Modern culture tends to separate medicine and miracles, but their histories are closely intertwined. The Roman Catholic Church recognizes saints through canonization based on evidence that they worked miracles, as signs of their proximity to God. Physicianhistorian Jacalyn Duffin has examined Vatican sources on 1400 miracles from six continents and spanning four centuries. Overwhelmingly the miracles cited in canonizations between 1588 and 1999 are...