Friday, February 28, 2014, 12:00 am EST
Hagley Museum and Library
Thursday, February 27, 2014, 8:00 pm EST
Johns Hopkins University
Wednesday, February 26, 2014, 5:00 pm EST
Barbara Bates Center, University of Pennsylvania
Tuesday, February 25, 2014, 10:30 pm EST
Department of History & Politics, Drexel University
Tuesday, February 25, 2014, 8:30 pm EST
Drexel University, Department of History and Political Science
Tuesday, February 25, 2014, 5:00 pm EST
Chemical Heritage Foundation, Brown Bag Lecture
Tuesday, February 25, 2014, 4:00 pm EST
RCHA Tuesday Morning Seminar Series, Rutgers University
Monday, February 24, 2014, 8:30 pm EST
Department of the History and Sociology of Science, University of Pennsylvania
Thursday, February 20, 2014, 8:00 pm EST
Philadelphia Area Seminar on the History of Mathematics, Villanova University
Thursday, February 20, 2014, 8:00 pm EST
Johns Hopkins University
Philadelphia Central High School for Boys and Pennsylvania State Arsenal, 1839. This daguerreotype, created by Joseph Saxton, is the oldest known photograph taken in the United States. Image courtesy of the Historical Society of Pennsylvania.
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