Allot has changed since you were a teacher. ADHD does exist now. Your right though it probably didn’t back then. We have an epidemic of neurological disorders and mental disorders. The one thing I question is today’s vaccine schedule. Hmmm coincidence? 49 doses of 16 vaccines by age 6. When I was a kid it was a third of that. I never seen any autism in my school either, or severe behavior/mental disorders. Be in my shoes for a week or a month and around my daughter who has ADHD, you will realize it does truly exist. Caused by environmental, pharmaceutical, GMO’s?