DS took a while to ask why questions...most often it was 'how questions', like Mk13's DS. He does ask 'why' now but we don't really get "why is the sky blue" type questions, for the most part. I also wondered about that phenomenon, how some gifties are 'why why why' and others not - but then again, it seems like any time you try and pigeon-hole your kid into a gifted description, it ends in failure. (for a fun example, Ruf says that gifted infants don't mouth toys, or chew on books. tell that to my DS who LITERALLY ate hunks out of his board books. But now I'm straying off topic. :D)