I totally love that article. Toddlers who ask questions are awesome; I don't even know if I asked so many questions when I was that age.
That the daughter had such a dad is also really cool.
What many parents don't realize is that kids have good BS detectors and inconsistency is bad influence on their reasoning. And answers like "just because" are among the worst.
http://www.scq.ubc.ca/?p=657