While these are harmless questions, the founders of quantum mechanics fought hard over what the answers were. There were 2 camps fundamentally. The "realists"..
1.That you can only disturb a system if it is nearby, by interacting directly with it (Locality)
2. They assumed that physical Reality exists even when it isn't being measured. That as long as one can know the outcome of a value of a measurement with certainty and *not disturb the system*, that systems properties were considered an element of physical reality.According
Decades later a physicist🧑🔬
1.Subjective experience does matter and that data is relevant
2.If we believe in subjective experience,our dream characters and characters in all realities do as well
3. All Realities are real.
1. Describe, do not explain
2. Categorize the data
3. Explain the data
We repeat these steps until we have a better understanding of the underlying phenomena we are dealing with. Since we aren't discriminating people's experiences a priori..