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Every answer is the name of a world capital. You'll be given a four-letter word. The first two letters are the first two letters of the city's name, and the last two are the last two letters of the country's name. For example, if you were given "loin," the answer would be London, Great Britain.

Cement plants, like Ash Grove in Chanute, Kan., burn hazardous waste for fuel, causing anxiety for nearby residents despite assurances of regulators.

Cement plants, like Ash Grove in Chanute, Kan., burn hazardous waste for fuel, causing anxiety for nearby residents despite assurances of regulators.

Huntsville is the shining star in Alabama's economy. Scientists there designed the rockets that put man on the moon. In the past 50 years, it's become a magnet for high-tech space and defense jobs. But with NASA downsizing and the specter of defense cuts looming, Huntsville finds itself in limbo.

Huntsville is the shining star in Alabama's economy. Scientists there designed the rockets that put man on the moon. In the past 50 years, it's become a magnet for high-tech space and defense jobs. But with NASA downsizing and the specter of defense cuts looming, Huntsville finds itself in limbo.

Revenge attacks are alarming those hoping for a swift transition to peace in Libya. Some villages where loyalists to overthrown dictator Moammar Gadhafi used to live are now abandoned, and locals hope they stay away. As well, militias still have their weapons, and regional rivalries are at play.

Revenge attacks are alarming those hoping for a swift transition to peace in Libya. Some villages where loyalists to overthrown dictator Moammar Gadhafi used to live are now abandoned, and locals hope they stay away. As well, militias still have their weapons, and regional rivalries are at play.

The system Congress set up to clean up poisonous air pollution still leaves many communities exposed to risky concentrations of benzene, formaldehyde, mercury and many other hazardous chemicals.

As the world's population tops 7 billion people, population experts are worried about inevitable increases in cars, computers, bigger homes and a drain on resources. In an effort to combat this, one California company is producing small, energy-efficient homes — some as tiny as 300 square feet.

As the world's population tops 7 billion people, population experts are worried about inevitable increases in cars, computers, bigger homes and a drain on resources. In an effort to combat this, one California company is producing small, energy-efficient homes — some as tiny as 300 square feet.