Surgeons in Los Angeles have for the first time performed a life-saving procedure on a tiny fetus inside its mother’s womb after practicing on a grape. Using a hair-fine wire, a miniature needle, a tiny balloon and a catheter, they successfully carried out the operation on the unborn child’s heart—which is about the size of a walnut. It was a medical first for the surgical team at CHA Hollywood Presbyterian Medical Center in Los Angeles, and according to the LA Times, it appears to have been a success. … Practicing for such a critical and exacting procedure, remarkably, involved using...