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.
Tuesday, May 6, 2014, 6:00 pm EDT
Tuesday, May 6, 2014, 5:15 pm EDT
University of Delaware
Tuesday, May 6, 2014, 5:00 pm EDT
Chemical Heritage Foundation
Thursday, May 1, 2014, 9:30 pm EDT
Laurence Stone Lectures, Princeton University
Thursday, May 1, 2014, 8:00 pm EDT
Johns Hopkins University
Thursday, May 1, 2014, 4:30 pm EDT
Thursday, May 1, 2014, 12:00 am EDT
The Academy of Natural Sciences of Drexel University
Wednesday, April 30, 2014, 11:30 pm EDT
Barbara Bates Center
Wednesday, April 30, 2014, 9:30 pm EDT
Laurence Stone Lectures, Princeton University
Wednesday, April 30, 2014, 5:00 pm EDT
Barbara Bates Center, University of Pennsylvania
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