Betty Dukes (C), one of the six named plaintiffs, speaks to the media outside the U.S. Supreme Court in Washington D.C., capital of the United States, March 29, 2011. The U.S. Supreme Court on Tuesday questioned a massive sex discrimination lawsuit on behalf of at least 500,000 American women claiming that Wal-Mart favors men over women in pay and promotions. [Xinhua/Zhang Jun]