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  1. Science Education

    1. Homework and Coursework Questions

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  2. Physics

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    2. Classical Physics

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    5. Atomic & Condensed Matter

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    6. High Energy, Nuclear, Particle Physics

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    7. Beyond the Standard Model

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  3. Astronomy and Cosmology

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    2. Cosmology

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      Latest: Why hasn't the light from the CMB already passed us?

  4. Mathematics

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      Latest: Calculating area of multiple connected circles

    2. Calculus

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    3. Differential Equations

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    4. Topology and Analysis

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    5. Linear and Abstract Algebra

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    6. Differential Geometry

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    7. Set Theory, Logic, Probability, Statistics

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      Latest: Counterexample Required (Standard Notations)

    8. Math Software and LaTeX

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  5. Engineering

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    4. Materials and Chemical Engineering

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    5. Nuclear Engineering

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  6. Other Sciences

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    2. Programming and Computer Science

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    3. Biology and Medical

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    4. Computing and Technology

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    5. Earth

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  7. PF Lounge

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    2. Science Fiction and Fantasy

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      Latest: An Introduction