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  • Density and Buoyancy
    General Science

    Density and Buoyancy

    Density is a fundamental physical property of matter. This module introduces the concept of density,...

  • Mass Extinctions
    Biology

    Mass Extinctions

    The most recent mass extinction was about 65 million years ago, well before humans began...

  • Substances
    Chemistry

    Substances

    This module explores substances through hypothetical and real-world examples. Substances are broadly classified as pure...

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