Dr. Ratey was seeing patients for ADD in the early 80's, when he accidently discovered the connection between physical activity and brain function.  John and a former student of John's, were able to self-diagnose their own ADD and realized that they were able to function by self-medicating, through physical activity. This connection of physical activity and brain function led John to a groundbreaking research on aggression, autism and ADD.  John talks to us about "Miracle Gro" for the brain and how to develop your brain, with activity, during all stages of life, as well as how to overcome the Seasonal Affective Disorder (SAD), that so many people deal with during the long winter months.  John has written 11 books, most notably; Go Wild: Free Your Body and Mind From the Afflictions of Civilization https://amzn.to/2L1JHUF and Spark: The Revolutionary New Science of Exercise and the Brain https://amzn.to/2JAalDk.