Open this photo in gallery: Students and other protesters in a tent camp on the campus of Columbia University, in New York, on April 24.Ted Shaffrey/The Associated Press The students at Columbia University who inspired pro-Palestinian demonstrations across the country dug in at their encampment for the 10th day Friday as administrators and police at campuses from California to Connecticut wrestled with how to address protests that have seen scuffles with police and hundreds of arrests. Officials at Columbia and some other schools have been negotiating with student protesters who have rebuffed police and doubled down. Other schools have quickly...