http://www.feynmanlectures.caltech.edu/
http://www.openculture.com/2014/08/...-book-ever-written-now-completely-online.html
http://www.openculture.com/2014/08/...-book-ever-written-now-completely-online.html
Last fall, we let you know that Caltech and The Feynman Lectures Website joined forces to create an online edition of The Feynman Lectures on Physics. They started with Volume 1. And now they’ve followed up with Volume 2 and Volume 3, making the collection complete.