James Byrne appreciates a well-made cappuccino, but not because he’s a connoisseur of espresso drinks. He’s more interested in the foam. For Byrne, MD, PhD, an assistant professor in the University of Iowa Carver College of Medicine Department of Radiation Oncology, it’s using foam—and creams, hydrogels, and solids—to create new, biocompatible materials that may improve the effectiveness of…