What I Know For Sure - Tenth Anniversary EditionBy: Oprah Winfrey In this updated edition of the bestseller published ten years ago, Oprah shares what she has come to know for sure in the last decade. After film critic Gene Siskel asked her, "What do you know for sure?" Oprah Winfrey began writing the "What I Know For Sure" column in O, The Oprah Magazine. Saying that the question offered her a way to take "stock of her life," Oprah has penned one column a month over the last twenty four years,