Physical immortality is a state of life that allows a person to avoid death and maintain conscious thought. It can mean the unending existence of a person from a physical source other than organic life, such as a computer. Pursuit of physical immortality before the advent of modern science included
alchemists, who sought to create the
Philosopher's Stone, and various cultures' legends such as the
Fountain of Youth or the
Peaches of Immortality inspiring attempts at discovering an
elixir of life. Modern scientific trends, such as
cryonics,
digital immortality, breakthroughs in
rejuvenation, or predictions of an impending
technological singularity, to achieve genuine human physical immortality, must still overcome all causes of death to succeed.
Causes of death There are three main causes of death:
natural aging,
disease, and
injury. Such issues can be resolved with the solutions provided in research to any end providing such alternate theories at present that require unification.
Aging Aubrey de Grey, a leading researcher in the field, defines
aging as "a collection of cumulative changes to the
molecular and
cellular structure of an adult
organism, which result in essential
metabolic processes, but which also, once they progress far enough, increasingly disrupt metabolism, resulting in
pathology and death." The current causes of aging in humans are cell loss (without replacement),
DNA damage,
oncogenic nuclear mutations and
epimutations, cell
senescence,
mitochondrial mutations,
lysosomal aggregates, extracellular aggregates, random extracellular cross-linking,
immune system decline, and
endocrine changes. Eliminating aging would require finding a solution to each of these causes, a program de Grey calls
engineered negligible senescence. There is also a huge body of knowledge indicating that change is characterized by the loss of molecular fidelity.
Disease Disease is theoretically surmountable by technology. In short, it is an abnormal condition affecting the body of an organism, something the body should not typically have to deal with its natural make up. Human understanding of
genetics is leading to cures and treatments for a myriad of previously incurable diseases. The mechanisms by which other diseases do damage are becoming better understood. Sophisticated methods of detecting diseases early are being developed.
Preventative medicine is becoming better understood. Neurodegenerative diseases like
Parkinson's and
Alzheimer's may soon be curable with the use of
stem cells. Breakthroughs in
cell biology and
telomere research are leading to treatments for cancer.
Vaccines are being researched for AIDS and
tuberculosis. Genes associated with
type 1 diabetes and certain types of cancer have been discovered, allowing for new therapies to be developed. Artificial devices attached directly to the
nervous system may restore sight to the blind. Drugs are being developed to treat a myriad of other diseases and ailments. There has been a push recently to classify aging as a disease.
Trauma Physical trauma would remain as a threat to perpetual physical life, as an otherwise immortal person would still be subject to unforeseen accidents or catastrophes. The speed and quality of
paramedic response remains a determining factor in surviving severe trauma. A body that could automatically repair itself from severe trauma, such as speculated uses for
nanotechnology, would mitigate this factor. The brain cannot be risked to trauma if a continuous physical life is to be maintained. This aversion to trauma risk to the brain would naturally result in significant behavioral changes that would render physical immortality undesirable for some people.
Biological immortality s (grey) capped by telomeres (white) Biological immortality is an absence of aging. Specifically it is the absence of a sustained increase in
rate of mortality as a function of chronological age. A cell or organism that does not experience aging, or ceases to age at some point, is biologically immortal.
Biologists have chosen the word "immortal" to designate cells that are not limited by the
Hayflick limit, where cells no longer divide because of
DNA damage or shortened
telomeres. The first and still most widely used immortal cell line is
HeLa, developed from cells taken from the malignant cervical tumor of
Henrietta Lacks without her consent in 1951. Prior to the 1961 work of
Leonard Hayflick, there was the erroneous belief fostered by
Alexis Carrel that all normal
somatic cells are immortal. By preventing cells from reaching senescence one can achieve biological immortality; telomeres, a "cap" at the end of DNA, are thought to be the cause of cell aging. Every time a cell divides the telomere becomes a bit shorter; when it is finally worn down, the cell is unable to split and dies.
Telomerase is an enzyme which rebuilds the telomeres in stem cells and cancer cells, allowing them to replicate an infinite number of times. No definitive work has yet demonstrated that telomerase can be used in human somatic cells to prevent healthy tissues from aging. On the other hand, scientists hope to be able to grow organs with the help of stem cells, allowing organ transplants without the risk of rejection, another step in extending human life expectancy. These technologies are the subject of ongoing research, and are not yet realized.
