Death is the cessation of all biological functions that sustain a living organism. Phenomena which commonly bring about death include biological aging (senescence), predation, malnutrition, disease, suicide, homicide, starvation, dehydration, and accidents or trauma resulting in terminal injury. Bodies of living organisms begin to decompose shortly after death.
Death – particularly the death of humans – has commonly been considered a sad or unpleasant occasion, due to the affection for the being that has died and the termination of social and familial bonds with the deceased. Other concerns include fear of death, necrophobia, anxiety, sorrow, grief, emotional pain, depression, sympathy, compassion, solitude, or saudade. Many culture and religions have the idea of an afterlife, and also hold the idea of reward or judgement and punishment for past sin.
The word death comes from Old English dēaþ, which in turn comes from Proto-Germanic *dauþuz (reconstructed by etymological analysis). This comes from the Proto-Indo-European stem *dheu- meaning the "Process, act, condition of dying".
The concept and symptoms of death, and varying degrees of delicacy used in discussion in public forums, have generated numerous scientific, legal, and socially acceptable terms or euphemisms for death. When a person has died, it is also said they have passed away, passed on, expired, or are gone, among numerous other socially accepted, religiously specific, slang, and irreverent terms. Bereft of life, the dead person is then a corpse, cadaver, a body, a set of remains, and when all flesh has rotted away, a skeleton. The terms carrion and carcass can also be used, though these more often connote the remains of non-human animals. As a polite reference to a dead person, it has become common practice to use the participle form of "decease", as in the deceased; another noun form is decedent. The ashes left after a cremation are sometimes referred to by the neologism cremains, a portmanteau of "cremation" and "remains".
Senescence refers to a scenario when a living being is able to survive all calamities, but eventually dies due to causes relating to old age. Animal and plant cells normally reproduce and function during the whole period of natural existence, but the aging process derives from deterioration of cellular activity and ruination of regular functioning. Aptitude of cells for gradual deterioration and mortality means that cells are naturally sentenced to stable and long-term loss of living capacities, even despite continuing metabolic reactions and viability. In the United Kingdom, for example, nine out of ten of all the deaths that occur on a daily basis relates to senescence, while around the world it accounts for two-thirds of 150,000 deaths that take place daily (Hayflick & Moody, 2003).
Almost all animals who survive external hazards to their biological functioning eventually die from biological aging, known in life sciences as "senescence". Some organisms experience negligible senescence, even exhibiting biological immortality. These include the jellyfish Turritopsis dohrnii, the hydra, and the planarian. Unnatural causes of death include suicide and homicide. From all causes, roughly 150,000 people die around the world each day. Of these, two thirds die directly or indirectly due to senescence, but in industrialized countries—such as the United States, the United Kingdom, and Germany—the rate approaches 90%, i.e., nearly nine out of ten of all deaths are related to senescence.
Physiological death is now seen as a process, more than an event: conditions once considered indicative of death are now reversible. Where in the process a dividing line is drawn between life and death depends on factors beyond the presence or absence of vital signs. In general, clinical death is neither necessary nor sufficient for a determination of legal death. A patient with working heart and lungs determined to be brain dead can be pronounced legally dead without clinical death occurring. As scientific knowledge and medicine advance, formulating a precise medical definition of death becomes more difficult.
Signs of death or strong indications that a warm-blooded animal is no longer alive are:
- Respiratory arrest (no breathing)
- Cardiac arrest (no pulse)
- Pallor mortis, paleness which happens in the 15–120 minutes after death
- Livor mortis, a settling of the blood in the lower (dependent) portion of the body
- Algor mortis, the reduction in body temperature following death. This is generally a steady decline until matching ambient temperature
- Rigor mortis, the limbs of the corpse become stiff (Latin rigor) and difficult to move or manipulate
- Decomposition, the reduction into simpler forms of matter, accompanied by a strong, unpleasant odor.
Problems of definition
The concept of death is a key to human understanding of the phenomenon. There are many scientific approaches to the concept. For example, brain death, as practiced in medical science, defines death as a point in time at which brain activity ceases.
