1. Janet Dora Hine Professor of Politics, Governance and Ethics, Department of History and Charles Perkins Centre, Quadrangle A14, University of Sydney, Sydney, NSW 2006, Australia; warwick.anderson@sydney.edu.au.
2. Janice and Julian Bers Professor of the History and Sociology of Science, Department of the History and Sociology of Science, University of Pennsylvania, Cohen Hall Suite 303, 249 South 36th Street, Philadelphia, PA 19104, USA; mlindee@sas.upenn.edu.