Wednesday, April 22, 2015, 11:30 pm EDT
New York Botanical Garden
Wednesday, April 22, 2015, 9:30 pm EDT
History of Science and Philosophy Colloquium, Princeton University
Tuesday, April 21, 2015, 9:15 pm EDT
Haverford College Libraries and Haverford College Department of History
Tuesday, April 21, 2015, 4:30 pm EDT
Monday, April 20, 2015, 8:30 pm EDT
University of Pennsylvania, History and Sociology of Science, Speaker Series
Friday, April 17, 2015, 6:00 pm EDT
Thursday, April 16, 2015, 11:00 pm EDT
UPenn Bookstore
Thursday, April 16, 2015, 11:00 pm EDT
The Philadelphia Area Seminar on History of Mathematics
Thursday, April 16, 2015, 9:30 pm EDT
UPenn, Program in Visual Studies and History and Sociology of Science
Wednesday, April 15, 2015, 5:30 pm EDT
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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