Franciscan Sister Alicia Torres gathered about three dozen volunteers in the hall of Our Lady of the Angels Church in Chicago on Nov. 21, having them count off into groups to form teams to serve the roughly 600 guests who would be seated just an hour later. Sister Alicia, 30, spoke clearly and loudly enough to be heard without yelling. As she spoke, more volunteers were busy finishing the cooking for a Thanksgiving brunch that included baked frittata, roast pork, potatoes, fruit and pastries. Through it all, Sister Alicia maintained her good humor, greeting friends and volunteers with smiles...