One of the challenges in defining death is in distinguishing it from life. As a point in time, death would seem to refer to the moment at which life ends. Determining when death has occurred requires drawing precise conceptual boundaries between life and death. This is difficult, due to there being little consensus on how to define life. This general problem applies to the particular challenge of defining death in the context of medicine.
It is possible to define life in terms of consciousness. When consciousness ceases, a living organism can be said to have died. One of the flaws in this approach is that there are many organisms which are alive but probably not conscious (for example, single-celled organisms). Another problem is in defining consciousness, which has many different definitions given by modern scientists, psychologists and philosophers. Additionally, many religious traditions, including Abrahamic and Dharmic traditions, hold that death does not (or may not) entail the end of consciousness. In certain cultures, death is more of a process than a single event. It implies a slow shift from one spiritual state to another.
Other definitions for death focus on the character of cessation of something.[clarification needed] In this context "death" describes merely the state where something has ceased, for example, life. Thus, the definition of "life" simultaneously defines death.
Historically, attempts to define the exact moment of a human's death have been subjective, or imprecise. Death was once defined as the cessation of heartbeat (cardiac arrest) and of breathing, but the development of CPR and prompt defibrillation have rendered that definition inadequate because breathing and heartbeat can sometimes be restarted. Events which were causally linked to death in the past no longer kill in all circumstances; without a functioning heart or lungs, life can sometimes be sustained with a combination of life support devices, organ transplants and artificial pacemakers.
Today, where a definition of the moment of death is required, doctors and coroners usually turn to "brain death" or "biological death" to define a person as being dead; people are considered dead when the electrical activity in their brain ceases. It is presumed that an end of electrical activity indicates the end of consciousness. Suspension of consciousness must be permanent, and not transient, as occurs during certain sleep stages, and especially a coma. In the case of sleep, EEGs can easily tell the difference.
The category of "brain death" is seen as problematic by some scholars. For instance, Dr. Franklin Miller, senior faculty member at the Department of Bioethics, National Institutes of Health, notes: "By the late 1990s... the equation of brain death with death of the human being was increasingly challenged by scholars, based on evidence regarding the array of biological functioning displayed by patients correctly diagnosed as having this condition who were maintained on mechanical ventilation for substantial periods of time. These patients maintained the ability to sustain circulation and respiration, control temperature, excrete wastes, heal wounds, fight infections and, most dramatically, to gestate fetuses (in the case of pregnant "brain-dead" women)."
Those people maintaining that only the neo-cortex of the brain is necessary for consciousness sometimes argue that only electrical activity should be considered when defining death. Eventually it is possible that the criterion for death will be the permanent and irreversible loss of cognitive function, as evidenced by the death of the cerebral cortex. All hope of recovering human thought and personality is then gone given current and foreseeable medical technology. At present, in most places the more conservative definition of death – irreversible cessation of electrical activity in the whole brain, as opposed to just in the neo-cortex – has been adopted (for example the Uniform Determination Of Death Act in the United States). In 2005, the Terri Schiavo case brought the question of brain death and artificial sustenance to the front of American politics.
Even by whole-brain criteria, the determination of brain death can be complicated. EEGs can detect spurious electrical impulses, while certain drugs, hypoglycemia, hypoxia, or hypothermia can suppress or even stop brain activity on a temporary basis. Because of this, hospitals have protocols for determining brain death involving EEGs at widely separated intervals under defined conditions.
The death of a person has legal consequences that may vary between different jurisdictions. A death certificate is issued in most jurisdictions, either by a doctor, or by an administrative office upon presentation of a doctor's declaration of death.
There are many anecdotal references to people being declared dead by physicians and then "coming back to life", sometimes days later in their own coffin, or when embalming procedures are about to begin. From the mid-18th century onwards, there was an upsurge in the public's fear of being mistakenly buried alive, and much debate about the uncertainty of the signs of death. Various suggestions were made to test for signs of life before burial, ranging from pouring vinegar and pepper into the corpse's mouth to applying red hot pokers to the feet or into the rectum. Writing in 1895, the physician J.C. Ouseley claimed that as many as 2,700 people were buried prematurely each year in England and Wales, although others estimated the figure to be closer to 800.
