Erwin Schr dinger's 1944 classic What Is Life? is a small book that occupies a large place among the great written works of the twentieth century. It is said that it helped launch the modern revolution in biology and genetics, and inspired a generation of scientists, including Watson and Crick, to explore the riddle of life itself. Now, more than sixty years later, science writer Ed Regis offers an intriguing look at where this quest stands...