Gloria SteinemPhoto: Tom MarksWriter and activist Gloria Steinem has been involved in feminist and other social-justice movements for more than 40 years. She cofounded New York magazine, Ms. Magazine, the Ms. Foundation for Women, the National Women's Political Caucus, and Voters for Choice, and she's an advisor to the Planned Parenthood Action Fund and Equality Now, the international human rights/women's rights organization. She also serves on the program advisory board of Population Media Center. Q. What do you think are the biggest challenges the world faces today, and why? A. The biggest short-term challenge is violence. Our first normalizers of …