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Microbes can thrive in extreme environments, from inside fiery volcanoes to down on the bottom of the ocean. Now scientists have found a surprising number of them living in storm clouds tens of thousands of feet above the Earth. And those airborne microbes could play a role in global climate.

As the nation ponders how to stop the next mass shooting, the gun rights movement offers one controversial answer: armed civilians. In 2005, one such private citizen tried to stop a mass shooting at a mall in Washington state — and paid a heavy price.

In the West African nation of Mali, residents of Timbuktu were cheering in the streets Monday, after the city was liberated by French and Malian forces after months under the harsh rule of Islamist fighters. In a final act of cultural warfare before fleeing Timbuktu, the rebels are reported to have set fire to libraries housing priceless manuscripts.

While Obama echoed the pillars of immigration reform presented by a bipartisan group of senators on Monday, he also made an emotional plea for reform.

Is eating raw meat worth risking diarrhea or worse? A recent Salmonella outbreak makes us wonder about the trend toward consuming beef that's undercooked or not cooked at all.

As expected, the Senate Foreign Relations Committee supports the nomination of Sen. John Kerry, D-Mass., to succeed Secretary Hillary Clinton. Meanwhile, Transportation Secretary Ray Lahood is the latest member of the administration to announce a departure.

If there's a settlement or judgment against another party in a liability case, Medicare is entitled to reimbursement for the money it spent on a beneficiary's medical care. The process is complex and prone to delays. A new law is expected to fix the problems.

President Obama will address the immigration issue in a speech Tuesday, following hard on the heels of a new overhaul proposal out of the Senate. Despite new momentum on the issue, those who favor a harder line against illegal immigrants are not convinced they need to change tack.

From tablets and iPhones to Twitter and Instagram, technology is changing the way children interact with the world. Host Michel Martin talks with a roundtable of parents about encouraging digital exploration, while keeping kids safe.

President Obama wants the nation to produce 8 million more college graduates by the year 2020. But can it be done, and how much would it cost? Host Michel Martin puts those questions to Anthony Carnevale, Director and Research Professor of the Georgetown University Center on Education and the Workforce.