Mikael Hard is Professor of History at Darmstadt University of Technology. His books include The Intellectual Appropriation of Technology: Discourses on Modernity, 1900-1939 (coedited with Andrew Jamison; MIT Press, 1998). Thomas J. Misa is ERA-Land Grant Professor of the History of Technology at the University of Minnesota, where he directs the Charles Babbage Institute. His books include Modernity and Technology (coedited with Philip Brey and Andrew Feenberg; MIT Press, 2003).