In BS 137 neuroscientist Seth Grant describes his surprising new discovery that brain complexity is controlled by a "genetic lifespan calendar" that determines the timing of brain changes through out the lifespan. We also explore the exciting implications of this discovery. Please visit http://brainsciencepodcast.com for detailed show notes and episode transcripts. Our new sponsor is The Great Courses Plus. For a free month of video streaming and downloads go to http://thegreatcoursesplus.com/ginger.   Note for Premium Subscribers: The episode transcript for BS 137 will be released later this week.