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Math & Physical Science

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  1. About Time

    About Time - A First Look at Time and Clocks

    The earliest people divided time into two intervals, nighttime and daytime. Today’s atomic clocks divide time into picoseconds—trillionths of a second! How did we get from there to here? Paperback, 32 pages. Learn More
    $6.95
    EM30
    In Stock
  2. Physical & Chemical Changes

    Physical & Chemical Changes - From In-Print For Children

    Whether living or non-living, everything experiences change. Learning to distinguish between physical and chemical changes is an important step for further exploration of chemistry. Children sort the picture cards under labels that clearly define physical and chemical changes. Learn More
    $14.95
    EM65
    In Stock

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