Extreme cold in US north-east closes schools and Covid testing sites

Massachusetts, New York and Maine brace for subzero temperatures with wind chill factor, increasing risk of frostbite The US north-east girded itself on Tuesday for extreme cold that was expected to reach a wind chill value of -40F (-40C) in some northern areas and closed some schools elsewhere. Boston's public school system, the largest in Massachusetts, announced that schools would not open on Tuesday. The high in the city on Tuesday was expected to be 12F (-11C), with wind chills making it fe...