Theme: Hi-Lo, emergent, teen content, full-color, Technology. Drones are a lot of fun to pilot, but what happens when a teenage boy uses his drone to invade his sister’s privacy? TERL Boosters offer expansion opportunities for your TeenEmergent Reader Libraries. Unlike the libraries, Booster titles are sold individually. Each Booster level supports a TERL library. Boosters can also stand alone and are excellent hi-lo classroom books. There are six Booster titles supporting each level of TERL. STEM Boosters offer a unique way to delve into science, technology, engineering, and math for emergent readers. Verse Boosters introduce readers to the versatility of contemporary poetry.