Question: Who co-wrote Half the Sky with American journalist Nicholas Kristof?

full_context: Document 1: Womankind Worldwide: Womankind Worldwide is an international women’s rights organisation working to support women and girls to improve their lives and communities in Africa, Asia and Latin America. It partners with women’s rights organisations on the ground, which are working to tackle the issues that affect women’s lives. In over 25 years, Womankind, together with its partners, has reached 20 million women, girls, men and boys across more than 70 countries.
Document 2: Nicholas Alipui: Nicholas Alipui is UNICEF's Director of Programmes. He chairs the Global Network for Sustained Elimination of Iodine Deficiency. In 2000, he was UNICEF's representative in Kenya and said that "the ongoing abduction and abuse of children in Kenya is one of the most serious violations of human rights." By 2004, he had become UNICEF's representative in the Philippines and called attention to the lack of official recognition of child pornography as a problem in the country. In this capacity, he also spoke out against the military use of children in the country and denounced infant formula, calling on the country's mothers to breastfeed. In 2008, as Director of Programmes, he met with President of Madagascar Marc Ravalomanana in order to strengthen the ties between Madagascar and the United Nations. In 2010, Alipui said that UNICEF and its partners in the Roll Back Malaria Partnership hoped to put an end to malarial deaths by 2015. In 2011, the European Food Safety Authority (EFSA) permitted infant formula company Mead Johnson to claim that the addition of docosahexaenoic acid to their infant formula contributes to the development of the visual system in infants, but Alipui opposed the EFSA's decision, saying that "there can be little doubt that the use of such health claims can mislead parents into thinking that the formulas are as good as, if not better than breast milk." He was interviewed in "Not My Life", an independent documentary film about human trafficking.
Document 3: Philip Kennicott: Philip Kennicott is the chief Art and Architecture Critic of "The Washington Post". Kennicott won the 2013 Pulitzer Prize for Criticism. He had twice been a Pulitzer Prize finalist before: in 2012, he was a runner-up for the criticism prize, and in 2000, he was also a finalist for the Pulitzer Prize for Editorial Writing for a series on gun control in the "St. Louis Post-Dispatch". In 2015, he was a National Magazine Award finalist in the Essays and Criticism category for an essay he contributed to "Virginia Quarterly Review"; that piece, "Smuggler,"
Document 4: Half the Sky movement: The Half the Sky Movement is inspired by Nicholas Kristof and Sheryl WuDunn's best-selling book . The movement seeks to put an end to the oppression of women and girls worldwide through a transmedia project that uses video, websites, games, blogs and other educational tools both to raise awareness of women's issues and also to provide concrete steps to fight these problems and empower women.
Document 5: Jonny Steinberg: Jonny Steinberg is a South African writer and scholar. He is the author of several books about everyday life in the wake of South Africa’s transition to democracy. Two of them, "Midlands" (2002), about the murder of a white South African farmer, and "The Number" (2004), a biography of a prison gangster, won South Africa’s premier non-fiction award, the "Sunday Times" Alan Paton Award. In 2013, he was among the inaugural winners of the Windham-Campbell Literature Prizes, awarded by Yale University. Steinberg’s books also include "Three-Letter Plague" ("Sizwe’s Test" in the United States), which chronicles a young man’s journey through South Africa’s AIDS pandemic. It was a "Washington Post" Book of the Year and was shortlisted for the Wellcome Trust Book Prize, among others. Steinberg is also the author of "Thin Blue" (2008), an exploration of the unwritten rules of engagement between South African civilians and police, and "Little Liberia: An African Odyssey in New York" (2011), about the Liberian civil war and its aftermath in an exile community in New York and described as an "extraordinary, stylistically varied mix of reportage, history and biography". Steinberg's 2015 book, "A Man of Good Hope", was described as "superb" by "Observer" reviewer Ian Birrell, who wrote: "On the surface, it is simply the biography of a lonely young migrant who dreams of a decent life, hardening his shell and hustling to survive in hostile human environments. Yet it is really an epic African saga that chronicles some fundamental modern issues such as crime, human trafficking, migration, poverty and xenophobia, while giving glimpses into the Somali clan system, repression in Ethiopia and lethal racism in townships."
Document 6: Not on Our Watch (organization): Not on Our Watch is a nongovernmental, international relief and humanitarian aid organization based in the United States. The organization was established by Don Cheadle, George Clooney, Matt Damon, Brad Pitt, David Pressman, and Jerry Weintraub in 2008, to bring global attention to human rights violations in Darfur and beyond, while providing resources to assist in putting an end to mass atrocities around the world. The organization has its roots in the book, Not On Our Watch, written by Don Cheadle and human rights activist John Prendergast, who is also a board member and serves as the organization's Strategic Advisor.
