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Your guide to physics on the web. physics.org is the place to be if you have a burning physics question, or if you just want to browse articles and interactive features about physics

Final answers. Numeracy and numerical culture. Mathematics and physics. Physical measurements and Units. Weights and measures. Historical metrology.

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Yahoo! Answers is a new way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

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The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world

World