La inmortalidad o vida eterna supone la existencia indefinida o infinita que consigue superar la muerte. A lo largo de la historia, los seres humanos han tenido el deseo de vivir para siempre. La inmortalidad es considerada entre algunos filósofos como la respuesta a la angustia y al miedo que produce en el ser humano la conciencia de su mortalidad y contingencia. Ese ansia crearía y desarrollaría el concepto de inmortalidad; y constituiría además el núcleo de la antropología de la religión.

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Immortality is eternal life, the ability to live forever. Natural selection has developed potential biological immortality in at least one species, Turritopsis dohrnii. Certain scientists, futurists, and philosophers have theorized about the immortality of the human body (either through an immortal cell line researched or else deeper contextual understanding in advanced fields that have certain scope in the proposed long term reality that can be attained such as per mentioned in the reading of an article or scientific documentation of such a proposed idea would lead to), and advocate that human immortality is achievable in the first few decades of the 21st century, whereas other advocates believe that life extension is a more achievable goal in the short term, with immortality awaiting further research breakthroughs into an indefinite future. The absence of aging would provide humans with biological immortality, but not invulnerability to death by physical trauma; although mind uploading could solve that issue if it proved possible. Whether the process of internal endoimmortality would be delivered within the upcoming years depends chiefly on research (and in neuron research in the case of endoimmortality through an immortalized cell line) in the former view and perhaps is an awaited goal in the latter case. In religious contexts, immortality is often stated to be one of the promises of God (or other deities) to human beings who show goodness or else follow divine law. What form an unending human life would take, or whether an immaterial soul exists and possesses immortality, has been a major point of focus of religion, as well as the subject of speculation, fantasy, and debate.

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