Geek, nerd, the weird kid. Every schoolyard has a couple: the kids on the fringes who play alone and have obsessive interests in say astronomy or insects. It's painful for these kids who just don't fit in and for their families who aren't sure how to help. But we are now learning that this kind of behaviour could be a sign of a kind of high-functioning autism known as Asperger's syndrome. Thousands of adults may have grown up with Asperger's and not known it. It's tough to diagnose and wasn't even defined until the mid-90's. This special episode of Planet Parent looks...