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After decades of war, the South Sudan became its own country and despite continued fighting, there are signs of hope.

After winning the 1992 America's Cup race, Bill Koch — the brother of billionaire industrialists David and Charles — treated all 260-plus people on the team, plus their families, to a trip to Hawaii. Now, the lesser known Koch brother has entered the presidential derby big leagues with a $2 million donation to the superPAC supporting Mitt Romney.

A federal task force's recommendations against routine blood tests for prostate cancer raises big questions about how to interpret medical evidence and what role expert panels should play in how doctors practice. But those questions aren't easy to answer.

The unemployment rate is 8.1 percent, but the underemployment rate — that's people who work part time but want full-time work — is much higher. For many people, making ends meet means cobbling together temporary jobs. And, of course, there are some apps for that.

With desertification, drought and a booming mining industry, Mongolians are leaving the traditional life of herding. Herdsman Bat-Erdene Badam says he will be the last in his family to tend livestock. His children are trading in their nomadic lives for more stable, often urban jobs.

Researchers say that changing what 4-year-olds see and think about when a book is being read can improve kids' reading skills later on. The key: Focus their attention on the words instead of the pictures.

A new cyber-spying program called Flame has been spreading across the Middle East. A Russian security company called Kaspersky Labs discovered the virus. Some experts believe Flame was developed by the makers of the virus Stuxnet.

Israeli demonstrators turned violent last week when calling for the deportation of African immigrants. Host Michel Martin speaks with Ilan Lior, a reporter with Israel's Haaretz newspaper. They discuss the Tel Aviv protest and why tensions are boiling over between some Israelis and African immigrants.

Old people do have a unique smell. Researchers found that volunteers could reliably distinguish the body odor of the elderly from a whiff of the young or middle-aged. And, it turned out, the aroma from younger men smelled the worst.

Sergei Magnitsky was a tax lawyer for an investment fund in Russia that was seized by tax police who extracted more than $230 million in illegal refunds for themselves. Magnitsky decided to investigate, was arrested and later died in prison. Now, the government is bringing him to trial "to protect themselves," human rights groups say.