I don’t like statements like “we can never know” this or that. For example, you can convince everyone that quantum immortality works by killing them along with yourself. (This shouldn’t pose any risk if you’ve already convinced yourself :-) Paul Almond has proposed that this can solve the Fermi paradox: we don’t see alien civilizations because they have learned to solve complex computational problems by civilization-level quantum suicide, and thus disappeared from our view.
It seems probable to me that if we think a little harder, we can figure out a way to investigate observer-dependent statements scientifically.
I don’t like statements like “we can never know” this or that. For example, you can convince everyone that quantum immortality works by killing them along with yourself. (This shouldn’t pose any risk if you’ve already convinced yourself :-) Paul Almond has proposed that this can solve the Fermi paradox: we don’t see alien civilizations because they have learned to solve complex computational problems by civilization-level quantum suicide, and thus disappeared from our view.
It seems probable to me that if we think a little harder, we can figure out a way to investigate observer-dependent statements scientifically.