text: i want to buy the feynman lectures on physics , should i get the 1989 or 2006 edition ? 1989 : 60$ 2006: 110$ 2006 ed. the main differences are that the 2006 ed has all the typos and equations fixed properly, and there is 'feynman's tips on physics' book included which is a very helpful book. the 1989 ed. is not the most recent one. (obviously!) which ever one you buy, you'll be happy