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>> its a part of the globe thats reached an extreme and that h tells about how the works and how clue matted works. we found the ultimate chilly morning you could possibly find. its pretty much the same kind of thing say a gardener would know about how cold could get on a clear night. in antarctica ita whole lot colder. martha: how do you measure it? >> we use satellites and sifted through quite a bit of data. one of the good parts about this was there is a new satellite we used that should be c...