From an evolutionary perspective, our legs are in a rather unusual position - you could say they’re stuck halfway through development. Our closest relatives, primates, have leg anatomy that isn’t drastically different from ours, yet they use their legs for grasping and climbing trees. In contrast, the primary function of human legs is upright walking. The issue is that humans transitioned to bipedalism relatively quickly in evolutionary terms. Our legs simply didn’t have enough time to fully ada

Altruism