As a graduate student in 1972, the author was part of the team that discovered the brain's opiate receptors. In this text, she provides an in-depth look at the science that led to this and other findings, such as the fact that similar receptors exist in the glands, spleen, bone marrow and other organs, which convey information in both directions via neuropeptides to all parts of the body. The author argues that this complex communications network invalidates the distinctions between mind and body. The text also discusses recent discoveries in cancer and AIDS research.