Why is Europe buried in snow?

Atmospheric patterns that normally keep Arctic cold over the poles abruptly changed in January, pushing frigid air over Europe, researchers say. Shrinking ice caps may be to blame. FULL STORY | 250 DEAD | PHOTOS | SHARE PHOTOS

VIOLENCE IN SYRIA

Gulf nations pull ambassadors

The move is part of a broad international effort aimed at sending a blunt message to Syria. Full story | Rift among rebels | Activist: Blood is like water  

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Live chat with CNN's John King

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