He???ll put himself through real physical discomfort to get a fact.??? (Frazier???s next big book, Travels in Siberia, due out in a year or two, has involved not only several trips, including a six-week drive across the Siberian swamp and tundra, but also learning to speak and read Russian.) For Great Plains, Frazier returned to the site of Sitting Bull???s cabin in South Dakota to confirm that he