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  • The Metric System
    General Science

    The Metric System

    The metric system is the standard system of measurement in science. This module describes the...

  • The Phosphorus Cycle
    Earth Science

    The Phosphorus Cycle

    All living organisms need phosphorous to survive and grow. This module describes forms that phosphorous...

  • Percy Lavon Julian
    Scientists and Research

    Percy Lavon Julian

    The module traces the life and career of organic chemist Percy Julian, who developed a...

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    The Process of Science Revised Edition

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