Document 7: Feminine Capital: Feminine Capital: Unlocking the Power of Women Entrepreneurs is a non-fiction book written by Barbara J. Orser and Catherine J. Elliott. The book provides insight into how the intersection between entrepreneurship and feminism is evolving. The authors situate women’s entrepreneurship within the broader contexts of economics and feminism, to consider how sex role stereotypes have led to entrepreneurial characteristics that are predominately masculine.
Document 8: Letter to Women: Letter to Women is a pastoral letter written by Pope John Paul II to "all" women, and deals most essentially with the rights and dignity of women, the many challenges that women in the modern era had to face, and ways in which the "cause" of woman could be forwarded in the world. Written and distributed on June 29, 1995, this letter was written in anticipation of the Fourth World Conference on Women in September 1995, hosted by the United Nations in Beijing. This letter was an affirmation to the continuing thought of Pope John Paul II on the importance of women in the Church, and the special roles in which only they can contribute in the realms of the family, the Church, and the world. In his pontificate which lasted longer than 26 years, he continuously upheld the dignity and honor of women, and this letter was a significant contribution to his corpus of works on the importance of women within the Church. Through this letter not only was the dignity and honor of women affirmed but of "all" people.
Document 9: Against Our Will: Against Our Will: Men, Women and Rape is a 1975 book about rape by Susan Brownmiller, in which the author argues that rape is "a conscious process of intimidation by which all men keep all women in a state of fear." Brownmiller's book is widely credited with changing public outlooks and attitudes about rape, but her arguments were rejected or criticized by sociobiologists, and others.
Document 10: Thunder from the East: Thunder from the East: Portrait of a Rising Asia (ISBN  ) is a 2000 book co-authored by husband and wife team Nicholas Kristof and Sheryl WuDunn. It is a nonfiction study of contemporary Asia.
Document 11: Half the Sky: Half the Sky: Turning Oppression into Opportunity for Women Worldwide is a nonfiction book by Nicholas Kristof and Sheryl WuDunn published by Knopf in September 2009. The book argues that the oppression of women worldwide is "the paramount moral challenge" of the present era, much as the fight against slavery was in the past. The title comes from the pithy statement of Mao Zedong 妇女能顶半边天 meaning “women hold up half the sky”.
Document 12: Nicholas Kristof: Nicholas Donabet Kristof (born April 27, 1959) is an American journalist. He is the winner of two Pulitzer Prizes. He is a regular CNN contributor, and has written an op-ed column for "The New York Times" since November 2001. According to "The Washington Post", Kristof "rewrote opinion journalism" with his emphasis on human rights abuses and social injustices, such as human trafficking and the Darfur conflict. Archbishop Desmond Tutu of South Africa has described Kristof as an "honorary African" for shining a spotlight on neglected conflicts.
Document 13: Kevin Flynn (journalist): Kevin Flynn, is an American journalist who is an editor with "The New York Times", and the co-author of "102 Minutes: The Untold Story of the Fight to Survive Inside the Twin Towers". His work as an investigative editor helped earn The New York Times numerous awards, including a 2009 Pulitzer Prize. He served as the newspaper’s police bureau chief from 1998 to 2002 when he became investigations editor for the newspaper's Metro desk. He is currently investigations editor for the paper's Culture desk.
Document 14: David Wood (journalist): David Bowne Wood is a journalist who has reported on war and conflict around the world for 35 years. He won the 2012 Pulitzer Prize for National Reporting, for a series on the American troops severely wounded in Iraq and Afghanistan. A birthright Quaker, Wood registered as a conscientious objector in 1963 and served two years of civilian service before becoming a journalist.
Document 15: Sisterhood Is Powerful: Sisterhood is Powerful: An Anthology of Writings From The Women's Liberation Movement is a 1970 anthology of radical feminist writings edited by Robin Morgan, a feminist poet and founding member of New York Radical Women. It was one of the first widely available anthologies of second-wave feminism. It was both a consciousness-raising analysis and a call-to-action. The collection addressed several major issues including "the need for radical feminism, the discrimination women experienced from men in the political left, and the blatant sexism faced in the workplace.” Kathie Sarachild had coined the phrase "Sisterhood is Powerful" in 1968, in a flier she wrote for the keynote speech she gave for New York Radical Women's first public action at the convocation of the Jeannette Rankin Brigade.
ground_truth: Sheryl WuDunn