I got into the world of machine learning when I saw the Jeopardy video by IBM. It’s a small video but if you want to know how all that happened –read this book. What I love about this book is that it has some great pointers if you are building a question answering system. It talks about the hard work IBM team put in to build Watson. It shows how by improving module by module you can achieve something as complex as Watson. After reading this book I realized that Watson was trained not to mention certain forbidden & embarrassing answers even if they had a very high probability!!