John C. Rock, a Harvard professor of gynecology, was the co-inventor of the birth control pill and a pioneer of in-vitro fertilization. Harvard's Center for the History of Medicine is holding an exhibition of his papers and artifacts, including two devices to help with "family planning" during a time when the only legal form of birth control in Massachusetts was the rhythm method. Above is "The Rythmeter," circa 1944. "A Pioneer in Family Planning" (via Mother Jones)
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.