Biologically immortal species Life defined as biologically immortal is still susceptible to causes of death besides aging, including disease and trauma, as defined above. Notable immortal species include: •
Bacteria – Bacteria reproduce through
binary fission. A parent bacterium splits itself into two identical daughter cells which eventually then split themselves in half. This process repeats, thus making the bacterium essentially immortal. A 2005
PLoS Biology paper suggests that after each division the daughter cells can be identified as the older and the younger, and the older is slightly smaller, weaker, and more likely to die than the younger. •
Turritopsis dohrnii, a jellyfish (phylum
Cnidaria, class
Hydrozoa, order
Anthoathecata), after becoming a sexually mature adult, can transform itself back into a
polyp using the cell conversion process of
transdifferentiation.
Turritopsis dohrnii repeats this cycle, meaning that it may have an
indefinite lifespan. •
Hydra is a
genus belonging to the phylum
Cnidaria, the class
Hydrozoa and the order
Anthomedusae. They are simple fresh-water
predatory animals possessing
radial symmetry.
Evolution of aging As the existence of biologically immortal species demonstrates, there is no
thermodynamic necessity for senescence: a defining feature of life is that it takes in
free energy from the environment and unloads its
entropy as waste. Living systems can even build themselves up from seed, and routinely repair themselves. Aging is therefore presumed to be a byproduct of
evolution, but why mortality should be selected for remains a subject of research and debate.
Programmed cell death and the telomere "end replication problem" are found even in the earliest and simplest of organisms. This may be a tradeoff between selecting for cancer and selecting for aging. Modern theories on the evolution of aging include the following: • Mutation accumulation is a theory formulated by
Peter Medawar in 1952 to explain how evolution would select for aging. Essentially, aging is never selected against, as organisms have offspring before the mortal mutations surface in an individual. •
Antagonistic pleiotropy is a theory proposed as an alternative by
George C. Williams, a critic of Medawar, in 1957. In antagonistic pleiotropy, genes carry effects that are both beneficial and detrimental. In essence this refers to genes that offer benefits early in life, but exact a cost later on, i.e. decline and death. • The disposable soma theory was proposed in 1977 by
Thomas Kirkwood, which states that an individual body must allocate energy for metabolism, reproduction, and maintenance, and must compromise when there is food scarcity. Compromise in allocating energy to the repair function is what causes the body gradually to deteriorate with age, according to Kirkwood.
Immortality of the germline Individual organisms ordinarily age and die, while the germlines which connect successive generations are potentially immortal. The basis for this difference is a fundamental problem in biology. The Russian biologist and historian
Zhores A. Medvedev considered that the accuracy of
genome replicative and other synthetic systems alone cannot explain the immortality of
germlines. Rather Medvedev thought that known features of the biochemistry and genetics of
sexual reproduction indicate the presence of unique information maintenance and restoration processes at the different stages of
gametogenesis. In particular, Medvedev considered that the most important opportunities for information maintenance of
germ cells are created by
recombination during meiosis and
DNA repair; he saw these as processes within the germ cells that were capable of restoring the integrity of
DNA and
chromosomes from the types of damage that cause irreversible aging in
somatic cells.
Prospects for human biological immortality Life-extending substances Some scientists believe that boosting the amount or proportion of
telomerase in the body, a naturally forming enzyme that helps maintain the protective caps at the ends of
chromosomes, could prevent cells from dying and so may ultimately lead to extended, healthier lifespans. A team of researchers at the Spanish National Cancer Centre (
Madrid) tested the hypothesis on mice. It was found that those mice which were "
genetically engineered to produce 10 times the normal levels of telomerase lived 50% longer than normal mice". In normal circumstances, without the presence of telomerase, if a cell divides repeatedly, at some point all the progeny will reach their
Hayflick limit. With the presence of telomerase, each dividing cell can replace the lost bit of
DNA, and any single cell can then divide unbounded. While this unbounded growth property has excited many researchers, caution is warranted in exploiting this property, as exactly this same unbounded growth is a crucial step in enabling cancerous growth. If an organism can replicate its body cells faster, then it would theoretically stop aging.
Embryonic stem cells express telomerase, which allows them to divide repeatedly and form the individual. In adults, telomerase is highly expressed in cells that need to divide regularly (e.g., in the immune system), whereas most
somatic cells express it only at very low levels in a cell-cycle dependent manner.
