Can there be rational examples of the compatibility between natural science and Judaism? This book offers a strikingly novel perspective on traditional and contemporary Judaic practices. For those with some Judaic knowledge, there are biological explanations in these chapters not seen elsewhere. For those well-versed in evolutionary theory, the authors’ perspectives suggest new approaches to the scientific study of religion. Topics include the monistic tendency, biblical polygyny, biblical family conflict, circumcision and proselytes, sacrificial-ritualistic mitzvot (obligations), periodic conjugal separation, Judaic traditionalism, male and female reproductive strategies, and the relationship between costly signaling and prestige.