ASPIES ARE JUST WEIRD
Individuals with Asperger's tend to have rigid routines and dislike change. For instance, they might be very particular about how they have food arranged on their plate, their items set up on a shelf, the uniformity of grass blades in the yard, etc.
The DSM-IV criteria for Asperger’s Disorder and autism are identical, requiring the presence of at least one symptom from this category. The most commonly seen symptom in Aspies is an all-absorbing preoccupation with an unusual and very narrow topic (e.g., trains, dinosaurs, names of stars, maps, TV guides, airline schedules, etc.).
A person with Asperger's will usually know the topic inside and out and want to talk about it all the time during social interactions. Although this symptom might not be easily recognized in children—since strong interests in one topic are so common—it might become more salient with age, as interests shift to odd and narrow topics. The topics may change every year or two, but the intensity with which they are studied remains the same.