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There should be a semicolon punctuation for exclamation and question marks.
(self.showerthoughts)
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.
So, for the record, these things come into existence in the first place simply because someone, somewhere, starts using them. Language is something that drifts over time, and punctuation is no exception.
It’s a bit harder to do this digitally though since the glyphs aren’t just marks on paper.