The U.S. Supreme Court heard arguments Monday in a case that will decide whether public school districts can assign students to schools based on race. Hundreds of districts across the nation try to enforce diversity because they worry schools will become segregated if they don't. Education reformer Jonathan Kozol talked about the increasing segregation of America's schools in May at Carleton College. Jonathan Kozol, the former teacher who has written about race, poverty and education for nearly four decades, spoke about what he calls the "restoration of apartheid schooling in America"