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The number of days per week is a prime number...
(reddthat.com)
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.
Building also ends up weird because the size was based on what ancient Romans did which obviously wasn't based on any modern system.