CARE USA has made the issue of child labor in the mines of Potosà a priority. Here, CARE's senior technical advisor on child labor, John Trew, talks with ABC's Jeffrey Kofman while a little girl from the CARE Center for children and mothers plays with our equipment. Trew has traveled the world studying child labor and says the conditions in the mine here are "among the worst" he has seen anywhere. (Jean Friedman/ABC News)