We look into how genetically modified crops and high yields have affected our food supply in recent years. Then, retired opera singer Martina Arroyo looks back at her long distinguished career and discusses her foundation’s program for young singers. Also, a new novel about a woman who discovers a secret side of her father after his death. Plus, an update on the efforts to rebuild Haiti, six months after the devastating earthquake there. And, on Underreported, a look at what happened in the aftermath of an explosion at a BP refinery in Texas in 2005.