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.

A man the United States lists as one of its most wanted terrorists has been arrested in Cairo.

The AP reports that "security and airport officials" said Mohammed Ibrahim Makkawi was arrested when he arrived in the country on Wednesday from Pakistan.

Makkawi, who the FBI says is also known as Saif Al-Aldel, is wanted in connection to the 1998 bombings of U.S. embassies in Tanzania and Kenya. Makkawi, the FBI says, is also suspected of being a high-ranking member of al-Qaida.

Transcript

RENEE MONTAGNE, HOST:

At this year's fishing contest on Lake Winnebago in Wisconsin, they weren't just fishing for sturgeon. People arriving to fish parked their cars too closely, and the ice gave way. No one was hurt but three dozen vehicles were pulled out of the lake.

A line of severe storms moving across the Midwest left death and destruction in its wake early today.

The storms moved through Kansas and Missouri overnight, destroying one trailer park and leaving at least one dead in Buffalo, Mo.

The hardest hit area is Harrisburg, Ill., where authorities say at least six people have been killed after what is presumed to be a tornado raked the town before dawn. (Note: in situations such as this, details such as the number of people killed and injured change as more information comes in. We will be updating this post.)