For years, young adult literature, better known as YA, has had a faithful following of younger readers. But now, more people over the age of 18 than ever before are picking up these addictive books, turning the genre into a booming business. On Saturday, NewsHour Weekend Correspondent Tracy Wholf sits down with award-winning author Lois Lowry and more to discuss how these titles are being adapted into popular films. That, and the weekend's news, online and on-air.