Apparently, it’s not enough to have produced the best-selling children’s book series of all time. The good folks at Scholastic, American publisher of the Harry Potter books, are launching a new ad campaign designed to draw adults of all demographics into the Hogwartian fold. A new series of print ads aimed at the 18-35 set, and specifically focusing on such voracious consumers of literature as bikers and skate punks, will begin running in select magazines this fall.