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

Science, astronomy, and space flight news, science and renewable energy encyclopedias. Maintained by science writer David Darling, Ph.D.

Welcome to the third edition of The Encyclopedia of Science Fiction. Our aim is to provide a comprehensive, scholarly, and critical guide to science fiction in all its forms.

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.

America

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Founded in 1987, IGI Global (IGI) is an international publishing company specializing in high-quality research publications in the fields of computer science and information technology management.

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

Fact Monster is a free reference site for students, teachers, and parents. Get homework help and find facts on thousands of subjects, including sports, entertainment, geography, history, biography, education, and health.

Spanning the entire spectrum of life sciences, the Encyclopedia of Life Sciences (eLS) features more than 4,800 specially commissioned and peer-reviewed articles. This alone makes it an essential read for life scientists as well as a valuable resourc...