Lee Ellis is a semi-retired American researcher whose last position was that of a visiting professor in the Department of Anthropology and Sociology, at the University of Malaya, Kuala Lumpur, Malaysia.Craig T. Palmer is a semi-retired associate professor in the Department of Anthropology at the University of Missouri, Columbia, Missouri, USA.Rosemary Hopcroft is a professor in the Department of Sociology at the University of North Carolina, Charlotte, North Carolina, USA.Anthony W. Hoskin is a professor in the Department of Sociology, Social Work, and Criminology, at Idaho State University, Pocatello, Idaho, USA.

• 24. Theories Pertaining to Why Universal Sex Differences Might Exist 25. Sex Difference Variables with Ten or More Findings 26. Identifying and Theoretically Explaining Each Potential Universal Sex Difference 27. Tabular Listings of the Universal Sex Differences in Order of the Evidentiary Strength 28. Epilogue

Lee Ellis is a semi-retired American researcher whose last position was that of a visiting professor in the Department of Anthropology and Sociology, at the University of Malaya, Kuala Lumpur, Malaysia.Craig T. Palmer is a semi-retired associate professor in the Department of Anthropology at the University of Missouri, Columbia, Missouri, USA.Rosemary Hopcroft is a professor in the Department of Sociology at the University of North Carolina, Charlotte, North Carolina, USA.Anthony W. Hoskin is a professor in the Department of Sociology, Social Work, and Criminology, at Idaho State University, Pocatello, Idaho, USA.

• 24. Theories Pertaining to Why Universal Sex Differences Might Exist 25. Sex Difference Variables with Ten or More Findings 26. Identifying and Theoretically Explaining Each Potential Universal Sex Difference 27. Tabular Listings of the Universal Sex Differences in Order of the Evidentiary Strength 28. Epilogue

Lee Ellis is a semi-retired American researcher whose last position was that of a visiting professor in the Department of Anthropology and Sociology, at the University of Malaya, Kuala Lumpur, Malaysia.Craig T. Palmer is a semi-retired associate professor in the Department of Anthropology at the University of Missouri, Columbia, Missouri, USA.Rosemary Hopcroft is a professor in the Department of Sociology at the University of North Carolina, Charlotte, North Carolina, USA.Anthony W. Hoskin is a professor in the Department of Sociology, Social Work, and Criminology, at Idaho State University, Pocatello, Idaho, USA.

• 24. Theories Pertaining to Why Universal Sex Differences Might Exist 25. Sex Difference Variables with Ten or More Findings 26. Identifying and Theoretically Explaining Each Potential Universal Sex Difference 27. Tabular Listings of the Universal Sex Differences in Order of the Evidentiary Strength 28. Epilogue