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At 2:00 in the official trailer, the narrator explains that you can "even program the game of life, if you like".
What does this mean ?
Is he referring to a game feature ?
He is referring to Conway's Game of Life.
The Game of Life is interesting because it is both simple and Turing complete, so it is a good indicator of Factorio's level of flexibility (on par with that of Minecraft's redstone circuitry, for example).
Required, but never shown