If X never happened would Y exist today?

We aren't talking human actions. I'm talking about past. Note, I think everything is in flux.

A electron is in a wave particle duality, however if observed it becomes a particle. However, not observed it acts like a wave.

Not only that, but measuring an electron this side of the universe, will effect an electron on the other side of the universe i.e. EPR.

Measurements probably effect the universe in other ways.

Like for example, if someone decided that 2+2=5

the work of Heisenberg on electrons and all of that

Pretty sure Heisenberg worked on methamphetamine and not electrons

Edit: Is this a reference to a TV show?

I know of Young's double slit, Schrodinger's Cat, the work of Heisenberg on electrons and all of that, but I still feel it differs. The assumption is made that the past is still happening and can be manipulated, but the past to me seem untouchable and locked. The idea of the past still being in flux comes dangerously close to suggesting that time travel into the past is possible, which I don't think I will ever support. Yes, I believe that speeding up into the future is possible because of special relativity, but for me it's a one way journey.

Yeah, I actually go on evidence and not intuition. There is nothing in principle to stop time travel and several plausible mathematical ways to travel back in past. You misunderstand relativity, you don't speed up the future.

QM doesn't assume that. It's just that stuff is entangled before you observe it. The point is you are seeing it through classical eyes, which is wrong.

With goats milk?