I currently have a couple of English majors helping to edit my latest book, which is non-fiction. There has been a debate over whether I should use contractions or not. One feels that it makes the book too "formal", while the other feels that contraction usage is a no-no. Any thoughts on this? Does the usage of contractions take away from reading enjoyment or does the lack of them make a book too stuffy? I want just average, ordinary people to be able to pick the book and enjoy it, but I also don't want to have a literary person trash it because of grammar style.