Does the behavior of things-that-behave-quantumly typically affect macro-level events, or is this restricted to when you look at them and record experimental data as a direct causal result of the behavior?
Yes; since many important macroscopic events (e.g. weather, we’re quite sure) are extremely sensitive to initial conditions, two Everett branches that differ only by a single small quantum event can quickly diverge in macroscopic behavior.
Yes; since many important macroscopic events (e.g. weather, we’re quite sure) are extremely sensitive to initial conditions, two Everett branches that differ only by a single small quantum event can quickly diverge in macroscopic behavior.