Scientists have developed a new technique for "patching" damaged hearts. Healthy heart cells are taken from a patient, allowed to grown on an organic "scaffold", and then implanted in the abdomen, where they grow and develop blood vessels. When the result is implanted in the heart, it integrates and synchronizes its beating, effectively healing the damage.

At least, that's the way it works in mice. It's hoped the technique will also work in humans, providing hope for millions of heart attack victims.