I have heard many times thats quantum mechanics doesnt apply at the macroscopic level. But Im not sure if I fully understood what was meant. Surely quantum mechanics applies even to macroscopic objects, its just that the wavefunction of such objects is so highly localized that we in effect can never see any quantum effects? On the wikipedia page about MWI it says this: "Everett's theory just considers it (quantum superposition) a real phenomenon in nature and applies it to macroscopic systems in the same way as it is conventionally applied to microscopic systems." and "Tipler reports Hawking saying that MWI is "trivially true" (scientific jargon for "obviously true") if quantum theory applies to all reality" But as I said, isnt it true that quantum mechanics applies at all scales, and thus to all reality, but we are just unlikely to see weird quantum effects on the macroscale?