Russian Grigory Perelman turned down math's most prestigious award today. He was to be honored for his breakthrough in solving the Poincare conjecture - a riddle regarding the nature of multidimensional space. Host Marco Werman speaks with "A Beautiful Mind" author Sylvia Nasar.

Israelis began trickling back to their homes in the north almost immediately after the war between Israel and Hezbollah. The tourists are coming back as well. Some did a little Katyusha tourism, stopping by the spots where rockets fell. The World's Aaron Schachter reports.

Ray Lemoine and Jeff Neumann were selling Red Sox T-shirts outside of Fenway Park...when destiny called. They decided, with admittedly little good reason, to go to Iraq to help distribute aid. They talk with anchor Marco Werman about their time in Iraq.

It's back-to-school time for millions of American children - including those of migrant workers. The World's Jason Margolis reports on the changing landscape of migrant education and challenges it poses to U.S. school systems.

Foreign ministers from the European Union meet this Friday in Brussels to decide how to boost the existing UN force in southern Lebanon. Host Marco Werman speaks with Dominique Moisi, an analyst at the French Institute for International Relations, about France's refusal to significantly increase the number of troops it's providing for the force.

Iran says it has submitted its formal response to the UN Security Council demand that it suspend its nuclear enrichment program. Anchor Marco Werman talks with former UN chief weapons inspector Hans Blix about Iran's nuclear intentions.

The Lebanese port city of Byblos is grappling with a massive oil spill, caused by Israel's bombing of a power plant. Correspondent Kate Seelye visited the city and reports on the damage and clean-up.

The World's Gerry Hadden brings us a new sound out of Barcelona. He profiles Muchachito and the Kickdrum from Hell.

Today's answer is Mount Stanserhorn in the Swiss Alps, where six competitors just completed a seven-mile course running backwards. Host Marco Werman speaks with Jurg Balsinger, one of the organizers of the first long-distance reverse-running race.