Yeah, when a science-fiction writer who was quoted as saying "If you ever want to make a million dollars, start your own religion" suddenly comes up with something like Scientology, you might wanna take it with a grain of salt. A great site on this is operationclambake.com
Regarding ADD, I completely agree. When I was a kid in Catholic school, they didn't hand out Ritalin, they locked you in a closet for several minutes. Worked better than any ADD meds they have out on the market. The problem is permissive parenting. The kids come to school and have never been taught how to behave properly or disciplined. The best thing is that now with this ADD craze, the kids with ADD are permitted to stand up and walk around the classroom and engage in disruptive behavior because that is part of the "illness', so the rest of the children have to suffer because one child can't behave.
And here's a newsflash, EVERY kid has trouble concentrating on Science for 45 minutes. It is a learned skill, not something that comes naturally to ANY child.