Attention deficit hyperactivity disorder (ADHD) is a medical condition that affects around 8.4 percent of US children and 2.5 of adults. People with ADHD often have differences in their brain structures and neurological activities that negatively impact their attention span and impulse control. Like many other neurological conditions, the exact causes of ADHD are not entirely clear. Experts know that several factors, including genetic predispositions, issues in the central nervous system, and environmental triggers like exposure to certain toxins, play...