This interactive periodic table shows the relationships among the elements and illustrates the electron configurations responsible for each element's chemical properties. In the "Mystery Elements" section, students identify and place unknown elements in their correct location on the table, based on their physical and reactive characteristics.

This brief video excerpt, from Evolution: "Why Sex?", biologist Robert Vrijenhoek discusses the Red Queen hypothesis through the example of the Mexican Poeciliid fish. Vrijenhoek has been studying the Mexican Poeciliid fish for more than 30 years. Some species of Poeciliopsis reproduce sexually while others reproduce asexually. Vrijenhoek found that the genetic diversity produced by sexual reproduction allowed the sexual fish to survive a parasite more successfully than the asexual fish. Invoking the Red Queen hypothesis, Vrijenhoek suggests the sexual populations are able to keep up or adapt to new selective challenges, while the asexual populations, essentially clonal, are not. Supplemental resources, including a background essay and discussion questions, are also provided.

This resource challenges students interested in engineering to investigate skyscraper emergencies and figure out how to fix them. They can stop by the Skyscraper Basics page for assistance, a link is provided.

In this video,students investigate how the Massachusetts Water Resources Authority has determined that their water treatment facility has had a positive impact on Boston Harbor. This video focuses on how mean, standard deviation, and confidence intervals are used to demonstrate measureable improvements in the water quality, taking math out of the classroom and into real world problem solving.

This resource introduces students to ten people who build big (sports arenas, museums, bridges). Students will learn about the challenges and educational requirements of civil engineers, electrical engineers, and others. Links provide illustrations and statistics of some of these huge building projects.