A snow plow operates during a storm in Hudson, New York, US, on Sunday, Jan. 7. Hundreds of flights have been grounded across the US from a pair of winter storms that left more than a foot of snow in New York's Hudson Valley and sparked blizzard warnings across the Great Plains.
Mandatory Credit: Angus Mordant/Bloomberg/Getty Images
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The number of blood donors in the US is at the lowest level in 20 years as hospitals struggle to meet the demand. To shore up the “critically” low supply, the Red Cross and the NFL said they will offer all blood donors this month a chance to win a trip to Super Bowl LVIII.

