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Why blood mystified doctors for centuries

For something that’s inside all of us, it’s taken physicians several millennia to understand blood. Dr. Dhun Sethna is a clinical and academic cardiologist. He joins host Krys Boyd to discuss how slowly advancements in our knowledge of blood circulation and the heart progressed, and where these discoveries have taken medicine today. His book is “The Wine-Dark Sea Within: A Turbulent History of Blood.”