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Robert Siegel talks to Michael Leigh, senior adviser to German Marshall Fund in Brussels. They discuss how the European Union was formed to prevent another war in Europe. The Nobel committee in Oslo named the EU the winner of the 2012 Nobel Peace Prize.

Audie Cornish talks with David S. Cohen, Treasury Department Under Secretary for Terrorism and Financial Intelligence, for more about the gang MS-13's new designation as a transnational criminal organization.

NASA's space shuttle Endeavour is on its last journey. It's being towed through the streets of Los Angeles on its way to a science museum. Endeavour is expected to take two days to make the trip, providing gawkers with plenty of chances to get a glimpse.

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AUDIE CORNISH, HOST:

And now to one more rare thing that came from space: a meteorite. Some of the most unusual and prized meteorites fell to Earth from Mars. In a new journal article, scientists describe the latest one that was discovered, and this weekend, you can buy a piece of it. NPR's Christopher Joyce has this story of a journey from Mars to a Manhattan auction house.

CHRISTOPHER JOYCE, BYLINE: The meteorite is called Tissint, and it contains a unique story about Mars.

The figures are in for the federal government's fiscal 2012 and the deficit was $1.089 trillion, according to the Treasury Department and Office of Management and Budget.

That's less than the previous year's $1.297 trillion and is the third consecutive decline.

But it's also the fourth year in a row of a $1 trillion+ gap between spending and revenues.

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When the Soviet Union splintered two decades ago, one of the biggest U.S. worries was how to ensure that the vast Soviet arsenal of nuclear weapons was kept secure.

The American response was the Cooperative Threat Reduction program of 1992. The U.S. provided money and expertise to lock down and track weapons of mass destruction and make sure they stayed out of the hands of rogue regimes or terrorists.

The program has been hailed as a great success, with thousands of Soviet nuclear weapons dismantled over the years.

Reporting by the Charleston Gazette this week suggests that the Obama administration's efforts to impose tough new limits on miners' exposure to coal dust have stalled.

The United Mine Workers Union suggests election year politics may be the reason.