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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.

Thai police said the explosives used were similar to the ones used in the attack of an Israeli diplomat in India.

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.

Positioned above a tank full of stingrays at the National Aquarium, Weilerstein used her cello to serenade sea creatures (and many pleasantly surprised visitors) with music by Johann Sebastian Bach.

Slogans for Las Vegas restaurant the Heart Attack Grill include "Taste worth dying for." But the burger joint's shtick of serving "quadruple bypass" burgers collided with reality Saturday, when a patron suffered a heart attack while eating at the restaurant.

Dietary cleanses that promise immediate detoxification are all the rage this time of year. But experts say the body is naturally quite good at getting rid of most toxins and doesn't need a lot of help.