Today was the day when I took my classes to the school book fair. Sponsored by the PTA, it has been an annual tradition at our school since before I started. My students are always so excited to go and check out the merch in the makeshift bookstore set up in the library that it truly makes me question the fall of brick and mortar commerce. It's never the books that they want most, though-- most of their crumpled bills and sweaty coins go for posters, bookmarks, pencils, and other novelties such as this year's big seller, the chocolate calculator. For four bucks you got a little box that had either a calculator made to resemble a chocolate bar or a chocolate bar made to resemble a calculator; I'm still not sure which.