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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. A showerthought should offer a unique perspective on an ordinary part of life.
It's cloning. That how Neo has been born over and over again.
The machines stores the generic code of all the first humans they put in pods and then they just crank out copies.