How Much of a Work It Is Really to Write a Book?

So this is your fourth book if I'm not mistaken. So why did you decide to write yet another book? What was your motivation behind this one? You know this is the research I've been doing for the past decade or so even before I came out with the catalyst my last bookThis on the academic side was what I was doing a bunch of work on and you know a few things have changed in the past 10 or 15 years.