Say you write a book and it takes off online. What if it then turned into a mega-hit ' say the movie rights were sold to a Hollywood studio and Matt Damon was cast to star in it? Don't believe it can happen? Listen to this ' This is Andy Weir's story, and in this podcast he explains exactly how it happened. Oh, and you should go read his book, The Martian ; it's really great. In this episode of Authorpreneur,...