This is the best paragraph that I’ve read all day:

Today many sociologists and neuroscientists believe that regardless of A.D.H.D.’s biological basis, the explosion in rates of diagnosis is caused by sociological factors — especially ones related to education and the changing expectations we have for kids. During the same 30 years when A.D.H.D. diagnoses increased, American childhood drastically changed. Even at the grade-school level, kids now have more homework, less recess and a lot less unstructured free time to relax and play. It’s easy to look at that situation and speculate how “A.D.H.D.” might have become a convenient societal catchall for what happens when kids are expected to be miniature adults. High-stakes standardized testing, increased competition for slots in top colleges, a less-and-less accommodating economy for those who don’t get into colleges but can no longer depend on the existence of blue-collar jobs — all of these are expressed through policy changes and cultural expectations, but they may also manifest themselves in more troubling ways — in the rising number of kids whose behavior has become pathologized.