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Nathan Wolfe travels to the viral hot spots of the world, where viruses first jump from animals to humans. The scientist spends his days tracking emerging infectious diseases before they turn into global pandemics.

Vice President Joe Biden and Congressman Paul Ryan butted heads over everything from Middle East policy to abortion. Guest host Celeste Headlee talks style and substance with two former speechwriters: Paul Orzulak, who helped Biden prepare for last night's debate, and columnist Mary Kate Cary, who worked with the George H.W. Bush administration.

More jurisdictions are turning to gambling to plug budget holes, but some say the economic benefits are exaggerated.

Corning's Gorilla Glass isn't totally unbreakable, as anyone who's dropped a smartphone knows. But it's twice as durable as regular glass--at half the thickness. How do they do it? Dave Velasquez, director of marketing and commercial operations for Gorilla Glass, talks about the innovations that make this ultrastrong, ultralight glass possible.

The federal government lists marijuana as a Schedule I controlled substance--meaning it has no medically accepted use. Next week, interest group Americans for Safe Access will present the scientific case for marijuana's therapeutic effects to a federal appeals court, in hopes of relaxing federal restrictions. Oncologist Donald Abrams reviews the evidence on cannabis.

A sharecropper's son, he was appointed to the central bank's board in 1966 and served into 1974. Brimmer went on to serve the nation in other ways, including as chairman of the Washington, D.C., Control Board.

A meteorite from Mars hit the Moroccan desert in 2011. Now its otherworldly fragments are telling scientists about the history of the red planet. You, too, can own a piece of Martian history — if you've got a couple hundred thousand dollars to spare.

More than nine months after dropping out of the race for the Republican nomination for president, Rep. Michele Bachmann is back on the campaign trail. But this time it's in her Minnesota congressional district, where she faces an underfunded but tough Democratic opponent.

Fact checkers have raised some flags about some of the claims the candidates made regarding Medicare. Ryan tried to insist that his Medicare plan is bipartisan, while Biden at one point may have confused Medicare with Medicaid.

Just five months after his election, Francois Hollande is facing protests from people who voted for him. His popularity has plummeted and his once-lauded "steady approach" is now perceived as dithering.