Explains what diffraction and interference are, and what kinds of patterns are produced when light waves pass through a single slit, a double slit, or a diffraction grating. Includes three problems for students to try, with solutions...

July 23, 1846 Henry David Thoreau is arrested and jailed for civil disobedience against the Massachusetts Poll Tax. Take a look at the events of that day as well as the life and legacy of Thoreau.

Official site for the Vatican, the headquarters for the Roman Catholic Church. Includes information on the Vatican Library, home to thousands of historic documents, the Vatican museums, and historical and current information on the Popes...

Use this calculator to figure out how much water you are using at your home.

Meet Canadians from several walks of life who are working to improve conditions in third world countries. Included are individual profiles and stories.

This site provides links to descriptions of various environmental research projects being done to develop the best methods for treating different types of contaminated sediments.

This is an interactive inquiry where students will investigate the speed of an object and the energy it exerts as it crashes into other objects. Students will understand that the more speed an object has, the more energy it has in a...

A comprehensive site about the Green Peace organization.

Collect facts, engage in simulations, and explore Mars with the tools provided.

Information, stories, historical images, and documents about the discovery of gold in Alaska in the late nineteenth century.

Links to PARCC practice test answer keys, alignment documents, and text complexity guides for grades and up, for both Math and ELA/Literacy.

Canada's current cabinet members are listed here along with the portfolio each member looks after. The mandate of the cabinet is also thoroughly explained.

The Coelophysis is New Mexico's official state fossil. It lived in the late Triassic Period and has only been found in New Mexico. Popular questions about this dinosaur are answered here. In addition, there are numerous documents about...

Sir William Blackstone, attorney at law, unsuspecting, created quite a stir in England when he began a lecture series in 1758. His delivery may have led to the turning point in the development of colonies in the New World and directly...

This textbook chapter looks at the role of temperature in sustaining life on Earth and on weather and climate. It discusses the Earth's movements and the seasons, the circulation of the oceans, wind and weather, and the water cycle....

Explore the ancient Mayan city of Uxmal.

Click on the picture of the rabbit and learn about the various parts of the rabbit and their functionality. Other interesting facts about rabbits are presented on this page.

An exhaustive, searchable website with original court records on 300 legal petitions for freedom by people of color, originally filed in St. Louis courts between 1814 and 1860.

Everything you need to know about this life of George Washington is included on this site. This comprehensive site allows you to read short summaries of different events in Washington's life. Click the links following the descriptions...

Washington began his involvement with the French and Indian War by volunteering to be a Britain's emissary to the French to order them to leave British territory. However, he became mired in the conflict and ended the war when the French...

Official site for USA Baseball including the Olympic team. It offers a variety of information and links to other information resources.

This site provides a biography of Oscar Robertson, also known as "The Big O." It includes information on his early life, college basketball career, NBA career, and life after retirement.

Ecotourism company that provides canopy tours at four unique tropical locations in the Caribbean and Central America.

Whether your kids are walking to school, the park or a friend's house, here are a few simple tips to make sure they get there safely.