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Presidents from Cuba to Iran took turns standing guard around Chávez's casket. Chávez will not be interred; instead he'll be on display in perpetuity.

The Arizona Democrat survived a gun attack and has gone on to campaign for changes in gun laws. "The fact that she went through this obviously horrendous tragedy and has recommitted herself to the political process ... is really inspiring," says Caroline Kennedy.

'Nightmare bacteria,' strains of superbugs resistant to even the most powerful antibiotics, have quadrupled in number in the last decade--and have been found lurking in hospitals in 42 states. NIH epidemiologist Tara Palmore and infectious disease specialist Brad Spellberg discuss how to find and contain these bugs, and a few ways we might outsmart them.

As J. Edgar Hoover became increasingly worried about communist threats against America, he instructed the bureau to conduct secret intelligence operations against anyone deemed "subversive." Enemies: A History of the FBI by Tim Weiner is now out in paperback.

From West Virginia comes news that the last portion of the Dick Henderson Memorial Bridge, which once connected the towns of Nitro and St. Albans, was demolished this morning.

Friday's surprisingly good jobs report and the lowest unemployment level in four years had many economists celebrating. The president and Republican congressional leaders, not so much. Ironically, the slice of good economic news could contradict the narrative each side is using to try to shape fiscal policy.

Why do people in Boston get the flu when it's cold, while people in Senegal get sick when it's hot? Humidity is a big part of the explanation. But how flu spreads in the tropics and more temperate climates appears to be different.

A Portland, Ore., resident was arrested Tuesday on charges of conspiracy to provide material support to terrorists. The FBI says Reaz Qadir Khan, 48, gave money and advice to a man involved in a deadly 2009 suicide bomb attack on the headquarters of Pakistan's intelligence service in Lahore.

Venezuela's president Hugo Chavez died Tuesday in Caracas, leaving many unanswered questions about the future of the country. Julia Sweig, director for Latin America studies at the Council on Foreign Relations, talks about the impact "Chavismo" had on Venezuela and the world.

Fidel Castro treated Hugo Chavez like a son, and the Venezuelan leader in turn provided large dollops of assistance to prop up the Cuban economy. Cubans are now worried that the oil shipments and subsidies could decrease or even end.