"The Babylonians were the original liver guys, believing the organ to be the source of human emotion and spirit. The Mesopotamians played both sides of the argument, assigning emotion to the liver and intellect to the heart. These guys clearly marched to the beat of a freethinking drummer, for they assigned a further portion of the soul (cunning) to the stomach. Similar freethinkers throughout history have included Descartes, who wrote that the soul could be found in the walnut-sized pineal gland, and the Alexandrian anatomist Strato, who decided it lived "behind the eyebrows."