May 20, 2013, began as a normal day at Plaza Towers Elementary School in Moore, Oklahoma. Just before 3:00 p.m., a loud siren went off--a tornado was coming Students and teachers raced to find shelter from the massive twister. The storm violently shook the school. Its powerful, swirling winds tore the roof off the building and caused some of the school's walls to collapse. Would the students and teachers inside survive the storm's fury? Oklahoma's...