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Pope Francis kicks off a three-nation South America tour with a mass in Ecuador on Monday. Aiding the poor is at the center of his mission, which will include stops in Bolivia and Paraguay. It is his second South American trip since becoming pope.

The NAACP Legal Defense Fund has said it will push for a civil rights case against George Zimmerman, who was acquitted in the fatal shooting of black teen Trayvon Martin.

The high-tech giant was accused of colluding with publishers. On Wednesday, a judge agreed that Apple had acted improperly. The company argues that it engaged in hard-fought negotiations with the other companies and says it will appeal the ruling.

Diplomats from 24 nations and the European Union are meeting in Germany next week to discuss creating a nature preserve that could be larger than three times the size of Texas. Stretches of water around Antarctica are relatively pristine and home to thriving ecosystems.

After the Civil War, pursuing butterflies was more than a pastime for many Americans — it was a passion. In his book, Butterfly People, William Leach chronicles the infatuation, from its European roots and natural-history tradition to its eventual fall.

Renee Montagne talks to former Energy Secretary Stephen Chu, who stepped down in April, about the current energy boom and how he would like to change energy policy.

In the coming weeks, the Obama administration will ply host to the leaders of several Middle Eastern nations. They are coming, in part, to register their concerns about the ongoing violence in Syria and to nudge the Obama administration to do more to tip the balance in favor of the rebels trying to oust Syrian President Bashar Assad.

Somalia now has the dubious distinction of having the worst polio outbreak in the world. The country had been polio-free since 2007. If this outbreak gains a foothold, health workers fear it could spread into the Middle East.

The country's spectacular antiquities are being plundered by rebels, organized criminal groups and desperate civilians. Many items go across the border to Lebanon.

On Thursday, a psychiatric patient opened fire at Mercy Fitzgerald Hospital outside Philadelphia, killing a caseworker and injuring his psychiatrist.