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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is...
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An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
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It is convenient to consider the body's structures in terms of fundamental levels of organization that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, and organisms.
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Related Experiment Video

Updated: Mar 6, 2026

Author Spotlight: Advancements in 3D Optical Imaging for Comprehensive Body Composition Assessment in Modern Research
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The visible human project®: From body to bits.

Michael J Ackerman

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 9, 2017
    PubMed
    Summary

    The Visible Human Project created detailed 3D anatomical models from cross-sectional images. This foundational dataset has enabled numerous applications and further research in medical imaging.

    Area of Science:

    • Anatomical Imaging
    • Medical Visualization
    • Digital Anatomy

    Background:

    • The U.S. National Library of Medicine initiated the Visible Human Project in the mid-1990s.
    • This project aimed to create comprehensive digital anatomical databases.

    Purpose of the Study:

    • To develop high-resolution 3D anatomical models of male and female human bodies.
    • To establish a robust image database for anatomical research and visualization.

    Main Methods:

    • Acquisition and development of a large-scale anatomical image database.
    • Utilizing cross-sectional imaging for detailed anatomical reconstruction.
    • Creating separate databases for male (15 GB) and female (39 GB) anatomy.

    Main Results:

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    • Reconstruction of 3D male and female anatomy with sub-millimeter accuracy.
    • Development of a significant anatomical image database.
    • Enabled the creation of various products and applications based on the dataset.

    Conclusions:

    • The Visible Human Project has been a cornerstone for anatomical research and medical visualization.
    • The project's legacy includes driving further image research and the development of open-source toolkits.
    • The dataset continues to influence medical imaging technologies and commercial products.