Morning Edition for May 30, 2011 Hear the Morning Edition program for May 30, 2011

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Soldiers walk past part of a message written in blood at the site of a massacre at a ranch in northern Guatemala on May 16. The message is a warning to Otto Salguero — the owner of the ranch, according to local media. Guatemalan authorities blame the killings on the Mexican drug cartel Los Zetas. Moises Castillo/AP hide caption

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Moises Castillo/AP

Mexican Cartels Spread Violence To Central America

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President Obama, with Facebook CEO Mark Zuckerberg, speaks during a town hall meeting April 20 at Facebook headquarters in Palo Alto, Calif. Mandel Ngan/AFP/Getty Images hide caption

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Mandel Ngan/AFP/Getty Images

Facebook Has Powerful Friends; Will Users Suffer?

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A study published in the journal Science last December suggested that a bacterium found in California's Mono Lake was able to substitute arsenic for phosphorous. But that conclusion has many critics. Miss Bliss 55 via Flickr hide caption

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Miss Bliss 55 via Flickr

Study Of Arsenic-Eating Microbe Finds Doubters

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Protesters demand that Syrian President Bashar al-Assad step down, in front of Arab League headquarters in Cairo. Amr Nabil/AP hide caption

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Amr Nabil/AP

Change Appears Inevitable In Syria, Analysts Say

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