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Testimony in one of the most complex environmental lawsuits ever to reach trial is scheduled to begin at the end of the month. Shrimpers, waiters, housekeepers and others have joined in a federal lawsuit to determine who is responsible for the 2010 Gulf oil spill and how to compensate those affected.

Many hospitals around the nation are perilously close to running out of a form of the old standby cancer drug methotrexate. The reason: a principal supplier of injectable methotrexate shut down in November after it flunked an FDA inspection.

The latest threat to Mitt Romney's front-runner status in the Republican presidential field is Rick Santorum, who is tied with Romney in national polls. Ads from the Romney team define Santorum as a friend of K Street, but the former U.S. senator's conservative credentials may help him with Republican primary voters.

The number of people seeking jobless benefits dropped for the fourth time in five weeks and marked the fewest number of claims in four years.

What's the difference between primaries and caucuses, and why do states have different systems for choosing delegates? Political scientist Josh Putnam explains how delegates are picked, and how the process changed after the 1968 Democratic National Convention.

The monthlong lull in the Republican debate cycle may have come as a welcome break to some likely voters and political observers. The debates will be back soon enough. But turn away from them at your own risk — it's precisely at this point in the campaign season when they might be most decisive.

The United States and five other nations are embarking on a new program to limit pollutants connected to global warming. But they're not targeting carbon dioxide with this effort — instead, they're looking at methane gas, and soot.

The current controversy over insurance coverage of contraceptives is the latest chapter in the long and often bitter history of conflicts between the right to follow one's conscience and the demands of society.

A small group has gathered at the World Health Organization in Geneva to discuss a controversy over experiments that generated genetically altered viruses. After the meeting, which ends Friday, the WHO will announce what happened behind closed doors.

Lawmakers approved legislation to continue a payroll tax holiday and extend benefits for the long-term unemployed. The goal is to make sure enough people have enough spending money to keep the still-fragile economy growing. But some analysts say the economy doesn't need more help.