Open this photo in gallery: University of Texas Police detain a man at a pro-Palestinian protest at the University of Texas, during the ongoing conflict between Israel and the Palestinian Islamist group Hamas, in Austin, Tex. on April 24.Jay Janner/USA Today Network/Reuters The student organizers of a pro-Palestinian encampment at Columbia University are vowing to stay until the school pulls its endowment money out of companies connected to Israel, thwarting the school’s efforts to end the protest even as similar camps spread to other campuses across the United States. By Wednesday, tent villages had sprung up at the Massachusetts Institute...