now, is that document a true reflection of the way eddison thought about tobacco smoking? no. it's not. the biographer takes into account the fact that every document they scrutinize is going to have an agenda of some sort or other. when i was writing my biographies of roosevelt, who was one of the most articulate of writers. he was a gifted, perpetwait writing machine pouring out his soul, and in 150,000 letters in his short life, countless magazine articles, no one has tab bylated how much he wrote. i based all my biographies on this archive of authentic self-expression by an extremely honest literary person, but i notice time and time again that letters written to different people at different times gave totally different versions of different subjects because of his consciousness that he was addressing himself to the recipient. we, biographers, will base more contemporary biographies on recordings of interviews, presumably the transscript of an interview with ronald reagan or richard nixon is text, is the authentic words that the president spoke right there on the page, bl