Eh, even the 5th dimension is a total stretch. There is no way of knowing any of this really

this isn't really accurate IMO, from the start when he says 2d flatlanders can only see 2 dimensions.
In fact if you were 2 dimensional you would only be able to see one dimension, so with the example of the balloon the 2d flatlander would just see a line getting longer then shorter.
Similarly, we can only really see in 2 dimensions, we just see in 2 dimensions twice (once with each eye), and extrapolate from that. We can move in three dimensions, but if we could see in 3 dimensions we would be able to see things behind other things

edit: i havent finished the video yet but yeah once the guy gets to the fifth dimension it's basically just meaningless word gymnastics

the only thing u were interested in a while ago was 2d

Trump will bring us into the 4th dimension and end the liberal conspiracy that it doesn't exist

uh sorry i went to legoland and watched a 4D movie and i can guarantee to you stupid fucks that the fourth dimension is certainly real

Isn't a 4D movie where you can smell it too?

https://youtu.be/2s4TqVAbfz4

the universe is flat and infinite and probably only 3d this is a waste of time fuck learning

First, not quite sure why you are linking the crappy version of the video. This is the original video.

Second, the person who created the video is not a physicist or in anyway related to one.

Third, http://physics.stackexchange.com/a/55848. The guy is a crackpot and the theory has no physical significance whatsoever.

if the universe is flat how can people claim the earth is a globe

The universe is flat in it's three spacial + one temporal dimensions. Meaning if you draw a triangle in our universe, the inner angles will always add up to 180degrees. If the universe was curved then it would be greater or less than 180degrees for a triangle. See this nice layman's article for a more in-depth explanation.

The universe being flat is actually a really nice mathematical simplifier when it comes to dealing with the metric of our spacetime, so it is pretty interesting that our physical world makes equations neater rather than messier.

https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g/videos

If you want actual physicists discussing spacetime and shit that there is the channel for you. The only problem is, they don't dumb it down too much and most of their videos are interconnected so if you're a layman you really have to watch almost all of them to somewhat have an idea of what they're actually saying

the earth can only be a globe if the universe is flat. in any other universe it'd be not truly round (tho only imperceptibly so)

to clarify about the universe being flat: iirc its only flat w/in the observable portion to a rather high certainty but it is possible for it to be round/hyperbolic to such a slight degree that it would be imperceptible given the current amount of universe we can see. That said, even if it was round to the maximum degree it could be and still be in a margin of error it would take longer for a photon to circle all the way around the universe than its likely that photon will even exist since the entire universe would need to be ~150x the current size so its effectively flat for any practical purposes within the next ~10 trillion years or so

Rad thanks