCH 3 min 
Why Have Orcas Turned Violent? | Fascinating Horror Shorts 1 min 
Wii U: Downfall of a Downfall (Part II) - Scott The Woz 145 min 
How can you overcome writer’s block? 1 min 
Can Frogs Power a Lightbulb? | Fascinating Horror Shorts 1 min 
REPLIKA 4 min 
3 ways to choose a sunscreen #shorts 1 min 
I read every major CS paper of the last 100 years... 11 min 
I cannot believe Jodrell Bank let me do this 24 min 
Introduction to OpAmps #electronics #science #technology #funny 1 min 
Who’s afraid of an open-weight model? GLM, context bombing and post-Black Hat attacks 27 min 
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Mark Rober's $60 Million Dollar Experiment 77 min 
RANKING POPULAR DISHES: EUROPE EDITION 17 min ![A stroll around my hometown, Aldridge (and the stories that shaped my youth) [PART 1]](https://adm.6-9.space/storage/films/posters/yt_a-stroll-around-my-hometown-aldridge-and-the-stories-that-shaped-my-youth-part-1_1789704139.jpg)
A stroll around my hometown, Aldridge (and the stories that shaped my youth) [PART 1] 40 min 
How to SHOOT & EDIT B-Roll For Beginners! 11 min 
IBM’s cloud collab, Meta’s Muse Glimmer & OpenAI’s upcoming Astra model 37 min 
The Most Expensive Ad of All Time 2 min 
The Problem with Ronaldo's YouTube Channel 1 min 
I Tested 47 Sony Cameras – These Are My Favorite! 18 min 
Best 4K Multicam Setup for Live Events! (Full Gear Breakdown) 12 min 
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This Poodle Killed Three People | Fascinating Horror Shorts 1 min 
Cybersecurity's Telephone Game Problem📞 1 min 
⏰ You have more time than you think 1 min 
Crypto Beyond Dark Web Myths 1 min 
The Polar Cruisers: Winter Climb to the Hanging Cities | AI 4K — Retrofutura 8 min 
Furnace 4 min 
Нестрашный Хоррор 😅 (Hellmart) 26 min 
Can Tech Transform my Body in 3 Months? 13 min 
We Built the BEST PC 14 min 
Her Eyes Were Green 7 min 
I compared every smartwatch 1 min 
When did we start using passports? - Kristin Surak 7 min 
Mac vs Windows - It's not close in 2026! 22 min 
Bretagne 3 min 
Grandfather 2 min 
Тут Громко Пугают 😅 (Don't Play This) 26 min 
Is Yvonne Happy with Her New Laptop? 12 min 
Samsung S26 Ultra Hands on - What's ACTUALLY New? 15 min 
Get 4 Tech Acronyms Win! 1 min 
I Tested YouTubers' Favourite Products 30 min 
This Mars rover's cool. But have you seen its wheels? 23 min 
iPhone 18 Pro - Does variable aperture matter? 1 min 
Apple just Copied Microsoft’s Worst Idea - iPhone Duo, Airpods 5, iPhone 18 Pro & More 19 min 
BYE 3 min The inscribed square/rectangle problem, solved using Möbius strips and Klein bottles. Playlist with more neat proofs: https://www.youtube.com/playlist?list=PLZHQObOWTQDPSKntUcMArGheySM4gL7wS Instead of sponsored ad reads, these lessons are funded directly by viewers: https://3b1b.co/support An equally valuable form of support is to simply share the videos. This argument was originally by Herbert Vaughan, appearing for examples in this issue of the Topology Proceedings. https://topology.nipissingu.ca/tp/reprints/v06/tp06107.pdf The on-screen argument for why all closed non-orientable surfaces must intersect themselves in 3d is a slight variation on one I heard from Dan Asimov. 2020 Paper by Greene and Lobb: https://arxiv.org/pdf/2005.09193 Nice Quanta article about this result: https://www.quantamagazine.org/new-geometric-perspective-cracks-old-problem-about-rectangles-20200625/ Timestamps: 0:00 - Inscribed squares 1:00 - Preface to the second edition 3:04 - The main surface 10:47 - The secret surface 16:45 - Klein bottles 22:38 - Why are squares harder? 25:10 - What is topology? ------------------ These animations are largely made using a custom Python library, manim. See the FAQ comments here: https://3b1b.co/faq#manim https://github.com/3b1b/manim https://github.com/ManimCommunity/manim/ All code for specific videos is visible here: https://github.com/3b1b/videos/ The music is by Vincent Rubinetti. https://www.vincentrubinetti.com https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown https://open.spotify.com/album/1dVyjwS8FBqXhRunaG5W5u ------------------ 3blue1brown is a channel about animating math, in all senses of the word animate. If you're reading the bottom of a video description, I'm guessing you're more interested than the average viewer in lessons here. It would mean a lot to me if you chose to stay up to date on new ones, either by subscribing here on YouTube or otherwise following on whichever platform below you check most regularly. Mailing list: https://3blue1brown.substack.com Twitter: https://twitter.com/3blue1brown Instagram: https://www.instagram.com/3blue1brown Reddit: https://www.reddit.com/r/3blue1brown Facebook: https://www.facebook.com/3blue1brown Patreon: https://patreon.com/3blue1brown Website: https://www.3blue1brown.com
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