Enlarge Image Self-healing? After a heart attack like this patient has suffered, cells in the heart might be able to make new muscle, a mouse study suggests. Credit: Fotosearch Heart attacks kill because they strangle heart muscle, destroying cells and preventing the organ from pumping properly. Now, researchers reveal that they have nudged cells within mouse hearts to repair some of the damage, a discovery that might prompt new treatments for heart attacks in humans. Researchers are probing several ways to encourage the heart to fix itself. Last year, for instance, cardiac stem cell biologist Deepak Srivastava of the...