This reminded me of The Queen of Trees[1] by Deeble & Stone, a mind blowing documentary about this wonderful tree. Indeed one of the most fascinating documentaries I ever watched.
[1](https://youtu.be/xy86ak2fQJM)
C'mon... as if banning cryptographic messagery services would end criminals from encrypting their messages and sending the payload in plain text like they were doing since internet's inception
> "Moreover, such a wormhole would be unstable. If for example a spaceship were to fly into one, it would instantly collapse into a black hole—an object in which matter disappears, never to be seen again. The connection it provided to other places in the universe would be cut off."
I think it's a somewhat garbled description of the Einstein-Rosen bridge, which is a feature of the maximally extended Schwarzschild spacetime--you can see a diagram of this spacetime in [1]. Roughly speaking, this spacetime has two "exterior" regions that look like an ordinary universe with a spherically symmetric gravitating object at its center (these are regions I and III in the diagram). The gravitating object that you can actually see (as in, receive light signals from) in the exterior region is a white hole (region IV in the diagram); but if you try to fly into the white hole, you can't get inside--you end up inside the black hole instead (region II in the diagram).
The "Einstein-Rosen bridge" interpretation comes from viewing this spacetime in the coordinates used in the diagram, which are not the same as the natural coordinates of an observer in either exterior region. In the coordinates used in the diagram, it looks like you have two disconnected universes (regions I and III are disconnected at the bottom) that get connected by a spherical "wormhole" or "bridge" which starts at zero size, expands to a surface area of 4 pi M^2, where M is the "mass" of the hole, and then shrinks back down to zero size and vanishes, leaving two disconnected exterior regions again (regions I and III are disconnected again at the top). The bridge shrinks too fast for anyone in one exterior region to fly through it and reach the other exterior region; any attempt to do that ends up with you trapped inside the black hole (region II) and destroyed in the future singularity.
I think (just a guess) that a wormhole is essentially a place where gravity is basically infinite (or at least at black hole levels), and that's what's connecting the parts of spacetime.
i.e. in order to warp spacetime enough, you need massive gravity. Or negative mass.
So any object passing through would be squashed to nothing.
> In a nutshell, you can't catch it again right away after having recovered.
If that's the case, out of curiousity why there has been numerous reported cases of people that catched covid again after already recovering from it?
Edit:
So... after reading the article I'm not sure this is the case for all people as this research has been done only on a group of asymptomatic & low/mild response people. IMHO for a sentence like that to be valid, it should be demonstrated on the other part of the population, those that have a high immune response against the virus and end up in a critical state from it.
"If that's the case, out of curiousity why there has been numerous reported cases of people that catched covid again after already recovering from it?"
There have been many, many news articles that speculate about this, but to date, I'm aware of two papers that document re-infections. Both papers isolated and sequenced the viruses involved, and both papers documented re-infection with significantly mutated variants of the same virus.
