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A recent shelling and current military exercises have made the Korean peninsula more on edge than it has been in decades. Despite bellicose rhetoric, an outbreak of war seems unlikely -- in the short term. But North Korea presents a threat that may worsen in coming years.

Intelligence officials have long hoped that data mining — collecting vast amounts of personal information — would uncover some sort of discernable terrorist pattern. But as hopes for that outcome dim, analysts are turning to a system that searches through data to find common threads.

What can San Diegans do to help the victims of the massive earthquake and tsunami in Japan? And, what challenges has the local Japanese community faced as it tries to contact family and friends back home? We speak to the president of UC San Diego's Japanese Student Association, the director of disaster services for the local Red Cross, and KPBS Science and Technology Reporter Peggy Pico.

No country in the world is more dependent on its computers than the U.S., making it uniquely vulnerable to attack. One official tells NPR that the Pentagon has experienced an "explosion" of computer attacks, currently averaging about 5,000 each day. But is the country ready to wage a cyberwar?

For more on the diplomatic fallout from the leaked State Department cables, NPR's Guy Raz talks to Christopher Hill, the former U.S. ambassador to Iraq, and former chief U.S. negotiator with North Korea.

South Korean President Lee Myung-bak took responsibility for failing to protect his country against attack and threatened retaliation against any further provocation by North Korea.

North Korea warned Friday that U.S.-South Korean plans for military maneuvers put the peninsula on the brink of war.

The Middle East is facing its worst water crisis in decades. For three summers, the annual rains have failed to come. Farmland has dried up in Iraq, Syria, southeast Turkey and Lebanon. The dire conditions are creating a new phenomenon: water refugees.

President Obama pledged the U.S. would defend South Korea after the North shot dozens of rounds of artillery onto Yeonpyeong island, near their disputed western border. Two South Korean marines were killed. The South Korean army fired back, deploying fighter jets to the area.

President Obama pledged Tuesday that the United States would defend South Korea after what the White House branded an outrageous attack by North Korea on its neighbor.