Columbia protesters' demands have worked before. This time may be different.

A protester holds up a sign at a protest on Columbia's campus. Demonstrators are demanding the school divest from Israel.Alex Kent; Getty ImagesProtests have rocked Columbia University's campus.Demonstrators opposing the war in Gaza want the school to divest from Israel.In 1985, protesters had staged their divestment campaign — and it worked.The unrest at Columbia University isn't showing signs of slowing down.Student protests are escalating there and other college campuses over the Israel