NPR News

Concussions affect the thinking of teenagers more than they do that of adults or children, according to a new study. But all three age groups show lasting problems with working memory after sports concussions.

As the phone hacking scandal that roiled his father's international news company deepened, James Murdoch is stepping down as Executive Chairman of News International.

The AP reports that News Corp., owned by James' father Rupert Murdoch, said he was stepping down "to focus on the company's international TV business."

We'll have more on this story as it develops.

Update at 9:28 p.m. ET. Murdoch's Statement:

During the last three months of the year, the U.S. economy picked up its pace of growth. The Commerce Department revised its previous estimate today and said the gross domestic product expanded at an annual rate of 3 percent, which exceeded the previous estimate of 2.8 percent and was better than the third quarter's 1.8 percent pace.

The AP reports:

"The growth estimate was revised up because consumers spent more than first thought, and businesses cut spending by much less.

Dino Laurenzi Jr., the man who collected a urine sample from the Milwaukee Brewer's left fielder Ryan Braun, is defending himself for the first time.

Laurenzi was thrust into baseball's drug testing debate, when Braun questioned his integrity during a press conference on Friday.

Federal prosecutors hope today's sentencing of former Massey Energy security chief Hughie Stover "will send a resounding message" as they pursue charges against higher-ranking executives.