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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?

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.

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.

Tieyan Liu of Microsoft Research Asia in Beijing says that as a researcher, he isn't focused on the competition, but rather on his own projects — and on how best to collaborate with his colleagues in the U.S. He reflects on what his facility has meant for Chinese-educated researchers and for the country's universities.

Institutional Wellbeing, on view through August 9th at Oceanside Museum of Art.

Conceptual artist Brian Goeltzenleuchter creates a special scent for Oceanside Museum of Art.

Can You Pass The Test?

AIDS is the number one killer in sub-Saharan Africa, and it's the fourth leading cause of death worldwide. Researchers have been trying to develop a vaccine to protect people against HIV, the virus that causes AIDS. So far, the results have been disappointing. From the International Aids Conference in Capetown, South Africa, KPBS Health Reporter Kenny Goldberg tells us the search continues.

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.