Announcing eight new working groups this semester! Working groups meet online for stimulating and collegial discussion of works-in-progress as well as important publications in specialized fields in the history of science, technology and medicine. Sign up for one or more groups now, and join the conversation.

See all currently active groups.

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First-Photo

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.