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In The Matrix, how are babies made?
(iusearchlinux.fyi)
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.
It also refers to a 2D array of numbers in linear algebra. This data structure is used to store the synaptic weights of an artificial neural network.
It really is a deeply-thought-out movie.