. >> i stumbled across this story about joseph priestley and i knew a little bit about briefly. like most people i think i'd heard about him is the guy who i discovered oxygen for the first time. and for those of you who know the story of had a chance to look at the book. that is his representation as he didn't do didn't do a first in a kind of got it wrong in some fundamental ways than he did do it. but for some reason that the line that is kind of stuck within and that's the first sentence of his britannica entry in his wikipedia entry is he the guy who discovered oxygen. i found out this other very interesting thing about him which i think he deserves a lot more credit for an part of this book is evangelizing this one discovery of his career, which is that he was the first person to realize that plans were creating oxygen. >> host: to michigan we go and this is just on our independent line. her favorite nonfiction book of 2009. >> caller: good morning, merry christmas. my favorite book is called thomas freedman, the world is flat. it has marvelous theories about putting much