About the Cover

Light, the Nexus in Physics Blue light-emitting diodes, a photo by Gussisaurio, is presented here in honor of the 2014 Nobel Prize in Physics, awarded jointly to Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura “for the invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white light sources.” On page 20, we explore “Light, the Nexus in Physics” with Dwight E. Neuenschwander.