Almost a century ago Vassar professor Lucy Maynard Salmon (1853-1927) started down an intellectual path that made her one of the most innovative historians of all time. Her historical method relied on extensive use of the documents of everyday life. In class, for example, she surprised her students with laundry lists, grocery receipts, and newspapers, and asked them to interpret these "ephemera" as historical documents. What did the laundry receipts tell about those who used such services? About those who ran such establishments? About systems of domestic service? Business organization? In...