What I Know for Sure

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 fourteen years, years in which she retired The Oprah Winfrey Show (the highest-rated program of its kind in history), launched her own television network, became America's only black billionaire, was awa…