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An expanding collection of freely available, interactive Demonstrations in math, science, and many other areas--at all levels from elementary education to front-line research.

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An affordable high bandwidth mixed signal PC based digital oscilloscope logic analyzer.

Scientific physics forums for professionals and students to discuss serious issues and topics regarding physics in theory, practice, study and reality. Students can also find help for homework and career perspectives

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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.