When that thought first occurred to me, I actually found it quite uplifting. Once I realized that someone, somewhere in the expanses of space and time, already knows the answer to any answerable question—even biology questions and history questions; there are other decoherent Earths—then I realized how silly it was to think as if the joy of discovery ought to be limited to one person. It becomes a fully inescapable source of unresolvable existential angst, and I regard that as a reductio.
