"Of exceptional importance. A genuine philosophy of nature, written by a physicist."-Hibbert Journal "Bohm's challenging book perhaps marks the beginning of a retreat from high-flown obscurantism and a return to common sense in science."-Scientific American "Bohm's ideas deserve careful study... Through the stimulus it will provide for the thoughtful investigation of some of the most searching questions of modern physical science, this book serves a very useful purpose."-Physics Today