Nicholas Kristof and Sheryl WuDunn are on the show. Nicholas Kristof is a crusading journalist with viewpoints that are sometimes controversial. Along with his wife, journalist Sheryl WuDunn, he co-wrote a book, 'Half the Sky' that has become a rallying cry against the oppression of women and girls in the developing world. Nicholas and Sheryl hope to transform the book into a global movement. There's the book, a four-part TV documentary (featuring Hollywood stars like Olivia Wilde and America Ferrara), and now a Facebook game - all designed to bring attention to what they call 'the defining issue of our time': turning oppression into opportunity for women and girls.