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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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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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Related Experiment Video

Updated: May 5, 2026

Setup and Execution of the Rapid Cycle Deliberate Practice Death Notification Curriculum
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[Near death experiences].

Francisco José Rubia Vila

    Anales De La Real Academia Nacional De Medicina
    |December 4, 2013
    PubMed
    Summary

    Near Death Experiences (NDEs) are often linked to the afterlife. However, neuroscience suggests these profound events may stem from brain activity, specifically limbic system hyperactivity due to oxygen or carbon dioxide imbalances.

    Area of Science:

    • Neuroscience
    • Psychology
    • Cognitive Science

    Background:

    • Near Death Experiences (NDEs) are subjective accounts from individuals clinically dead but revived.
    • Traditionally, NDEs are interpreted as evidence for the soul and afterlife.
    • Modern neuroscience seeks to explain NDEs through biological mechanisms.

    Discussion:

    • NDEs share similarities with mystical experiences and altered states of consciousness.
    • These similarities suggest a potential neurological basis for NDEs.
    • Hypotheses point to hyperactivity in limbic structures as a possible cause.

    Key Insights:

    • Neuroscience offers a scientific perspective on Near Death Experiences.
    • Limbic system hyperactivity, potentially caused by anoxia or hypercapnia, is a leading hypothesis.

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  • This perspective challenges traditional spiritual interpretations of NDEs.

    • Outlook:

    • Further research into brain substrates of NDEs is warranted.
    • Investigating the precise mechanisms of limbic hyperactivity could clarify NDE phenomena.
    • This research may bridge the gap between subjective experience and objective neurological findings.