Technological immortality, biological machines, and "swallowing the doctor" Technological immortality may be possible by scientific advances in a variety of fields: nanotechnology, emergency room procedures, genetics,
biological engineering,
regenerative medicine,
microbiology, etc. Contemporary life spans in the advanced industrial societies are already markedly longer than those of the past because of better nutrition, availability of health care, standard of living and bio-medical scientific advances. Technological immortality predicts further progress for the same reasons over the near term. An important aspect of current scientific thinking about immortality is that some combination of
human cloning, cryonics or nanotechnology will play an essential role in extreme life extension.
Robert Freitas, a nanorobotics theorist, suggests tiny medical
nanorobots could be created to go through human bloodstreams, find dangerous things like cancer cells and bacteria, and destroy them. Freitas anticipates that gene-therapies and nanotechnology will eventually make the human body effectively self-sustainable and capable of living indefinitely in empty space, short of severe brain trauma. This supports the theory that we will be able to continually create biological or synthetic replacement parts to replace damaged or dying ones. Future advances in
nanomedicine could give rise to
life extension through the repair of many processes thought to be responsible for aging.
K. Eric Drexler, one of the founders of
nanotechnology, postulated cell repair devices, including ones operating within cells and using as yet hypothetical
biological machines, in his 1986 book
Engines of Creation.
Raymond Kurzweil, a
futurist and
transhumanist, stated in his book
The Singularity Is Near that he believes that advanced medical
nanorobotics could completely remedy the effects of aging by 2030. According to
Richard Feynman, it was his former graduate student and collaborator
Albert Hibbs who originally suggested to him (circa 1959) the idea of a
medical use for Feynman's theoretical micromachines (see
biological machine). Hibbs suggested that certain repair machines might one day be reduced in size to the point that it would, in theory, be possible to (as Feynman put it) "swallow the doctor". The idea was incorporated into Feynman's 1959 essay ''
There's Plenty of Room at the Bottom.''
Cryonics Cryonics, the practice of preserving organisms (either intact specimens or only their brains) for possible future revival by storing them at cryogenic temperatures where metabolism and decay are almost completely stopped, can be used to 'pause' for those who believe that life extension technologies will not develop sufficiently within their lifetime. Ideally, cryonics would allow clinically dead people to be brought back in the future after cures to the patients' diseases have been discovered and
aging is reversible. Modern cryonics procedures use a process called
vitrification which creates a glass-like state rather than
freezing as the body is brought to low temperatures. This process reduces the risk of ice crystals damaging the cell-structure, which would be especially detrimental to cell structures in the brain, as their minute adjustment evokes the individual's mind.
Mind-to-computer uploading One idea that has been advanced involves
uploading an individual's habits and memories via
direct mind-computer interface. The individual's memory may be loaded to a computer or to a new organic body.
Extropian futurists like Moravec and
Kurzweil have proposed that, thanks to
exponentially growing computing power, it will someday be possible to
upload human consciousness onto a computer system, and exist indefinitely in a virtual environment. This could be accomplished via advanced cybernetics, where computer hardware would initially be installed in the brain to help sort memory or accelerate thought processes. Components would be added gradually until the person's entire brain functions were handled by artificial devices, avoiding sharp transitions that would lead to issues of
identity, thus running the risk of the person to be declared dead and thus not be a legitimate owner of his or her property. After this point, the human body could be treated as an optional accessory and the program implementing the person could be transferred to any sufficiently powerful computer. Another possible mechanism for mind upload is to perform a detailed scan of an individual's original, organic brain and simulate the entire structure in a computer. What level of detail such scans and simulations would need to achieve to emulate awareness, and whether the scanning process would destroy the brain, is still to be determined. It is suggested that achieving immortality through this mechanism would require specific consideration to be given to the role of
consciousness in the functions of the
mind. An uploaded mind would only be a copy of the original mind, and not the conscious mind of the living entity associated in such a transfer. Without a simultaneous upload of consciousness, the original living entity remains mortal, thus not achieving true immortality. Research on
neural correlates of consciousness is yet inconclusive on this issue. Whatever the route to mind upload, persons in this state could then be considered essentially immortal, short of loss or traumatic destruction of the machines that maintained them.
Cybernetics Transforming a human into a
cyborg can include
brain implants or extracting a human processing unit and placing it in a robotic life-support system. Even replacing biological organs with robotic ones could increase life span (e.g., pacemakers), and depending on the definition, many technological upgrades to the body, like genetic modifications or the addition of nanobots, would qualify an individual as a cyborg. Some people believe that such modifications would make one impervious to aging and disease and theoretically immortal unless killed or destroyed.
Digital immortality ==Religious views==