A growing number of students are participating in adult-style book clubs aimed at building enthusiasm for reading. The clubs are moderated by adults, who select the books and help students hone in on new words and their meanings and encourage a love of reading among students. "I look for books with a challenging vocabulary. I love getting into the etymology of the words. But it's really all about making them love books," said Nicholas Baker, who runs four book clubs for children in the San Francisco area and has waiting lists for more clubs.