AdvertisementMedical Effects Of Extreme Cold: Why It Hurts And How To Stay Safe03:10Download AudioResumeJanuary 30, 2019Patti NeighmondfacebookEmailFrank Lettiere's eyebrows and eyelashes froze after his walk along Lake Michigan's Chicago shoreline Wednesday. Frostbite warnings were issued for parts of the U.S. Midwest as temperatures plunged. (Joshua Lott/AFP/Getty Images)