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Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

HowStuffWorks Science has explanations and colorful illustrations related to earth science, life science, and other wonders of the physical world.

The largest and most trusted free online thesaurus. Quickly find accurate and up-to-date synonyms, antonyms, and related words at Thesaurus.com. Synonym dictionary, antonym dictionary, words synonyms.

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

The State of Arizona Department of Mines and Mineral Resources is a non-regulatory State agency that aids in the promotion and development of Arizona

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

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

JoVE, Journal of Visualized Experiments, is the first PubMed-indexed video methods journal in biology.