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This super cold air is usually whirling around the Arctic. But a big piece has plunged further south than normal. One way to think about what's happening: If a spinning ice skater extends her arms, she slows down. Sometimes, she wobbles and falls. The polar vortex has sort of stretched out an arm.

Although it may be uncomfortable for patients to learn that there are profound disagreements among doctors about medicine, these differences of opinion are common.

The motivation for flying with other birds in V formation is probably to save energy, say researchers who tracked the pattern of wing flaps in an ibis flock. Each bird in the V catches a bit of lift from the bird ahead.

Ousted Egyptian President Mohammed Morsi was in a Cairo courtroom on Tuesday, seen and heard for only the second time since he was thrust from office in a military coup last July. Morsi and other members of the Muslim Brotherhood are facing charges of collusion with Hamas and Hezbollah during the 2011 uprising against the Mubarak regime.

Of all the things Americans traditionally associate with Thanksgiving — turkey, family, football — politics doesn't rate high on the list. But on occasion the national holiday has intersected with the political world and generated some stories to remember.

High hopes dashed, Oregon is the first state to abandon having its own health insurance marketplace. Now it has to figure out how to transition to HealthCare.gov.

EU foreign policy chief Catherine Ashton is in Washington Tuesday for a meeting with Secretary of State John Kerry that is likely to be dominated by events in Ukraine.

Correspondent Peter Kenyon tells NPR's Rachel Martin that voting is brisk in Sunday's presidential election in Ukraine — except in the east, where pro-Russian separatists have shut down polls.

Philadelphia's largest daily newspapers have been sold for $88 million. The Philadelphia Inquirer and Daily News are changing owners after months of conflict between the papers' previous co-owners.

Pro-Russian separatists in Eastern Ukraine have rejected a cease-fire plan offered by Ukrainian President Petro Poroshenko.