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Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

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.

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Free math teaching resources, math games, center activities and math journal tasks for K-5 aligned with the Common Core State Standards for Mathematics.

Archive of government documents and public information regarding national security, finance, international relations, government surveillance, and continuity of government operations.

Richard J. Kinch, Software Publisher, publishes TrueTeX, a Windows implementation of the TeX typesetting system.

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MIT is devoted to the advancement of knowledge and education of students in areas that contribute to or prosper in an environment of science and technology.

Contains the entire v3.5 d20 System Reference Document and is fully indexed, hyperlinked, searchable, and accessible.

Articles by fire officers covering a wide variety of areas that are important to today