Peter Wade is Professor of Social Anthropology at the University of Manchester.Carlos López Beltrán is a historian of science and senior researcher in the Instituto de Investigaciones Filosóficas, Universidad Nacional Autónoma de México.Eduardo Restrepo is a social anthropologist working in the Department of Cultural Studies at the Pontificia Universidad Javeriana in Bogotá.Ricardo Ventura Santos is an anthropologist and senior researcher at the National School of Public Health of the Oswaldo Cruz Foundation in Rio de Janeiro and Associate Professor of Anthropology with the National Museum at the Federal University of Rio de Janeiro.