In the second section of his book, he switches the topic to the revolutions that shaped the way you and I live today, the agricultural and industrial revolutions. ![]() Here, he spends time talking about the way they lived and the furtherment of adaptations that helped hunter-gatherers. After Lieberman discusses the morphological features that make humans different, he moves onto hunter-gatherer societies. He also discusses a few theories for why we evolved into complete bipeds since we are the only species that habitually walks on two legs. ![]() Starting off with the evolution of bipedalism, he assess the anatomical differences between modern humans, past hominins, and apes. ![]() To understand how mismatched diseases work, and why we are not evolved for today's environment, Lieberman moves through the series of biological evolutions and cultural evolutions our species has progressed (or regressed) through.
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