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quantum mechanics
(sh.itjust.works)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Except that Schrödinger was trying to exemplify how impractical the Copenhagen interpretation was; that trying to apply quantum properties to systems larger than atoms would be extremely difficult, if not impossible.