Scientific experimentation with humans has a long history. Combining elements of history of science with history of medicine, The Uses of Humans in Experiment illustrates how humans have grappled with issues of consent, and how scientists have balanced experience with empiricism to achieve insights for scientific as well as clinical progress. The modern incarnation of ethics has often been considered a product of the second half of the twentieth century, as enshrined in international laws and codes, but these authors remind us that this territory has long been debated, considered, and revisited as a fundamental part of the scientific enterprise that privileges humans as ideal subjects for advancing research.