Here is a new book that supports Adler, but taking an exacting look on the scientific studies of the great apes,etc.-http://www.spiked-online.com/index.php/site/reviewofbooks_article/7087-The jump in cognition from ape to human is one of the major reasons I think there is a greater power. Another leg is the enormous complexity of living biochemistry and how DNA as an underlying code is used. In a sense DNA is simple compared to the molecular dance around it.-http://www.nature.com/news/2009/090904/full/news.2009.880.html