"Who, if anyone, prior to Blalock and Thomas attempted open heart surgery?"
"Between Galen and the Renaissance (say 1450AD), what evidence do we have for how Galenic humorism was applied by physicians in the Christian West, esp England and France?"
"In the West, physicians and surgeons were distinguished back into antiquity, and were being distinguished as late as the 18th century. How and when did the two professions merge?"
Proposal: History of Science And Mathematics