Yeah--it was well-written, easy to understand. Which might be why, actually...explaining fairly sophisticated reasoning and research in such a breezy tone. Leads to the reader (me, anyway) going, "Jeez, why didn't I think of that? And why aren't I thinking of such things all the time?" (Answer: Because you are not Steven Levitt, you are only sitting in a Border's with crumbs on your shirt.)

I particularly liked the part about the Israeli daycare that charged fees for late pick-ups.