In cases of electric shock, cardiopulmonary resuscitation (CPR) for an hour or longer can allow stunned nerves to recover, allowing an apparently dead person to survive. People found unconscious under icy water may survive if their faces are kept continuously cold until they arrive at an emergency room. This "diving response", in which metabolic activity and oxygen requirements are minimal, is something humans share with cetaceans called the mammalian diving reflex.
As medical technologies advance, ideas about when death occurs may have to be re-evaluated in light of the ability to restore a person to vitality after longer periods of apparent death (as happened when CPR and defibrillation showed that cessation of heartbeat is inadequate as a decisive indicator of death). The lack of electrical brain activity may not be enough to consider someone scientifically dead. Therefore, the concept of information-theoretic death has been suggested as a better means of defining when true death occurs, though the concept has few practical applications outside of the field of cryonics.
There have been some scientific attempts to bring dead organisms back to life, but with limited success. In science fiction scenarios where such technology is readily available, real death is distinguished from reversible death.
The leading cause of human death in developing countries is infectious disease. The leading causes in developed countries are atherosclerosis (heart disease and stroke), cancer, and other diseases related to obesity and aging. By an extremely wide margin, the largest unifying cause of death in the developed world is biological aging, leading to various complications known as aging-associated diseases. These conditions cause loss of homeostasis, leading to cardiac arrest, causing loss of oxygen and nutrient supply, causing irreversible deterioration of the brain and other tissues. Of the roughly 150,000 people who die each day across the globe, about two thirds die of age-related causes. In industrialized nations, the proportion is much higher, approaching 90%. With improved medical capability, dying has become a condition to be managed. Home deaths, once commonplace, are now rare in the developed world.
In developing nations, inferior sanitary conditions and lack of access to modern medical technology makes death from infectious diseases more common than in developed countries. One such disease is tuberculosis, a bacterial disease which killed 1.8M people in 2015. Malaria causes about 400–900M cases of fever and 1–3M deaths annually. AIDS death toll in Africa may reach 90–100M by 2025.
According to Jean Ziegler (United Nations Special Reporter on the Right to Food, 2000—Mar 2008), mortality due to malnutrition accounted for 58% of the total mortality rate in 2006. Ziegler says worldwide approximately 62M people died from all causes and of those deaths more than 36M died of hunger or diseases due to deficiencies in micronutrients.
Many leading developed world causes of death can be postponed by diet and physical activity, but the accelerating incidence of disease with age still imposes limits on human longevity. The evolutionary cause of aging is, at best, only just beginning to be understood. It has been suggested that direct intervention in the aging process may now be the most effective intervention against major causes of death.
Selye proposed a unified non-specific approach to many causes of death. He demonstrated that stress decreases adaptability of an organism and proposed to describe the adaptability as a special resource, adaptation energy. The animal dies when this resource is exhausted. Selye assumed that the adaptability is a finite supply, presented at birth. Later on, Goldstone proposed the concept of a production or income of adaptation energy which may be stored (up to a limit), as a capital reserve of adaptation. In recent works, adaptation energy is considered as an internal coordinate on the "dominant path" in the model of adaptation. It is demonstrated that oscillations of well-being appear when the reserve of adaptability is almost exhausted.
In 2012, suicide overtook car crashes for leading causes of human injury deaths in the U.S., followed by poisoning, falls and murder. Causes of death are different in different parts of the world. In high-income and middle income countries nearly half up to more than two thirds of all people live beyond the age of 70 and predominantly die of chronic diseases. In low-income countries, where less than one in five of all people reach the age of 70, and more than a third of all deaths are among children under 15, people predominantly die of infectious diseases.
An autopsy, also known as a postmortem examination or an obduction, is a medical procedure that consists of a thorough examination of a human corpse to determine the cause and manner of a person's death and to evaluate any disease or injury that may be present. It is usually performed by a specialized medical doctor called a pathologist.
Autopsies are either performed for legal or medical purposes. A forensic autopsy is carried out when the cause of death may be a criminal matter, while a clinical or academic autopsy is performed to find the medical cause of death and is used in cases of unknown or uncertain death, or for research purposes. Autopsies can be further classified into cases where external examination suffices, and those where the body is dissected and an internal examination is conducted. Permission from next of kin may be required for internal autopsy in some cases. Once an internal autopsy is complete the body is generally reconstituted by sewing it back together. Autopsy is important in a medical environment and may shed light on mistakes and help improve practices.
