J. Caleb Spence of Midlothian, 12, test drives the latest model of the daVinci® Surgical System at a Johnston-Willis Hospital open house while Adam Wimmer, Intuitive Surgical, tells onlookers about how the robot can help physicians perform minimally invasive surgeries for hysterectomies, prostatectomies, and other gynecological and urological procedures.  | photo courtesy of J.C. Sadler