The document summarizes various aspects of Aztec civilization including their religious practices, writing system, medicine, arts, and eventual collapse at the hands of the Spanish conquistador Cortes. Key details are that the Aztecs practiced human sacrifice of up to 20,000 people at temples, they wrote with glyphs only priests could read, they used many effective herbal medicines, and their empire was conquered by Cortes through siege and execution of their emperor in 1521.