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Federal agents acted on hundreds of warrants Wednesday, in an operation that included at least 25 states.

In 1981, NBC presented a new police series that went on to make TV history. Hill Street Blues has just been released on DVD in its entirety for the first time.

DNA's instructions are written in a code of four molecular "letters," labeled A, C, T and G. For the first time, researchers have created and inserted two brand-new letters into a living cell.

The Department of Education has released its latest math and reading scores for 12th graders. The scores offer little good news for educators, with results low and largely unchanged since 2009.

The veterans affairs secretary says he takes seriously allegations that some patients at a Phoenix hospital may have died while waiting a year or more for treatment.

The U.S. is sending a team of experts to help find the nearly 300 abducted schoolgirls. But the three-week delay means that the girls are likely scattered, making the search that much tougher.

A campaign in Africa to prevent HIV has persuaded 6 million teens and men to get circumcised and aims to sign up 14 million more. To do so, health officials must appeal to male vanity.

President Obama visited Arkansas on Wednesday, where he surveyed the damage of last month's tornado and met with residents. It's a task he and many presidents before him have had to do far too often.

Rain forest residents had sued the oil giant, and Washington law firm Patton Boggs tried to make the company pay up. But Chevron sued the law firm for fraud — and is now due $15 million.

There's an assumption that women are more likely than men to collaborate. But as the number of women in Congress has increased, so has the partisanship and gridlock. Does a woman's touch help?