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 16, 2014, 5:00 pm EDT
Barbara Bates Center, University of Pennsylvania
Tuesday, April 15, 2014, 5:15 pm EDT
University of Delaware
Tuesday, April 15, 2014, 4:00 pm EDT
RCHA Tuesday Morning Seminar Series, Rutgers University
Thursday, April 10, 2014, 11:30 pm EDT
Chemical Heritage Foundation
Thursday, April 10, 2014, 11:00 pm EDT
Hagley Museum and Library
Thursday, April 10, 2014, 8:00 pm EDT
Johns Hopkins University
Thursday, April 10, 2014, 10:00 am EDT
Thursday, April 10, 2014, 9:00 am EDT
Wednesday, April 9, 2014, 5:00 pm EDT
Tuesday, April 8, 2014, 11:00 pm EDT
The Initiative for the Study of Public Health Ethics & History, The Center for Science, Technology & Society, and the Academy of Natural Sciences of Drexel University
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