NoHorizon Is So Farfollows explorers Liv Arnesen and Ann Bancroft - the first two women to crossAntarctica - from the planning of their expedition through their brutal trek asthey walked, skied, and ice-sailed for almost three months in temperaturesreaching as low as -35F, all while towing their 250-pound supply sledgesacross 1,700 miles of ice full of dangerous crevasses.