“Leathery” complexions are often hallmarks of having spent too much time in the sun—whether in the real deal or the tanning booth. Binghamton University researchers have looked more closely at this issue. Their study, published in the Journal of the Mechanical Behavior of Biomedical Materials, explores how ultraviolet radiation can alter the microstructure of human skin. According to the team, particularly affected is collagen, the fibrous protein that binds together tissue, tendon, cartilage an...