Neuroscientists point out that the complex mixture of DNA we inherit from our parents, as well as the roughly 70 spontaneous genetic mutations we acquire by chance, subconsciously dictate our behavior far more than we realize. Genes to some extent determine our life choices. 　　Stephenson, 73, who is part neuroscientist and part philosopher, is increasingly convinced that the complex concoction of DNA we inherit from our parents, along with the roughly 70 or so spontaneous genetic mutations we acquire by chance, subconsciously dictates There is so much more to our behavior than we realize. Genes to some extent determine our life choices. 　　 We may not realize it, but many…