For today's Geo Quiz we were looking for the Russian port city that's dealing with an environmental disaster this week. The answer is Kavkaz. Rescue and clean-up operations are underway as a damaged Russian oil tanker leaks a half million gallons of oil into Russia's Black Sea. Anchor Marco Werman gets more on the story from Dario Thuburn.

Our daily geography puzzler.

Venezuelan President Hugo Chavez stunned leaders from Spain, Portugal, and Latin America at a meeting last weekend when he insulted the former prime minister of Spain. Anchor Marco Werman has details.

Protests are erupting throughout Venezuela as a planned vote on constitutional reforms draws near. The reforms would expand President Hugo Chavez's power...and - critics say -- severely weaken one of South America's oldest democracies. Reporter Ruxandra Guidi has more from Venezuela's capital, Caracas.

The World's Patrick Cox continues our week-long series on global obesity with a report on how Finland tackled the problem -- it simply cut the fat out of the nation's food supply. Some experts think Finland's experience could offer a valuable lesson for other countries battling an obesity problem.

A group of former pilots and government officials is calling for the US government to re-open its investigation of UFO sightings. Anchor Marco Werman finds out more from Nick Pope, former UFO investigator for the British Ministry of Defence.

Internet giant Yahoo settled a lawsuit filed in the US on behalf of two journalists who were arrested by authorities in China. The lawsuit alleged Yahoo was at least partly responsible. Technology Correspondent Clark Boyd has the story.

Could a loose nuke from -- say -- Pakistan wind up as a suitcase bomb? Anchor Marco Werman explains why that's not very likely.

The World's Jeb Sharp reports that the drama unfolding in Pakistan is getting a muted reaction from the country's neighbors.

The World's Matthew Bell reports on Bhutto's role as self-appointed leader of the opposition in Pakistan. Many Pakistanis are skeptical of Bhutto because she engaged in power-sharing talks with General Pervez Musharraf prior to the imposition of emergency rule.