I mean I'm somewhat interested in how the Wizarding world manages to keep hidden despite all the kids from the muggleworld supposedly having friends and connections and things before Hogwarts.
I mean, which 11-year old wouldn't want to tell their friends they're special? Hmm.. perhaps ones which fear some sort of "witch-hunt" if they out themselves as being different?
How about why don't muggles just address the weird looking wizards who they see on the streets (at least in book 1 chapter 1) and on King's Cross station. I mean, I can always spot a wizard.