MEXICO CITY (AP) — A young Mexican's fascination with Harry Potter has grown into the world's biggest private collection of toys, books, clothes and other items related to author J.K. Rowling's fantasy hero. The collection belonging to real estate lawyer Menahem Asher Silva Vargas has been certified by Guinness Awards as the largest anywhere. [...] it is on display at the Mexican Museum of Antique Toys in Mexico City.