Boomerangs! Catapults! Sword rockets! Bat bombs! Throughout history, people have had no trouble finding ways to harm one another. Discover some of the strangest and most dangerous weapons that people have ever made.

Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage. These 96 leveled (A1-B2+), highly engaging titles feature Discovery Education™ videos that are fully integrated into the pedagogy of the readers. Choose from four formats: book plus access code for online content; online only; iOS app; and Android app. The online version of these readers comes complete with a learning management system - class creation, progress t