INTRO: Cuba is in the middle of an unprecedented experiment in organic agriculture. When the Soviet Union collapsed ten years ago, so did Cuba's economy, and before long the island nation faced a severe food shortage. Without enough money to import food, or the fuel and fertilizer to grow it, the Cuban government made a bold move --- embracing alternative agricultural methods including organic farming and natural pest control. Minnesota Public Radio's Mary Stucky traveled to Cuba with a group of Minnesota agriculture experts. In the last of her series of reports, she takes a look at the lessons Cuba may have for other nations.