From the reviews: "It appears to be written for advanced undergraduates and graduates in physics who are newcomers to biophysics and biochemistry. ... The book builds from Frauenfelder's sketches and hand-drawn diagrams, which impart to the volume a personal touch, to its major theme: Frauenfelder's insight that protein structures undergo conformational transitions - proteinquakes - through sub-states of approximately equal energy in a rugged, multi-dimensional, conformational-energy landscape." (H. Richard Leuchtag, Physics Today, May, 2011)