To be honest, I don't normally read biographies. When I read, I read to escape the real world and all of the problems I seem to have with it. I normally don't want to read about someone else's problems. If I do pick up some non-fiction, it is normally historical or something mythological. I actually once read The Science of Jurassic Park and the Lost World. All kinds of DNA information with a lot of BIG words that I'm still not sure if I understand.
In any case, when I read I want to KNOW everything is fictional, even if the story is about most of the world going crazy because of cell phones.
And just to let you know what I'm reading now: currently I'm reading The Library Policeman, a short novel in the book Four Past Midnight by Stephen King. Yes another novel by Mr. King. I tend to get on author kicks and read a few things by the same author in a row. Although, after this one I think I will read Arrow's Fall, book 3 in the Heralds of Valdemar series, by Mercedes Lackey.
I need something a little more cheerful after all the blood and gore.