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PBS introduced a nifty new channel this week serving streaming content to users with Roku boxes attached to their TVs. Is the shift to streaming inevitable?

The federal government's top climate scientists announced Tuesday that 2012 was really hot — among the top 10 hottest years on record and the hottest ever in the U.S., with rising sea levels, less Arctic sea ice and warmer oceans. And the American Geophysical Union called humanity "the major influence" on global climate change.

Fifteen top posts at the Department of Homeland Security, including retiring Secretary Janet Napolitano's position, are now vacant or soon will be. Many are being filled on a temporary basis, and lawmakers from both sides of the aisle want the Obama administration to get busy filling those jobs, too.

Music journalist Holly George-Warren's new book traces the troubled life and backwards career arc of Big Star's Alex Chilton. Reviewer Jason Heller says the book is a poignant and forthright portrait.

Spending on the Kentucky Senate race might reach $100 million. So what else could that get you in the Bluegrass State? NPR's Tamara Keith finds out when she calls up some local business owners.

In one semifinal, top-ranked Alabama is pitted against Ohio State. In the other, defending champion and undefeated Florida State takes on Oregon. Robert Siegel talks to Grantland's Holly Anderson.

Contrary to widespread belief, it's no harder to climb the economic ladder now than a generation ago. But the study did find that moving up that ladder is still a lot harder in the United States than in other developed countries.

President Obama has taken his time in choosing a new Federal Reserve Chairman. It's a four-year post so whoever he picks will lead the central bank well into the next president's term. Top contender Larry Summers withdrew his name from consideration. Analysts speculate the No. 2 at the Fed, Janet Yellen, will now be the top choice.

A survey of international travelers found that no U.S. airports rank near the top of the list. The best the U.S. could do was Cincinnati's ranking at No. 30. So what makes a good airport, anyway?

The top Republican and top Democrat on the Senate intelligence panel are floating a bill that would mandate cooperation in encryption cases, but critics say it creates a dangerous "back door."