Scientific American’s Winter 2015 Special Edition, entitled “Physics at the Limits,” is a collection of articles by physicists and physics journalists describing the current status of efforts to solve the deepest mysteries of the universe. Some of these problems have been worked on for decades and are no closer to being solved. Ideas that looked promising and inspired hope years ago haven’t panned out. I found the overall tone of the issue somewhat downbeat. Nobody is predicting that success is just around the corner.