The Universe As You Know It Does Not Exist. Let me explain with a graph...

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[Henry-jpmc]

A 4D object drawn in 3D on a 2D screen projected into my 1D brain 😂

[deveyous]

Something tells me that if we ever actually work out the true nature of reality, it would terrify us.

[MobMentality]

I love how you admit that a 3D version of a 4D hyper cube does not improve your understanding of another dimension. Thank you for being human!

[bradleywalker]

This is the best physics video that I've EVER seen. It explains complex ideas in simple geometry illustrations. Well done!

[trapperjohn]

How would you feel if all the characters in your dream, used science to figure out that they were your dream?

[calebsmith]

I don’t mean to be “hyperbolic, ” but this just might be the most fascinating YouTube video I’ve ever seen. I don’t think I’ve ever seen a random YouTuber share an original scientific theory that is both plausible and potentially revolutionary. I’m not smart enough to know if your theory is true, but I’m blown away at your courage to present something like this so honestly

[robbierobinson]

Your graphical models and animations are hugely helpful for me to try and hold visualizations of these phenomena and relationships. A great video. The hyperbolic model seems to have a great deal going for it - at least at my level of understanding.

[MichaelWilson-pfxs]

I recommend a book called " A GUIDE FOR THE PERPLEXED" it talks about the different levels of life and being and dimensions, each higher level can understand the lower levels, but the lower levels cannot fully understand the higher levels. for example, try explaining to a dog why you're sitting in front of your pc and pushing buttons. God claims he had no beginning and has no end. In the dimension we live in, TIME and SPACE is a thing. I personally don't believe we can ever fully understand. whether or not you believe in God is a totally different matter.

[ballclawguy]

This whole video is simply incredible. Never has a video taken so many concepts that were so abstract and difficult to grasp and visualize make so much sense. I was fascinated and engrossed in this video for ever second it was playing.

[Michigander]

You did a great job explaining these concepts through both simple language and visuals! Thanks for you work

[mikestanmore]

Alex, once again, you've given me the tools to grasp what I had previously only glimpsed, and in doing so given me both a greater understanding of the universe, and a greater perspective into the mind of someone more intelligent than myself. Thankyou.

[MatteoBiagiotti]

Sometimes I have weird experiences because of epilepsy, there are moments where I start to feel kinda scared, I loose control of my thoughts but I totally feel and think "I understand everything now", it feels like nothing has importance anymore, it happened many times but I always forget what I was understanding, it is driving me crazy but maybe is just a brain disfunction.

[JeremyD]

I think this is one of your best episodes to date! You did a great job visualizing some very abstract concepts.

[gene]

"But the professor has no time
He’s got a paper to write
And the next thing on his list
Is to prove that the universe does not exist"

"Ivory Tower" by Sabine Hossenfelder.

[corbechupacabra]

What a beautiful theory. As always, incredible work.

[mullergyula]

28:26 With respect: When you derive that light travels at infinite speed from its perspective, you say time becomes zero but forget to change the distance. Length contraction should also be considered. Since you take the photon as the reference, everything else moves with the speed of light and shortens to zero. So we get a 0/0, which is undefined not infinity. You could do limes calculation, and I guess you would still get C.

[oldschoolman]

I always find this fascinating, like looking at distant galaxies, we don't see them where or how they are but where and how they were. Probably the closest we'll get to time travel.

[evilpandakillabzonattkoccu]

....could this (as well as gravity) be why the Jmes Webb Telescope is finding galaxies that seem to be 'older than they should be'?

[stephanieparker]

You and your brother do amazing work! Great topics, scripts, fantastic narration! I especially love your different perspectives on these topics. You introduce interesting topics in ways that are easier to digest compared to other science channels, yet provide a great deal of fascinating info! ❤❤🎉🎉

[karenremus]

The universe must be infinite, because if it weren’t, it would have to be “contained” inside of something — and what would that “container” be floating in? It makes no sense that the universe would have “boundaries, ” because that implies something else existing outside of them.