Today on The World: The US and Poland sign a deal to deploy the missile shield system that Russia objects to; A new report challenges the notion of racial harmony in Puerto Rico; and an Indian musician who's gone out on a limb to play the mandolin.

The U.S. and Poland signed an agreement today to locate part of Washington's missile defense system on Polish territory. Russia objects to it, and today said it would respond with more than diplomatic protests. The World's Jason Margolis has the story.

Video: Secretary Rice and Poland's Foreign Minister Sikorski sign the agreement

The World's Clark Boyd looks at the technology behind the United States' missile defense plans in Europe.

Lisa Mullins speaks with Monica Toft, associate professor of public policy at Harvard University, about the way U.S. missile defense plans are straining Washington's relationship with Russia.

Puerto Rico is proud of its reputation as a racially diverse island. But a new report challenges the notion of racial harmony in Puerto Rico. Phillip Martin has the latest of his reports on color around the globe.

Hua Guofeng

The World's Mary Kay Magistad reports that disabled people in China still face many barriers and discrimination. But they are drawing inspiration from disabled athletes competing in the Beijing Olympics. Also, about the death of Hua Guofeng, the man who succeeded Mao Zedong as chairman of China's communist party.

British athletes are doing well in Beijing. Writer Guy Browning says that's just not the British way.

Cyclist Chris Hoy won three gold medals for Britain

Our daily geography quiz.

The answer to today's Geo Quiz is Mount Isa a small mining town located in the northwest of Queensland, Australia. The mayor of Mount Isa sparked a controversy when he suggested a solution to the town's gender imbalance, as Lisa Mullins explains.

Kavitha Cardoza reports that foreign buyers are snapping up real estate in major US cities, like Washington DC.

Indian musician U. Shrinivas has given a new life to the mandolin. For decades the instrument was shunned in India, restricted to popular music like Bollywood movie soundtracks. But Shrinivas uses it to play classical Indian music. The World's April Peavey has the story.