FOR THE second year running “And Tango Makes Three”, a children's book, has topped the American Library Association's list of “Ten Most Challenged Books”. The tale of two male penguins adopting an orphaned egg provoked more written complaints to libraries and schools in 2007 than any other book. Inappropriate sex, homosexuality and atheism are the most common reasons for complaints. Mark Twain's “Huckleberry Finn” has been accused of racism. Despite the ban requests, most challenges are unsuccessful.

AP