The use of sound or acoustic energy in medicine has evolved from the ancient diagnostic method used by ⁠Hippocrates by placing his ear to the chest. However, we had to wait 2,000 years for the invention of the ⁠stethoscope⁠. Today, acoustic energy is used in diagnostic imaging called ultrasound that has revolutionized obstetrics and cardiology, while therapeutic applications of sound have resulted in shockwave lithotripsy to break up kidney stones, destroy tumors. This episode explores new uses of sound energy.