Yale University
Yale New Haven Teachers Institute: The Aztecs: A Pre Columbian History
This site contains several lesson plans, a teacher bibliography, a student reading list, and a large amount of background information on the Aztecs.
Curated OER
Map of New Mexico
Use this site to learn the history of the controversial creation of the atomic bomb in the United States. Sound clips from National Public Radio and a photo gallery help to give you a first hand experience of the making of the atomic bomb.