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The dollar has helped make the U.S. the most economically powerful country for most of the last century, but other countries — including rivals like China — have the greenback on their sights.

NPR's Scott Detrow talks with Tom Grossi about his "If the NFL Was Scripted" series and the characters and storylines viewers should be watching for in the NFL playoffs.

Also in this week's tech headlines: Visa looks to boost online shopping, a Wall Street cyber scare, and fears that driverless cars could be used as "lethal weapons."

Matthew Miller, of Bakersfield, Calif., had entered North Korea on a tourist visa. The country says he sought to be thrown in jail to investigate human rights issues.

NPR interviews Maria Van Kherkove, the infectious disease epidemiologist who is a leader in the World Health Organization.

Also: Dozens of Kmart and Sears stories to close; al-Qaida in Iraq claims responsibility for last week's deadly bombings in Baghdad; "moving melee causes chaos" at Mall of America.

Also: Syrian official says regime won't use chemical weapons; rains in Beijing lead to 37 deaths; Bulgarian police widen their investigation into suicide bombing that killed Israelis.

A year after the attack on the Capitol, there's a growing realization that traditional tools to counter extremism in the U.S. may not apply.

Jeremy Greenberg was in charge of coordinating federal help after hurricanes, wildfires, earthquakes and other emergencies. He has resigned from leading FEMA's National Response Coordination Center.

Critic Alan Cheuse likes his books thoughtfully plotted — and 2011 has made him a happy reader. A tiger haunts, a teen flees, ballplayers dream and vampires reign in beautifully conceived stories from new and distinguished authors.