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North Korea confirmed on Tuesday that it had successfully conducted a third nuclear test. It's an important step toward North Korea's goal of building a bomb small enough to be fitted on a missile that could reach United States.

Of all the individuals in President Obama's first-term Cabinet, Energy Secretary Steven Chu was arguably the least likely to be found in official Washington. And now that the Nobel Prize-winning physicist is leaving government, there are a few reasons that understanding his legacy might take some time.

Many of the canines that have flocked to Manhattan are staying at the Hotel Pennsylvania. And there the pooches are treated like VIPs — very important pooches, that is. From spinach pizza to a doggie concierge, it's a pampered life for a show dog.

The former South Carolina governor hopes to make a comeback by winning a special election to his old House seat. He'll have to overcome a large field filled with current officeholders and quasi-celebrities such as Ted Turner's son and Stephen Colbert's sister

For Republicans along South Carolina's coastal low country, Tuesday is a chance to decide whether they want former governor and famously non-Appalachian Trail hiker Mark Sanford to represent them in Congress.

An obscure tax provision crafted for drug dealers is giving state-licensed medical marijuana dispensaries a headache. Federal income tax rates for dispensaries in Colorado can soar to 70 percent because businesses can't claim certain deductions. It's a policy the industry is trying to change.

In Germany, a new political party has cropped up with one sole aim: doing away with the euro. Unlike past anti-euro parties in Europe, this one is no fringe group. NPR's Soraya Sarhaddi Nelson reports they are banking on German frustration over bailouts of eurozone countries to propel them into office in national elections this fall.

In the ongoing debate about the possible benefits of vitamin D supplements, a study suggests that the vitamin might indeed play a role in mildly reducing high blood pressure. The study was small and looked at just African-Americans, but the authors say the findings warrant further research.

Host Scott Simon catches up on the week in sports with Howard Bryant of ESPN.

Financial terms of the sale, which is expected to close in the second quarter of 2013, were not disclosed. The announcement comes just weeks after major publishers launched their own book-recommendation website.