Refugees and migrants continue streaming into Europe, many of them on boats crossing the Mediterranean. Some of those migrants are landing on the Greek islands, finding themselves suddenly thrust into the epicenter of Europe's financial crisis. While all eyes are on Greece, is it China that we should really be worried about? We'll head to Shanghai to hear about the sinking of the Chinese stock market, and what it means for the global economy. Plus, talks to secure a nuclear deal with Iran continue in Vienna. A reporter for The Boston Globe is in Vienna, and he writes, "The US negotiating team here over the past five weeks has gone through 10 pounds of Twizzlers (strawberry flavored), 20 pounds of string cheese, 30 pounds of mixed nuts and dried fruit, and more than 200 Rice Krispies Treats."