Excellent source for a vast array of information on the colorful sea slugs. Topics like localities, feeding, body shape, mating, and an entire list of species complete with photos are provided.

Newspaper-formatted Devonian Times reports on the ongoing exploration and research being conducted at Red Hill, a Devonian-period fossil site located in central Pennsylvania, where an impressive array of fossilized animal and plant life...

These two resource guides are a great way to learn about the full array of assistive devices and services available for a wide variety of special hearing and vision needs for any age.

The Jewish Museum presents a virtual array of artwork focused on Jewish immigration to the United States. Classroom activities are provided in conjection with art pieces.

Online home of the PBS documentary "The Perilous Fight" provides access to an eclectic array of color photographs and films of World War II at home and abroad. Overviews, contextual clues, maps, letters, and similar resources can be...

Celebrate National Hispanic Heritage Month, September 15-October 15, by checking out the array of material on this site hosted by the Library of Congress. You can explore the exhibits and collections dedicated to Hispanic American...

The Schools section of the Birmingham Museums site provides an array of e-learning and teaching resources along with general information relating to a visit to one of the Birmingham Museums or Art Gallery. Contains educational...

This site from Digital Library for Earth System Education provides materials for students and teachers on a huge array of topics. Search site by topic, grade level, and desired output (such as lesson plan, case study, assessment or...

Primary sources related to American art and artists, such as letters, diaries, manuscripts, photographs, oral histories, and sketches, can be found in this impressive archive. An array of tools make it easy to search the collections, and...

When state and local authorities fail to uphold the Federal Court orders for integration at Central High School, President Dwight D. Eisenhower sent in federal troops to enforce those orders. Using an array of photos and primary source...

This website, developed by the National Museum of American History, provides standards-based online resources for teaching and learning American history. An array of teacher lessons, activities, interactive media, and artifacts tag this...

Access any one of twenty-five lectures, in audio, video, or text format, from a university-level course in literary analysis and critical literary theories. Considers postmodernism, New Criticism, feminism, deconstructionism, and an...

Interdisciplinary multimedia course, in thirteen units, on environmental science. Each unit encompasses a thirty-minute video, an accompanying textbook chapter, and an array of visuals and animations. With five interactive labs, a...

Photographic essay features an array of photos, primary source documents, and first-hand video testimony from the man who attempted to inform the world about the existence of the Holocaust.

Explore four online exhibits detailing the story behind the construction of the Eiffel Tower. The story is told using an array of documents and photos.

Revolution in Berlin is the story of the 40 days leading up to the fall of the wall told in a stunning timeline that includes an array of photographs and primary source documents.

This National Gallery of Art site contains information about the life of Edgar Degas as well as a large array of his works. The numerous images are worth the visit!

The work of a team of Russian historians, writers, designers, and programmers, this multimedia project explores the Eastern Front of World War II in great detail. The title of the site reflects the Russian name for the conflict in the...

This in-depth site provides middle and high school science teachers with a wide array of free instructional resources, such as slide sets, streaming video presentations, and laboratory activities. Information is provided that is...

This resource provides materials for teachers on a huge array of topics. Search site by topic, grade level, and desired output (such as lesson plan, case study, assessment or tutorial). Site is focused on earth science, geography, and...

The Newbury House Dictionary provides simple and clear definitions. Also includes sample sentences, idioms, and a wide array of cultural facts and figures. Students may also view photographs related to the words.

Vast array of quizzes and self-study exercises based on idioms and idiomatic expressions, categorized in a variety of ways (beginning with A, B, etc., by keyword, or by association with other groupings). Great practice for the ELL/ESL...

Find an array of environmental and science-based lesson plans, activities and ideas from the EPA, other federal agencies, and external organizations.

Harry and his students look at various arrangements of classroom desks in this video from Cyberchase.