I've been reading up on some QM lately and one of the things that gets my mind tied in knots is the how the measurement of an electron affects it's path in the double-slit experiment.
Isn't our own observation with our own eyes, which uses light in the environment, a form of measurement? If some detector placed within the experiment affects the path of the electron, then how does our own measurements with our own senses, which can be thought of being detectors, affect the path of the electron? We use reflected light as a source of information about the world. Does this light in the environment interact with the electrons in any way? If our own observation with our eyes, that uses light, collapses the wave function, then how does the light in the environment without any observer affect the path of the electron? I hope my question makes sense.
Also, when it comes to "spooky action at a distance", physicists tell us that two particles can relay information instantaneously. How do we know that they are actually separate particles, and not one large particle if the measurement of one affects the other? I think that our minds tend to spread out space-time in such a way, and also creates arbitrary boundaries creating separate particles, or objects, that they seem like different things themselves. Does physics, and quantum mechanics specifically, take into account our own brains and sensory systems and how they may interfere, or skew, the results of any observation we make?