You wouldn’t know it from the rancorous national debate, but the flow of illegal immigrants from Mexico to the U.S. has slowed to a halt. We talk to Douglas Massey, co-director of Princeton University’s Mexican Migration Project, who says the reasons have as much to do with improved education and economic prospects in Mexico as they do with beefed up border security. Also, a new exhibit at the Cambodian Association of Illinois uses images, artifacts and personal stories to shed light on the genocide. We hear from two survivors in the Chicago area who are concerned that people still don’t know about the genocide that killed two million people. And on Global Notes, we look into another consequence of the Khmer Rouge: the death of 90 percent of Cambodia’s artists. We meet Evanston native Dan Schwarzlose, who’s dedicated his life to preserving Cambodia’s rich musical heritage.