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The top two presidential candidates in Afghanistan shake hands and sign a power-sharing deal, ending months of bitter disputes over who will succeed Hamid Karzai.

The area of land no longer suitable for farming because of salt degradation is rising quickly. Scientists argue the private sector should help fund efforts to reverse it since it relies on the crops.

In the wake of violent clashes between protesters and police in Ferguson, Mo., President Obama is ordering a review of the federal programs that help local police departments purchase military gear.

Israel and Hamas have agreed on a cease-fire, which raises hopes of an end to the seven-week war in Gaza that has killed more than 2,000 people.

Thousands of pro-democracy activists continued to occupy Hong Kong's business district on Monday, as protests stretched into a third day.

The top contenders for the Nobel Prize in economics are said to be a pair of NYU professors who study entrepreneurship, and a Stanford researcher who did pioneering work into economic sociology.

Engineers have developed a low-cost material that efficiently sterilizes and desalinates water using only solar energy. The secret to the new technology is likely sitting right on your desk.

In Chile, a fire that started in the hills above Valparaiso continues to burn. The blaze has killed 15 people and destroyed 2,500 homes in the area that surrounds Valparaiso. Reporter Alexandra Hall looks at some of those affected.

Thanks to a big spring crop in Veracruz and police crackdowns on drug cartels, high prices for Mexican limes are falling earthward, just in time for summer cocktails. Mexican farmers are celebrating.

Serving chicken, pigeon or duck for the holiday may be harder this year for some families in China and Hong Kong. As the deadly H7N9 virus continues to spread, officials in China have closed many live poultry markets, while agricultural workers in Hong Kong plan to cull thousands of chickens this week.