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TFD Encyclopedia includes Computer Desktop Encyclopedia, Columbia Encyclopedia and many other great sources.

Medical Dictionary is intended for use by healthcare consumers, students, and professionals as well as anyone who wants to keep up with the burgeoning array of terminology found in today’s medical news. By staying clear of jargon, the dictionary o...

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

From Britannica, explore the most trusted online kids encyclopedia for homework help and general knowledge information on a variety of subjects like science, history, the arts, math, etc.

Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library.

National Geographic Education brings geography, social studies and science to life. Using real-world examples and National Geographic's rich media, educators, families, and students learn about the world and the people in it.

Surviving in an urban setting and the modern world. Survival in in other cities, in the army, in emergency situations. Natural disasters and man-made disasters. For the future of humanity.

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Infoplease.com, a free, authoritative, and respected reference for Internet users, provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus. Infoplease.com contains facts on all subjects including sports, entertainment, techno...

International führender Wissenschaftsverlag - Wissenschaft, Technik, Medizin, Architektur, Wirtschaft und Verkehr - Zeitschriften, Bücher und EContent.

Activate study mode with book reviews, free essays, course notes, flashcards and other study tools. Millions of students use us to help with their homework assignments.

Scholastic.com, the flagship Internet portal for the world