Leonardo da Vinci looked at the human heart and didn’t just see an organ; he saw a masterpiece of fluid dynamics. He sketched swirling vortices and intricate spirals within the ventricles—patterns that medical “science” largely ignored for centuries, dismissively viewing the heart as a simple mechanical pump. It took 500 years and advanced MRI technology for modern cardiology to catch up. In 2013, researchers confirmed exactly what Leonardo’s quill had captured: blood doesn’t just “flow”—it spirals in a beautiful, coherent dance.