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.
Wednesday, April 17, 2013, 2:00 pm EDT
Pennsylvania Hospital
Tuesday, April 16, 2013, 10:30 pm EDT
Jefferson University History of Medicine Series
Tuesday, April 16, 2013, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Monday, April 15, 2013, 8:30 pm EDT
Department of the History and Sociology of Science, University of Pennsylvania
Thursday, April 11, 2013, 11:30 pm EDT
Hagley Museum and Library
Thursday, April 11, 2013, 8:00 pm EDT
Johns Hopkins Program in the History of Science, Medicine and Technology
Wednesday, April 10, 2013, 5:00 pm EDT
Barbara Bates Center, University of Pennsylvania
Tuesday, April 9, 2013, 5:00 pm EDT
Chemical Heritage Foundation, Brown Bag Lecture
Tuesday, April 9, 2013, 4:00 pm EDT
Monday, April 8, 2013, 8:30 pm EDT
Department of the History and Sociology of Science, University of Pennsylvania
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