Tuesday, October 25, 2016, 4:15 pm EDT
Monday, October 24, 2016, 5:00 pm EDT
Chemical Heritage Foundation (Philadelphia, PA)
Friday, October 21, 2016, 5:40 pm EDT
Rutgers University (New Brunswick, NJ)
Friday, October 21, 2016, 10:00 am EDT
Thursday, October 20, 2016, 11:00 pm EDT
Chemical Heritage Foundation (Philadelphia, PA)
Thursday, October 20, 2016, 11:00 pm EDT
Philadelphia Area Seminar on History of Mathematics (Villanova, PA)
Thursday, October 20, 2016, 9:00 pm EDT
Smithsonian National Air and Space Museum (Washington, DC)
Thursday, October 20, 2016, 6:38 pm EDT
American Philosophical Society (Philadelphia, PA)
Thursday, October 20, 2016, 5:30 pm EDT
Thursday, October 20, 2016, 5:00 pm EDT
American Philosophical Society (Philadelphia, PA)
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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