SEATTLE - Scientists at the University of Washington are optimistic that they've made what they call meaningful progress toward learning how to repair damaged human livers with stem cells. If the experimental work continues successfully in the years to come, the technique could one day repair livers badly damaged by drug overdoses, hepatitis and alcoholism. The UW research was reported in this week's edition of the Proceedings of the National Academy of Sciences. "I think it's a significant first step," Dr. Nelson Fausto, chairman of the university's Department of Pathology, told The Seattle Times. For the first time, a team...