ADD (Attention Deficit Disorder) and ADHD (Attention Deficit Hyperactivity Disorder) have been with mankind since Adam. Why is it only recently that it has become a problem? This is the question former psychotherapist Thom Hartmann asked. He then drew a logical conclusion, that ADD and ADHD are a result of natural adaptive behavior.

Thom Hartmann then proposed the hunter vs. farmer theory as a theory explaining ADHD.