(bright music) - Welcome to Room 9 Summertime, our nation's largest classroom. My name is Mrs. Turnage and I am a teacher in the Ritner School District in the St. Louis region. Today's lesson is a ...

Teaching in Room 9 is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, ...