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The Physics Classroom is an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics principles discussed in a first-year high school physics course.

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

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

This is a page in The Physics Hypertextbook. It is a work in progress.

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...

YouTube is a place to discover, watch, upload and share videos.

Prelude If you are a professional writer ? i.e., if someone else is getting paid to worry about how your words are formatted and printed ? Emacs ?

Science360 Knowledge Network immerses visitors in the latest wonders of science, engineering, technology and math. We gather the latest science videos provided by scientists, colleges and universities, science and engineering centers, the National Sc...

Eric Weisstein

The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. Despite being the work of one man, Salman Khan, this 1600+ video library is the most-used educational video resource as measure...