Many health conditions that we contemporary humans consider to be unavoidable ills are actually not Normal occurrences in Human existence—common, but not normal. Consider acne vulgaris, a skin disorder affecting more than 90 percent of the western world, and malocclusion, a common misalignment of the upper and lower jaw. Only quite recently in our evolutionary history did these disorders became common. Among hunter-gatherers, they are rare.2, 4, 15 Scientific evidence…