"What does it take to move forty dogs, three sleds, twenty tons of food and gear, and six men from all over the world across nearly four thousand of the coldest miles on earth? Cathy de Moll, the executive director of the 1990 International Trans-Antarctica Expedition, introduces the wild cast of characters who made it happen, on the ice and off: leaders Will Steger and Jean-Louis Etienne, who first met accidentally, on the way to the North Pole;...