An arctic air mass settled over New York City and much of the country Sunday evening, bringing a deep freeze that forced the cancellation of flights at airports across the city and New Jersey. At LaGuardia Airport,

More and more flights are being delayed Saturday at the Denver International Airport as an arctic blast moves in with snow and freezing temperatures.

Our writer spent 30 hours traveling with arctic wolves and gained a new appreciation for these predators of the tundra. Wolves pick at the remains of a muskox. To get this image, photographer ...

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