For American Heart Month, we're exploring various ways to nurture that all-important organ. In part 1, you'll meet Nathalis and Donna, a client-employee combination that proves when you put a little heart into your work, you get a lot back. In part 2, we talk to Dr. Richard Weiss, Clinical Cardiologist from the University of Pennsylvania Health Center, who details how far the science behind our hearts has come—and how far it still has to go.