Bloodletting is one of the oldest medical practices, having been practiced since ancient times, including the Mesopotamians, the Greeks, the Mayans, and the Aztecs. In Greece, bloodletting was standard practice around the time of Hippocrates and Herophilos. Herophilos (335-280 BC) was a Greek physician who was the first scientist to systematically perform scientific dissections of human cadavers and is deemed to be the first anatomist. Hippocrates of Cos (460BC-370BC) was also a Greek physician and is referred to as the "father of medicine." He was the first physician to reject superstitions,...