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President Obama wants Congress to extend the 2007 College Cost Reduction and Access Act, which would freeze interest rates on subsidized Stafford student loans for one year. Melissa Block speaks with Mark Kantrowitz, a student loan expert and publisher of FinAid.org for a primer on student loans and repayments.

On the eve of oral arguments in an important immigration case before the U.S. Supreme Court, the issue came to Capitol Hill. On Tuesday, Democratic Senator Charles Schumer convened a Senate hearing on the controversial Arizona law.

The Civil War remains the bloodiest conflict in U.S. history and the defining crisis of the nation. But it might easily have started 12 years earlier.

In 1850, California's application to join the Union threatened to unhinge the delicate balance of pro- and anti-slavery forces. The flood of European immigration had shifted power in the House of Representatives decisively to the North. Another free state would tilt the U.S. Senate.

It would be easy to confuse Dr. Mitch Katz with any other doctor at the Roybal Comprehensive Health Center in East Los Angeles. His desk in a closet-sized, windowless office is littered with patient records, X-rays and cans of Diet Coke.

His everyman demeanor belies his stature. As director of the county's Department of Health Services, Katz, 52, oversees Los Angeles' public hospitals and clinics, the health care of last resort for millions of low-income Angelenos. He oversees 22,000 employees and a $3.7 billion-dollar budget.

The U.S. Department of Agriculture says it has confirmed a case of Mad Cow disease in a cow in central California. It is the fourth case found in the country in recent years.

The animal was a dairy cow and "at no time presented a risk to the food supply or human health," U.S.D.A. Chief Veterinary Officer John Clifford said in a statement.

Joshua Bell, the violin prodigy who grew into what some call a classical-music rock star, has taken the helm of the Academy of St. Martin in the Fields. Bell is the orchestra's first music director since Sir Neville Marriner, who created the group.

On his first tour with the group as both music director and conductor, Bell plays the violin while conducting the orchestra simultaneously, gesturing with his bow. And he leads from the concert master's chair, rather than the podium, which seems unusual to some audiences.

Why did Missouri teen Maura Pozek make her prom dress out of cardboard and paper bags?

Because after fashioning the previous two years' outfits out of Doritos bags and soda can tabs, "I had to top myself somehow."

The Dutch scientist at the center of the controversy over recent bird flu experiments says that his team applied for government permission today to submit a paper describing their research to a science journal.

The Dutch government has asserted that the studies, which describe how to make bird flu virus more contagious, fall under regulations that control the export of weapons technology.

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