The answer, of course, is this same chain of effect: technology (bones, muscles, neurons) leading toward specialization (the femur, biceps, and femoral nerve) leading toward cooperation (all those parts and many more leading to our bipedal verticality) leading toward greater complexity (every novel possibility that sprung from our upright stance). But the story doesn’t end here. In the words of Robert Wright, author of Nonzero: The Logic of Human Destiny, “Next humans started a completely second kind of evolution: cultural evolution (the evolutions of ideas, memes, and technologies).
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