hyperloop was very low air pressure subway tubes for high speed trains. Works for research tesring tracks impractical to infeasible for real world applications. But it apparently what killed high speed rail in california (because wait this will be better)

The cars in tubes thing was a seperate stupid idea.

its not as bad as it sounds. But it is the other side of the coin of academic freedom. You can do what you want, but that just means i end up wanting to do everything and then of course failing to finish evreything. But i have learned the solution is to find collaborators, and to accept that some things will simply not get done. The only problem is that the things that do not get done are sometimes important, even if they are not the most interesting (such as filing travel reimbursement forms). TL:DR no worries but do think carefully before going for a phd, there is very little external structure

or end up stressed post docs with a lot of discarded hobbies and scientific projects

is there a historical ncd?

also when they see this post