We started in the introduction with a question: why is the human body so uniquely prone to aches and pains? In some instances, the answers were logical and more obvious, like in the case of back pain. You cannot take a horizontal spine and make it vertical and not expect a few problems. In other cases, the answers were more complex and confusing. For example, we still do not have a complete picture of the historical underpinnings of human fertility issues.
