Why Does Space Have Three Dimensions? // TRAIN BRAIN

Why Does Space Have Three Dimensions?

Build up your knowledge this year with Brilliant! Start learning for free at https://brilliant.org/sabine/ and get a 30-day free trial plus 20% off a premium subscription, which includes daily unlimited access!
Why does space have 3 dimensions? Why not 2? Or 4? Or 7? It’s because physics wouldn’t work properly. Let’s take a look at the major reasons for why physics needs 3 dimensions.
?T-shirts, mugs, posters and more: ➜ https://sabines-store.dashery.com/
? Support me on Donorbox ➜ https://donorbox.org/swtg
? Transcript with links to references on Patreon ➜ https://www.patreon.com/Sabine
? Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/
? Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsletter/
? Audio only podcast ➜ https://open.spotify.com/show/0MkNfXlKnMPEUMEeKQYmYC
? Join this channel to get access to perks ➜
https://www.youtube.com/channel/UC1yNl2E66ZzKApQdRuTQ4tw/join
? Buy my book ➜ https://amzn.to/3HSAWJW
#science #physics

Sabine Hossenfelder

As simple as possible, but not any simpler! Science and technology updates and summaries. No hype, no spin, no tip-toeing around inconvenient truths. Currently 5 videos a week (Tue-Wed-Thu and Sat-Sun). Early access for channel members. Sabine Hossenfeld...

The Laws of Nature Are Ugly. Do We Have to Accept This?

The Geothermal Advantage Nobody Talks About

Quantum Physics Can Change the Past, Physicists Show

Why Does Space Have Three Dimensions?

Dark Matter Might Just Be… Normal Matter.

Finally a Use for String Theory!

This is why I believe that the future already exists

The Multiverse Just Killed Our Dreams of a Final Theory

Action at a Distance Can Explain Dark Matter, Physicists Show

Surveillance Tech Is Shockingly Advanced

AI Is Coming For Scientists’ Jobs. Seriously.

We Thought This Particle Was Impossible To Measure!

It’s The End Of An Era For Physics.

Why Quantum Computers might never work

The Clean Energy Breakthrough Everyone Missed

Crazy: Scientists Compute With Human Brain Cells

Do Black Holes Exist? Some Physicists Don’t Think So

Yes, Chaos Can Create Order, New Experiment Shows

Are We Using the Wrong Kind Of Electricity?

This Is Why Wormholes Are Making Headlines Right Now

Is AGI Coming In 2026?

Nanobots: The Truth Behind the Headlines

Surprise: Free Will Needs Quantum Physics to Fail, Physicists Show

China Makes Breakthrough With Thorium Nuclear Reactor. Where is the West?

What is time, really?

Can Warp Drives Be Engineered? This Former NASA Researcher Thinks So

AI Is Breaking The Internet As We Know It

Speed-of-Light Computing Could Get Us to AGI Very Fast

Where does Everything come from?

Big Tech Wants To Build Data Centers In Space: Does This Make Sense?

100+ Years Old Debate About Quantum Reality Settled With Experiment. Really?

New Fossils Suggest That Life On Earth Started Twice

The Next Big Thing in Tech is Almost Here

Reality Doesn’t Need Complex Numbers, Physicists Prove

The Big Problem With Solar Power

15 Year-Old Just Finished his PhD in Quantum Physics. I had a look at his thesis.

Solar System Moves Way Too Fast, Cosmological Theory in Doubt

Small Nuclear Reactors are Coming --- Against All Odds

I Worry AI Might Become Conscious – And We Won’t Notice

This is a special time in human history

Scientists may have detected dark matter.

Huge Gravity Anomaly Discovered!

All of Nature Needs only One Constant, Physicists Prove

Odds Are The Universe is Full Of Intelligent Life, Mathematician Finds

It Took Physicists 50 Years To Prove Einstein Right About This

Is it pointless now to fight climate change?

AI Is Suddenly Surprisingly Good At Physics

The Slow Agony of Living in Europe

The Strange Reason Quantum Physics Looks Normal

How Close Are We to a New Mass Extinction?

Physicists Prove That Universe is not a Simulation

Nobel Prize Discovery Incompatible With New Data

This Simple Trick Solves Impossible Physics Problems

The Anti-AI Resistance Is Here

Quantum Knots Created Matter, Physicists Say

I was SO wrong about quantum computing.

Finally, Real Battery Breakthroughs!

These Mathematicians Don’t Believe Large Numbers Exist. I’m Serious.

Mysterious “Dark Star” Made of Dark Matter Spotted in Webb Telescope Data (Maybe)

Physicist Discover Hidden Rules of Life

Whatever happened to the Electric Vehicle Revolution?

Beware the New AI Pseudoscience.

Physicist Solves 100 Year Old Problem. Really?

Astrophysicists Find Evidence for Unidentified Aerial Phenomena

Positive Geometry Could Save Physics — or Destroy It

Plagiarism Charges Against Nobel Prize for Artificial Intelligence

Current AI Models have 3 Unfixable Problems

String Theory is “Fashion,” Penrose Said. We Finally Have a Response

NASA Is Considering Nuking An Asteroid To Spare the Moon

Quantum Healing Might Be Real – But Not Like We Thought

Interstellar Object 3I/ATLAS Looks Increasingly Weird

The Webb Telescope Just Observed Faster Than Light Signals

Why is Everyone Suddenly Talking about Nuclear Fusion?

How AI Is Replacing Mathematicians

Is Gravity Just an Illusion Caused by Entropy? New Theory Explains How.

The 2025 Physics Nobel Prize: Macroscopic Quantum Tunneling

The 2025 Nobel Prize in Physics: Yet another surprise

Does Acceleration Create Particles from Nothing? These Physicists Say they can test it

Don’t Die: The Philosophy That Breaks Capitalism

How long will it take to solve the 5 big physics problems?