A Possible Shutdown; The Siberian Express; Sahadi's and 'The Italian Americans'

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A man covers his face from the February chill in Greenwich Village.

If Congress can't figure out a way to fund the Department of Homeland Security by Friday, it might (partially) shut down. NPR's Ailsa Chang explains what this would mean for national security. Plus: the filmmaker and author behind the PBS series "The Italian Americans;" NPR science correspondent Shankar Vedantam; what the "Siberian Express" has to do with the current cold snap; and Bob Sahadi of Sahadi's Middle-Eastern grocery talks about keeping the family business going over generations.