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GUY RAZ, HOST:

The NFL is on the cusp of determining who will be playing in Super Bowl XLVI in Indianapolis. Tomorrow on the West Coast, the San Francisco 49ers face the New York Giants, and on the East Coast, the New England Patriots host the Baltimore Ravens. NPR's Mike Pesca is here to preview the matchups. Mike, hello.

MIKE PESCA, BYLINE: Hello.

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GUY RAZ, HOST:

It's WEEKENDS on ALL THINGS CONSIDERED from NPR News. I'm Guy Raz.

(SOUNDBITE OF MOVIE, "THE HOUSE I LIVE IN")

NANNY JENNER: Drugs is a monster. The killing, the stealing, those people being destroyed, it's devastating.

Let me take a second here.

Not very long, was it?

But a second tied up delegates to the UN's International Telecommunication Union, who postponed a decision this week on whether to abolish the extra second that's added to clocks every few years to compensate for the earth's natural doddering.

The earth slows down slightly as we spin through space. No one falls off, but earthquakes and tides routinely slow the earth by a fraction of a fraction of a second, which makes clocks minutely wrong. If not corrected, it could make a minute of difference a century.

The race for the 2012 Republican presidential campaign has been anything but predictable.

It's been the first contest in memory, for instance, with a candidate, Mitt Romney, who was reputedly the inevitable nominee but so suspect in many Republicans' eyes that they kept searching for an alternative. That has led to nearly every candidate in the crowded field, at one time or another, challenging for frontrunner status.

The final results for Egypt's parliamentary elections are in, and while there are no surprises, the Muslim Brotherhood exceeded expectations by capturing 47 percent of the vote.

The final election results were read out Saturday with little ceremony, but the final tally cemented what most people in Egypt already know: Islamist groups are the new political powerhouse in post-revolutionary Egypt.

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SCOTT SIMON, HOST:

Time now for your letters.

(SOUNDBITE OF TYPING AND MUSIC)

SIMON: Last week, we spoke with Clay Johnson, an open-source advocate and digital strategist, about his new book, "The Information Diet: A Case for Conscious Consumption."

CLAY JOHNSON: You know, our minds are really wired to be affirmed and to be told that we're right. And that's the central premise of "The Information Diet." It's really, who wants to hear the truth when they can hear that they're right?

Debris from the tsunami that hit Japan last March is just now starting to show up on the far northwestern shores of the U.S. Some fishermen are worried the floats and other rubble may tangle their nets and affect their livelihood. Ashley Ahearn of the public media collaboration EarthFix headed out to Washington State's Olympic Peninsula to see what's coming ashore.

Police have closed down dozens of toy shops for selling Barbie dolls in Iran, part of a decades-long crackdown against "manifestations of Western culture." Host Scott Simon looks at what's being called a "cultural Trojan horse."

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SCOTT SIMON, HOST:

This is WEEKEND EDITION from NPR News. I'm Scott Simon, and the polls are open in South Carolina; first southern state to hold a primary in the race for the Republican presidential nomination of 2012, the stakes are critical. The state has picked the eventual nominee in every year since 1980, and it's sure been a turbulent week with Rick Perry dropping out, Iowa declaring Rick Santorum the winner of its caucuses and Newt Gingrich closing in on Mitt Romney.