I am writing a book about increasing productivity at the workplace. I also have a blog that is about a wide range of topics. I have just started writing the book, but to increase the reader base I am writing blog articles that are on the same lines as my book. I want to ask, how can I write blog articles which when read are not similar to the content of the book. I mean if a publisher finds the ideas published somewhere else which are for free, they won't publish my book (that's what I am thinking). I just want to ask, how can I make the difference?