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Sep 19, 2016 at 13:57 comment added Mołot 'A human with four legs would definitely be more mobile than normal humans" - not really. Faster on plains, but far less mobile in woods, underground tunnels etc. And we need wood and coal and steel for civilization, so the kind of mobility they would gain wouldn't compensate for the kind they lost.
Sep 19, 2016 at 13:47 history answered Planarian CC BY-SA 3.0