okay then i'm starting with adhd and similar disorders. uh, you have to have symptoms of adhd in childhood (like, before 15 or smthg). it has to interfere with daily life, but for at least 6 months and in 2 settings (if its just one, it could be purposeful acting-out). both have a list of symptoms that you have to meet a certain number of, but I can remember specific instances of all but like 1 from each list.
i think its odd, oppositional defiant disorder, thats easy to mistake for adhd. similar disruptive behaviors
learning disorders are a whole huge mess thats really fascinating too. autism, especially Aspergers, is really cool. i have a super smart friend whos autistic. he doesn't get people, and he can seem aloof. he's really good at expressing his thoughts, which indicates aspergers, so he might just be highly introverted. also, he was the smartest on my team, and he was basically what took us to global competitions. he just doesn't do people