DENVER, CO--AUGUST 23RD 2009-- Cesar Chavez Academy of Denver teachers, Stephenie Jarrett, left, and Pamela Kelly, right, exchange 4th grade students Tuesday morning after Kelly taught a writing exercise and Jarrett taught mathmatics. THE DENVER POST/ANDY [Getty Images]

DENVER, CO--AUGUST 23RD 2009-- Cesar Chavez Academy of Denver teachers, Stephenie Jarrett, left, and Pamela Kelly, right, exchange 4th grade students Tuesday morning after Kelly taught a writing exercise and Jarrett taught mathmatics. THE DENVER POST/ANDY CROSS (Photo By Andy Cross/The Denver Post via Getty Images)