The thumb thing s irrelevant because the people with the most dextrous thumbs, muscular biceps etc. must obviously usee them a lot. Hasn't La Marck taken a lot of shit for advancing a theory like this? Anywho, humans will never evolve past the present state. We can't become superpowerful gods if we all try hard and "transcend a plane" or some such New age hoohockey.
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