Wednesday, September 16, 2026, 10:00 am EDT
Wednesday, September 16, 2026, 12:00 pm EDT
Thursday, September 17, 2026, 2:00 pm EDT
Thursday, September 17, 2026, 3:00 pm EDT
Max Planck Institute for the History of Science
Thursday, September 17, 2026, 3:00 pm EDT
Johns Hopkins University
Friday, September 18, 2026, 12:00 pm EDT
Wednesday, September 23, 2026, 10:00 am EDT
Wednesday, September 23, 2026, 5:45 pm EDT
American Institute of Physics
Thursday, September 24, 2026, 1:00 pm EDT
Thursday, September 24, 2026, 3:00 pm EDT
Johns Hopkins University
Thursday, August 13, 2026, 10:00 am EDT
Monday, August 10, 2026, 6:00 pm EDT
American Philosophical Society
Thursday, August 6, 2026, 9:00 am EDT
Science History Institute
Tuesday, August 4, 2026, 8:00 am EDT
Wednesday, July 22, 2026, 12:00 pm EDT
Wednesday, July 22, 2026, 10:00 am EDT
Tuesday, July 21, 2026, 2:00 pm EDT
Tuesday, July 21, 2026, 3:00 am EDT
Max Planck Institute for the History of Science
Friday, July 17, 2026, 12:00 pm EDT
Monday, July 13, 2026, 6:00 pm EDT
Science History Institute, College of Physicians of Philadelphia
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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