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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.
The word "matrix" literally means "womb" in its older sense.
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.