The Enovid contraceptive pill was the result of a convergence between the experimental biology of Min Chueh Chang — who demonstrated that oral progesterone suppressed ovulation in mammals —, the scientific direction of Gregory Pincus, the clinical trials of John Rock in Puerto Rico and Boston, and the decisive funding of Katharine McCormick. The FDA approved it for contraceptive use in 1960. The historical canon tends to simplify this convergence under Pincus's name, especially silencing Chang's contribution.