Cryogenics flight keeps it cool in the ice

U.S. Air Force Staff Sgt. Dustin Volpi, 354th Logistics Readiness Squadron fuels distribution supervisor, issues liquid nitrogen to a liquid nitrogen cart March 20, 2012, Eielson Air Force Base, Alaska. Liquid nitrogen can temporarily shrink mechanical components during machine assembly to perform press fits -- the process of fastening two parts by friction. (U.S. Air Force photo/Staff Sgt. Jim Araos)

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