David Oyelowo, center, as Dr. Martin Luther King Jr. and Carmen Ejogo as Coretta Scott King in Selma.(Photo: Atsushi Nishijima Paramount Pictures)We cannot leave 2015 as we have entered it. But to become changed, we must focus on what we keep doing over and over and stop doing it.We must focus on those things in the circle of history that remain unchanged in any monumental way as we pass from century to century, from...