Carl Sagan seems a pretty complex guy for a picture book, but Stephanie Roth Sisson manages to make his life accessible to kids in her biography, STAR STUFF: CARL SAGAN AND THE MYSTERIES OF THE COSMOS. Sisson traces Sagan's life from his boyhood, growing up in the Bronx and attending the 1939 World's Fair, (I especially loved a page where Sagan goes to the library to get a book about stars and is first given a book of Hollywood stars) to his adulthood fascination with planets and stars, including his work on the Voyager. Throughout the book, Sisson manages to convey Sagan's continual curiosity and wondering. Several vertical and foldout pages emphasize the immensity of the universe and add to the visual appeal. End pages include a note from the author, information on sources, and a bibliography.