College campuses across the United States have been roiled by pro-Palestinian protests this month, with nearly all demonstrations calling for universities to divest from Israel in some form. So far, universities have refused to yield to those demands.What would divestment look like? Put most simply, divestment is the opposite of investment.Many universities have an endowment, which is donated funds generally invested in stocks, bonds and other financial instruments to help the university earn money.At Columbia, a group of students want the college to divest its $13.6 billion endowment…