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North and South Korea are still officially at war, even though a truce was declared more than 50 years ago. As a result, there are upwards of 22,000 North Korean defectors now living in South Korea. The journey across the heavily guarded border is treacherous and often deadly. It's been just over a month since Kim Jong Un rose to power after his father Kim Jong Il's sudden death and there are some reports of would-be defectors being shot down while trying to flee the impoverished nation.

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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.

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GUY RAZ, HOST:

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

JAY CARNEY: We need to do something about online piracy by foreign websites.

UNIDENTIFIED GROUP: Stop SOPA. Pass on PIPA.

REPRESENTATIVE JOHN BOEHNER: It's pretty clear to many of us that there's a lack of consensus at this point.

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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.

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.