Ray Kurzweil has been an advocate of Artificial Intelligence for decades now. He has done several talks and written several articles on AI. This book is focused around the idea of Hierarchical Hidden Markov Models and how HHMM’s can solve the problems our mind has to deal with. HHMM’s have been very successful in solving speech to text problems. This is a good read if you want to get an insight on how some of these big names are looking at AI.