A Georgia public school teacher took the stand Thursday trying to reverse her firing after officials said she improperly read a book on gender fluidity to her fifth grade class. Katie Rinderle had been a teacher for 10 years when she got into trouble in March for reading the picture book “My Shadow Is Purple" at Due West Elementary School in suburban Atlanta’s Cobb County. The case has drawn wide attention as a test of what public school teachers can teach in class, how much a school system can