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A global team of computer users has cracked one of the remaining World War II messages encoded by the Nazi Enigma machine. Noah Adams talks to Ira Flatow, host of NPR's Talk of the Nation Science Friday, about how the code was broken -- and a serious risk to users of the program used to crack the encryption.

The Bush administration unveils an updated version of its National Security Strategy, a document originally issued in 2002 to lay out the White House vision for the war on terrorism. The new version restates the doctrine of pre-emptive war and says Iran may pose an increased threat to the United States.

The U.S. is pushing countries around the world to accept new restrictions on their nuclear programs. An American diplomat at a conference in Geneva has proposed a treaty to ban the production of plutonium and highly enriched uranium. Security analyst Joe Cirincione talks with Steve Inskeep about the proposal.

Much speculation has been aired about Syria's role in the current Mideast crisis. Joshua Landis, a professor of history and Middle Eastern studies at the University of Oklahoma, tells Scott Simon that Syria wants to use Hezbollah to get back in the Mideast's diplomatic game.

In San Diego, former Rep. Randy "Duke" Cunningham (R-CA) is sentenced to 8 years, 4 months for taking nearly $2.5 million in bribes from defense contractors and others. He also is ordered to pay $1.8 million in restitution for charges of tax evasion.

Phone giant AT&T is buying BellSouth, another large phone company. The two are already partners in the Cingular Wireless cell phone company. If the $67-billion deal is approved by the government, it would reunite much of the old Bell phone network.

For every parent who warns that going out in chilly weather with no coat will make you sick, there's a kid who won't bundle up. A look at why kids hate coats, and whether there is a link between being cold and catching cold.

House Republicans vote Thursday on a replacement for former Majority Leader Tom DeLay. Rep. Roy Blunt (R-MO), the acting majority leader, is considered the frontrunner ahead of Rep. John Boehner (R-OH) and Rep. John Shadegg (R-AZ). Blunt and Boehner have strong ties to Washington lobbyists. Shadegg remains a "dark horse" candidate.

The residents of Pripyat were evacuated after the catastropic accident at Chernobyl. Officially, they are banned from living in the exclusion zone around the plant. But some residents snuck back into the ghost town and have resisted pressure to leave ever since.

Madeleine Brand speaks to New York Times correspondent Carlotta Gall, reporting from Afghanistan about the boost in the numbers of NATO troops and what impact it will have on fighting a resurgent Taliban.