The Smithsonian's EdGate project provides this illustrated narrative site that explores the mapping of the American West accomplished by the 1804-06 Lewis and Clark expedition.

This index of links offers the opportunity to explore important and interesting topics. Visiting links on the desired topic is most likely to provide primary sources or at least point students in the right direction.

University of California site showcases how different types of organisms exist on the Earth and the history of life.

This is a very good introduction to the role evolution plays in the development of biodiversity. These topics and extinction are explained with the use of colorful interactive pictures.

This site provides a lengthy overview of the life and work of Thomas Hobbes (1588-1679 CE). Content includes a focus on Hobbes' "Leviathan" and the personal controversy that followed.

This tutorial explains light absorption, reflection and transmission in a clear and concise manner. Provides a "Check Your Understanding" section as well as additional links on color and light.

This site discusses primary lighting sources and gives information on the different properties and spectral characteristics of each. Also includes links to some interactive Java applets.

Excellent information on the textile mills of the 1920s and 30s. Problems such as production and demand, strikes, and the General Strike of 1934 are discussed. Included are first person accounts.

A veteran social studies teacher shares lesson plans and ideas to teach units on Ancient Mesopotamia. There are even activities to learn about Hammurabi's code and making Sumerian cylinder seals.

This personal site provides a list of links and lesson plans related to immigration up to the current time.

This interactive linear system solver allows you to enter two linear equations in general form and then plot the lines and find the answer using either substitution or elimination. The answer is presented with both methods accompanied by a graph.

Students learn to locate the real number solution of a linear equation using tables. They also learn to locate the real number solution of a linear equation using graphical method on a Cartesian (x-y) graph.

Students learn to associate the slope of a straight line with a constant rate of change. They also learn to calculate the rate of change from data points on a line, using the correct units. Students also learn to read from a linear graph: the rate of change, the scale of the axes, and the correct units.

In these questions, students will find the linear equation of best fit for a set of data and interpret the correlation coefficient. Questions are multiple-choice and true/false; solutions are provided.

This video segment from "Between the Lions" uses a line of laughing lions to help build vocabulary and illustrate the meaning of words that typically challenge young children.

Find stories, novels, and poems from more than one hundred authors. Download select works as MP3 files or read or listen to them online. Available selections span a wide range of literature, from nursery rhymes to the philosophy of Aristotle, and a variety of teaching support materials, such as graphic organizers, are included for a limited number of titles.

This resource presents the text of one of Aristotle's "Physics can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter has downloadable support material which focuses on various reading skills and strategies.

The text of a memoir of life at Fort Jefferson in the Dry Tortugas during the Civil War.The text can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter has downloadable support material which focuses on various reading skills and strategies.

This resource presents the text of Richard Barnum's children's story, "Squinty, the Comical Pig." The text can be read online or downloaded by individual chapters in MP3 or PDF format. In addition, each chapter has downloadable support material which focuses on various reading skills and strategies.