With temperatures of 100 degrees below zero, conditions at the Antarctic are too treacherous for planes and boats. The only connection with the rest of world is a satellite hook-up. During the long winter of 1999, Dr. Nielsen, the only physician on staff of forty-one people, discovered a lump in her breast. Consulting via satellite e-mail with doctors in the U.S., she was forced to perform a biopsy and in June began to treat herself with chemotherapy....