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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
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.