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"Mortal Engines" begins... (One of my favorite Sci-Fi Young Adult series I read growing up) https://en.m.wikipedia.org/wiki/Mortal_Engines https://en.m.wikipe

"Mortal Engines" begins... (One of my favorite Sci-Fi Young Adult series I read growing up) https://en.m.wikipedia.org/wiki/Mortal_Engines https://en.m.wikipedia.org/wiki/Mortal_Engines tl;dr = Post apocalypse, cities are giant mobile machines that eat and integrate smaller cities to survive

gmuslera 1y ago
Crabs on the Island, by Anatoly Dneprov, fits better in the idea.
poulpy123 1y ago
More about grey goo (don't remember the source of the idea)