All students need to know and understand the origins and evolution of their nation. They also need to understand the development of the nation's democratic institutions and ideals so that they are prepared to take part knowledgeably, as citizens and voters, in shaping America's future. The framework in U.S. history for the 1994-2018 National…

Modern biology has become increasingly molecular in nature, requiring students to understand basic chemical concepts. Studies show, however, that many students fail to grasp ideas about atom rearrangement and conservation during chemical reactions or the application of these ideas to biological systems. To help provide students with a better…