(CBS) Census figures reveal a new reality in America's classrooms, reports CBS News correspondent Nancy Cordes. Minority populations are climbing everywhere. "The white population, I wouldn't say is fading into the background, but it is becoming the older, less fertile part of the population," says demographer William Frey of the Brookings Institute. Frey crunched the census data and found huge jumps in the Hispanic population far from the traditional melting pots - up 21 percent in St. Joseph, Missouri; up 17 percent in Scranton, Pennsylvania; and 15 percent in Pascagoula, Mississippi - all in just one year's time. "You're seeing...