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The Shape Fact That Breaks Every Mathematician's Brain

2026-06-19 Science & Technology
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Dr Brian Keating
Dr Brian Keating
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Description

Moving from 2 to 3 to 1,000 dimensions in 3 steps, a ball inscribed inside a cube fills almost 0% of the space. Everything you learned about shapes stops working. Terence Tao is a Fields Medal winner and professor at UCLA, widely considered the greatest living mathematician. We cover: why geometry in high dimensions defies every low-dimensional instinct, why mathematicians deliberately go to higher dimensions to solve problems in lower ones, what Jim Simons' cone discovery revealed about singularities in 8+ dimensions, and why this isn't abstract — it's exactly where AI and LLMs operate. High-dimensional space doesn't behave. And that's now everyone's problem. Watch the full conversation here: https://www.youtube.com/watch?v=ukpCHo5v-Gc ——— 📬 Get the transcript, fascinating bonus content, and my Monday M.A.G.I.C. Message: https://briankeating.com/yt 🌠 Have a .edu email and live in the USA 🇺🇸? You automatically win a meteorite: https://BrianKeating.com/edu 🔔 Subscribe: https://www.youtube.com/DrBrianKeating?sub_confirmation=1 🎯 Support Into the Impossible on Patreon — get my weekly M.A.G.I.C. Message, unfiltered bonus content, and live monthly Office Hours with me: https://www.patreon.com/drbriankeating ⭐ Join this channel for perks, monthly Office Hours, and your name in the Member Roster at the end of every episode: https://www.youtube.com/channel/UCmXH_moPhfkqCk6S3b9RWuw/join 📚 My books: Losing the Nobel Prize (memoir): http://amzn.to/2sa5UpA Think Like a Nobel Prize Winner: https://a.co/d/03ezQFu Focus Like a Nobel Prize Winner: https://a.co/d/hi50U9U Galileo's Dialogue (first-ever audiobook): https://a.co/d/iZPi9Un Also, if you're open to it, I'd greatly appreciate a small credit in the video description, such as: Video editing by the creative team at North Cat Studio. 🌐 More: 🏄‍♂️ Twitter: https://twitter.com/BrianKeating 📚 Substack https://briankeating.substack.com/ss ✍️ Blog: https://briankeating.com/blog 🎙️ Audio-only: https://briankeating.com/podcast #intotheimpossible #briankeating #science #physics #astronomy #cosmology #podcast #universe

Top Comments (10)

@jeff-jo6fs 2026-06-19

im not even a mathmetician, but my brain is also broken

13 3 replies
@MarkThomas-hm3ju 2026-06-19

This is reminiscent of the 24D packing of spheres in the Leech lattice. Where each sphere touches the other 196560 spheres. Related to the numbers 196883 + 1 = 196884 of Monstrous Moonshine. Fascinating stuff!

8
@patrickthepure 2026-06-20

In a line segment mesh, covering a 2D region, every vertex of each line segment is shared with another segment. In fact, every vertex in the entire mesh is shared by exactly two line segments. In a triangle mesh, covering a 3D region, every edge of each triangle is shared with another triangle. Every edge in the mesh is shared by exactly two triangles. In a tetrahedral mesh, covering a 4D region, every triangular face of each tetrahedron is shared with another tetrahedron. Every face in the mesh is shared by exactly two tetrahedra. Now here’s the mind-blowing part: Imagine placing you, a 3D creature, inside one of those tetrahedra in that tetrahedral mesh covering a 4D region. To leave that tetrahedron, which is a closed region, you’d have to pass through one of its four faces. But since every face leads into another tetrahedron, and since every face you could ever pass through does the same, no matter which way you go, you’re always moving into yet another tetrahedron. You can never escape the mesh!

3 1 replies
@piotra.4140 2026-06-21

imagine a space that has N dimensions, then reduce N to 1000000 :)

3
@quantumkath 2026-06-19

Could there be a Terence Tao length in mathematics that is the largest measurement where infinities no longer make sense?

1
@ristopaasivirta9770 2026-06-23

Joke is on you, my brain was already broken.

1
@joshuazelinsky5213 2026-06-23

My favorite related examples of how high dimensional things look differently is how high dimensional oranges behave. Suppose you have an orange in d dimensions, and out 10th of orange (in terms of the radius) is rind. Then in high dimensions, almost all your orange is rind.

1
@quantumzoflyne 2026-06-23

FINALLY TERRY TAO!

0
@johnobrien8773 2026-06-23

I feel like this exposes why my econ professors' assistants at UCSD had degrees in physics.

0
@yelllwow 2026-06-22

still trying to comprehend either a 4d sphere or a 4d cube

0

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