The infamous polar vortex has put the U.S. and Canada in a deep freeze several times already this winter. Alarmed weather forecasters are now routinely displaying big maps that show the extremely low wind chill values: –34 degrees Fahrenheit in Minneapolis, –36 degrees F in Chicago, –39 degrees F in Fargo, N.D., last night alone. But if the air temperature is, say, 15 degrees F, and a 20–mile per hour wind makes the wind chill –2 degrees F, would the temperature of your exposed skin drop to that temperature?
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