Are there more than three dimensions in our geometry?
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I donât think anything in that video suggests that there are more than 3 spatial dimensions. However, some areas of theoretical physics suggest it might be the case. Some believe gravity might function via multiple dimensions, and I think that current theories on black holes suggest that they might have more than 3 dimensions (such as everything inside a black hole simultaneously appearing to be at the surface).
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Any credible source on any of those claims? Last Iâve read all of the higher number of spatial dimensions theories are just variants on string theory, which is untestable with our current methods as the predicted size of the strings is so small that in effect we cannot test it and if we canât even test it then it doesnât really have any impact on anything that actually matters.
how do i revert a post to a previous version of itself?
Click the pen icon in the top right (next to the posted at time), that opens a popup where old versions can be viewed and thereâs also a button to revert to the previous version. If a post is edited just a few minutes after it was created, then that doesnât create a new version so reverting to an earlier version is not possible.
where is the button for that? i canât find it.
Right there, next to the text saying when the post was made.
not that one, the button to revert the post
edit for screenshot purposes
Itâs big and red. Even if that exact button is not visible to normal users I expect a less threatening button to be available when navigating the version history with the arrows on the left side.
Well apparently it is a staff only action:
So you need to copy-paste the old content into the edit window manually to get your post back to the previous content.
that takes way too much reformatting for the post i want to revert or it takes removing half of every line that i copy from the HTML view or iâd need to copy each line individually and all of those sound like too much work so iâm just gonna leave it how it is
Click the âRawâ button, which I assume shows the bare markdown you can just copy-paste into the post edit window.
Would a homemade VPN be faster or slower than a normal VPN service?
Likely faster because youâd be able to dedicate an entire server for your connection, so you can use the entire bandwidth for example up to 1 Gb/s. Though, I think a lot of VPN providers do take care to have massive amounts of bandwidth to have enough to go around. Maybe at least for 100 Mb/s for each user, which in practice means that the shared VPN connections have enough bandwidth for most users to not really notice that they donât have an absolute ton of bandwidth. Anyway unless you have a gigabit connection at home, you wonât be able to take advantage of the larger amount of bandwidth as the amount of VPN bandwidth you can use depends on your home internet connection.
So for me I wouldnât consider setting up a VPN myself as many server hosting companies disallow setting up VPNs (or at least public ones). Instead much more useful would be to not share an IP address with other VPN users. That would make it much less likely for Google to give you CAPTCHAs so using such a VPN without a shared IP would be less annoying.
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I canât wait to be able to afford 8 GB/s fiber from Bell.
Yes, the extra dimension theories do seem to all be related to string theory. I couldnât find any references to theories for or against it from the last 10 years. The CERN website presents it as still a valid theory, but they still need to discover gravitons first: Extra dimensions, gravitons, and tiny black holes | CERN.
As for black holesâ contents being also on the event horizon, I couldnât find anything specifying extra dimensions as a cause of that. Holographic theory holds that a black holeâs contents could be reduced to 2 dimensions, spread across the event horizon. Holographic principle - Wikipedia
Other theories relate it to Hawking radiation. It seems like the maths suggest the phenomenon is possible, but thereâs no real agreement on why.
And yes, even if they find evidence for any of this, it wonât affect anything practical in the near future. Interesting to think about, though.
I recently watched a documentary about the first image of a black hole that had for some reason also parts about a group working on explaining how the surface of a black hole could in fact store all the information thatâs put in the black hole.
I find it weird that this one âtheoryâ gets a pass from the scientific community, where if any new âtheoriesâ in a similar vein are proposed those people get marked as cranks. And all of the theories are as out there. So I find it pretty hypocritical, and Iâm against accepting string theory as having any validity until there is some way to test it or something it would actually affect.
Which theory? The extra-dimensional one? I thought that the scientific community had mostly given up on string theory, but it seems that certain ideas from it are still seen as worth considering. I do think itâs a bit of an issue that theoretical physics considers mathematical equations as evidence in itself for a theory being valid, when it would be possible to link just about any set of numbers by an equation. But itâs all driven by what people are interested in researching, which is also driven by the media. Itâs like in the new video from Oliveriver, where peopleâs ideas of whatâs possible are constantly shifted by media reports, except with the media publishing outlandish new ideas all the time, and no one being able to just dig somewhere to find evidence.
Anyway, back in the realm of Hard Science, it seems that fire-breathing creatures could really evolve (/jk) :
String theory.
Still, it seems to me that the only reason string theory has any merit is that it got the first mover advantage. If anyone proposed such a crazy theory now, theyâd be laughed out of the room. But string theory still enjoys some credibility as a real research topic thanks to its history. Thatâs the part I find objectionable.