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High school football players experienced brain changes long before they had symptoms of concussion. The findings suggest that concussions come from cumulative damage, researchers say.

Yulia Tymoshenko went from being Ukraine's prime minister to a prisoner, convicted of abuse of power last October. But her supporters say she is the victim of a political vendetta, and her daughter came to Washington, where she had access to top government officials as she fights for her mother's release.

The upcoming 30th anniversary of the Falklands war has heightened tensions between the two countries.

All kinds of companies were hiring last month. U.S. employers added 243,000 jobs in January, and the unemployment rate fell to 8.3 percent. Experts are cautiously optimistic, but the boost in hiring may give the president extra momentum going into November.

Saturday is Republican presidential caucus day in Nevada. Mitt Romney is counting on another win to keep him on the path to the nomination. Newt Gingrich and Ron Paul have also been campaigning in the state, while Rick Santorum is looking ahead to later contests.

President Obama wants Congress to end certain tax breaks for the very wealthy. In response, Senate Democrats introduced legislation that would require those earning $1 million annually to pay no less than 30 percent in taxes. The bill faces Republican opposition, and is likely to be an election year issue.

Miles Davis was honored with a postage stamp, but his childhood home has fallen into disrepair. Only a few homes of the talented and famous become tourist meccas like Graceland or Monticello. Architecture, beauty and politics all play a role.

Over the years, Stephen Thompson's Chicken Bowl has grown into a heated battle in its own right, with contests mirroring the thrilling heroics of the Super Bowl.

In Syria, the death toll is rising after what activists and opposition leaders are calling a massive offensive by pro-government troops in the city of Homs. Activists say at least 250 have been killed in what may be the single most violent day since Syria's anti-government uprising began in March.

Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.