The whole thing was basically an experiment Richard Feynman said late in his career looking back on the origins of his lectures The experiment turned out to be hugely successful spawning publications that have remained definitive & introductory to physics for decades Ranging from the basic principles of Newtonian physics through such formidable theories as general relativity & quantum mechanics Feynman's lectures stand as a monument of clear exposition & deep insight Timeless & collectible the lectures are essential reading not just for students of physics but for anyone seeking an introduction to the field from the inimitable Feynman