Gonna be real, if your entire knowledge base is that you’ve heard that there are fees for entering cities then you really do need to do some googling. A lot of tourist destinations in europe charge tourism taxes in a variety of forms, and can because they are worth travelling to.
It also depends on what you consider to be cheap and worth travelling for. Eastern Europe is pretty cheap and great for WWII buffs or hikers, but not so good for people just looking to party. Amsterdam has plenty of food and culture and is cheaper than Stockholm, but still more expensive than somewhere like Lisbon.
Maybe sort out your own communication before making snide comments about other people’s.
Ah, I see what you mean - that the superposition is a model of our uncertainty of unobserved actions, rather than the actual state of the particle. While that was my understanding initially too (because it makes sense) our testing, things like the double slit experiment, has shown behaviours that only make sense if they do occupy both states simultaneously. Quantum computing is actually reliant on qubits being in a 0/1 superposition for it to work. It’s what makes the entire thing so maddening, because experimental evidence has disproven every attempt to make it make sense.
First thing my quantum mechanics professor told us was that if you think you understand quantum mechanics you definitely do not understand quantum mechanics. He was at the time one of the world’s leading experts on quantum applications, and had just proven the existence of an additional state of matter that quantum theory predicted, and straight up told us to our faces that he didn’t understand it, he just knew that it works.
Quantum superpositioning. Schrödinger was right, it’s absolutely ridiculous and the cat can’t be alive and dead at the same time, box or not.
The problem is it provably does work that way, or at least in a way that is indistinguishable from it, ridiculous or not, and we don’t really know why. We’ve learnt many of the rules, managed to trap particles in superimposed states, even discovered that plants take advantage of it to transport energy more efficiently, and it’s just a thing that happens, an apparently fundamental rule of existence. And it doesn’t make any fucking sense.
No, toilets have charges because shitting and pissing are necessary human bodily functions but doing it in public is illegal, so they have a monopoly on where you can piss or shit and can make you jump through basically whatever hoops they want in order to access their facilities. Nobody needs to go to Venice, Edinburgh, or Barcelona, but millions do every year because of the history and culture they can only access there.