PRI's The World: 01/18/2016

Some sanctions lifted, others imposed, and a high-profile prisoner exchange — Yes, it was a busy weekend in Iran-US relations. Also, researchers in Greenland are unlocking the secrets behind the sudden melting of one of the island's biggest glaciers. Plus, we'll hear why the Israeli countryside is blanketed with wildflowers, when not too long ago those same flowers were under threat of extinction.