Lorraine Daston is Director at the Max Planck Institute for the History of Science in Berlin, Germany. She is the coauthor of Wonders and the Order of Nature, 1150-1750 and the editor of Things That Talk: Object Lessons from Art and Science (both Zone Books). Peter Galison is Pellegrino University Professor of the History of Science and of Physics at Harvard University. He is the author of Einstein's Clocks, Poincare's Maps: Empires of Time, How Experiments End, and Image and Logic: A Material Culture of Microphysics, among other books, and coeditor (with Emily Thompson) of The Architecture of Science (MIT Press, 1999).