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Robots from around the world are competing in a Pentagon-sponsored robot "Olympics" this weekend. The challenge is to build a robot that can do human tasks and even go into disaster zones.

In the biggest city in Latin America, the pickings are pretty slim for local, organic food: The city has just 20 organic farmers' markets. But many Brazilian farmers rely heavily on pesticides, and health-conscious consumers are starting to seek alternatives.

Malaria remains one of the deadliest diseases worldwide. But the U.S. successfully wiped out the mosquito-borne parasite from the American South in the early part of the 20th century. One researcher thinks this successful campaign offers lessons for how to stop malaria worldwide.

Boston Marathon bombing suspect Tamerlan Tsarnaev "vaguely discussed" jihad during a 2011 phone conversation with his mother, a U.S. official tells the Associated Press. The call, taped by the Russian government, reportedly did not include any mention of a plot in the U.S.

The Department of Justice has reached an agreement with the University of Montana to resolve an investigation into the school's response to accusations of sexual harassment since 2009. The federal inquiry will continue to examine how Missoula city officials have handled such cases.

British naturalist Alfred Russel Wallace warned well over a century ago about the risks to diverse forms of life in places like Indonesia. His words are more compelling today than when he wrote them.

A NASA mission to the moon has completed the first high-bandwidth space-to-ground communication using a laser. This is a big upgrade from the radio systems now in use and could potentially revolutionize deep-space communication.

The process of cataloging and destroying Syria's chemical weapons stockpile is continuing, as the country met Sunday's deadline for submitting a formal declaration. Weapons experts must also complete their inspection of all 23 storage and production sites today.

Gas prices are down sharply. Grocery costs haven't budged lately. Meanwhile, the housing recovery is slowing. Amid evidence of continued sluggishness in the economy, the Federal Reserve says it's not ready yet to end its easy-money policy.

Despite the president's Syria speech, the path to congressional authorization of military strikes in Syria is no easier than before. The timing of when, or even if, Congress will hold votes is now an open question.