It's dangerously cold in many parts of the country. If you have to venture out, follow these tips to keep you and your family safe.
The Centers for Disease Control and Prevention offers many useful tips on how to keep yourself and your family safe during periods of extreme cold.
Courtesy of NOAA/Institute for Exploration/University of Rhode Island
The last passenger pigeon dies, World War II begins, the Soviet Union shoots down a Korean airliner, and the wreck of the Titanic is discovered, all on this day.
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