I am Ryan Swanson, author of *The Santa Talk*. For 7 years, I interviewed parents, kids, ex-kids, teachers, and PhDs about how kids find out about Santa and how parents handled it. AMA!
In the fall of 2006, my older brother called me from Minnesota to say that my then-seven-year-old niece/goddaughter had started to ask him serious questions about Santa. "How's he get everywhere in 1 night?" "But we don't have a chimney...?" Etc. I told him to look for a book. He said he'd done that and there were none. I spent the next 7 years interviewing adults, kids, and experts about their experiences with the moment kids learn the truth about Santa and how parents handled it. From their stories, I wrote The Santa Talk.
PROOF- There is a special blog regarding today's AMA at the book's site: http://thesantatalk.com/blog/
Edit: Thank you for your questions. Merry Christmas! I am typed-out but will try to check back soon.