A "necropsy" is an older term for a postmortem examination, unregulated, and not always a medical procedure. In modern times the term is more often used in the postmortem examination of the corpses of animals.
Cryonics (from Greek κρύος 'kryos-' meaning 'icy cold') is the low-temperature preservation of animals and humans who cannot be sustained by contemporary medicine, with the hope that healing and resuscitation may be possible in the future.
Cryopreservation of people or large animals is not reversible with current technology. The stated rationale for cryonics is that people who are considered dead by current legal or medical definitions may not necessarily be dead according to the more stringent information-theoretic definition of death. It is proposed that cryopreserved people might someday be recovered by using highly advanced technology.
Some scientific literature supports the feasibility of cryonics. Many other scientists regard cryonics with skepticism. By 2015, more than 300 people have undergone cryopreservation procedures since cryonics was first proposed in 1962.
Life extension refers to an increase in maximum or average lifespan, especially in humans, by slowing down or reversing the processes of aging. Average lifespan is determined by vulnerability to accidents and age or lifestyle-related afflictions such as cancer, or cardiovascular disease. Extension of average lifespan can be achieved by good diet, exercise and avoidance of hazards such as smoking. Maximum lifespan is also determined by the rate of aging for a species inherent in its genes. Currently, the only widely recognized method of extending maximum lifespan is calorie restriction. Theoretically, extension of maximum lifespan can be achieved by reducing the rate of aging damage, by periodic replacement of damaged tissues, or by molecular repair or rejuvenation of deteriorated cells and tissues.
A United States poll found that religious people and irreligious people, as well as men and women and people of different economic classes have similar rates of support for life extension, while Africans and Hispanics have higher rates of support than white people. 38 percent of the polled said they would desire to have their aging process cured.
Researchers of life extension are a subclass of biogerontologists known as "biomedical gerontologists". They try to understand the nature of aging and they develop treatments to reverse aging processes or to at least slow them down, for the improvement of health and the maintenance of youthful vigor at every stage of life. Those who take advantage of life extension findings and seek to apply them upon themselves are called "life extensionists" or "longevists". The primary life extension strategy currently is to apply available anti-aging methods in the hope of living long enough to benefit from a complete cure to aging once it is developed.
"One of medicine's new frontiers: treating the dead", recognizes that cells that have been without oxygen for more than five minutes die, not from lack of oxygen, but rather when their oxygen supply is resumed. Therefore, practitioners of this approach, e.g., at the Resuscitation Science institute at the University of Pennsylvania, "aim to reduce oxygen uptake, slow metabolism and adjust the blood chemistry for gradual and safe reperfusion."
Before about 1930, most people in Western countries died in their own homes, surrounded by family, and comforted by clergy, neighbors, and doctors making house calls. By the mid-20th century, half of all Americans died in a hospital. By the start of the 21st century, only about 20 to 25% of people in developed countries died outside a medical institution. The shift away from dying at home, towards dying in a professionalized medical environment, has been termed the "Invisible Death". The "Invisible Death" process was extremely slow and infinitesimal. It took many years to shift to this new location where dying was commonly taking place outside of the home.
Society and culture
In society, the nature of death and humanity's awareness of its own mortality has for millennia been a concern of the world's religious traditions and of philosophical inquiry. This includes belief in resurrection or an afterlife (associated with Abrahamic religions), reincarnation or rebirth (associated with Dharmic religions), or that consciousness permanently ceases to exist, known as eternal oblivion (associated with atheism).
Commemoration ceremonies after death may include various mourning, funeral practices and ceremonies of honouring the deceased. The physical remains of a person, commonly known as a corpse or body, are usually interred whole or cremated, though among the world's cultures there are a variety of other methods of mortuary disposal. In the English language, blessings directed towards a dead person include rest in peace, or its initialism RIP.
Death is the center of many traditions and organizations; customs relating to death are a feature of every culture around the world. Much of this revolves around the care of the dead, as well as the afterlife and the disposal of bodies upon the onset of death. The disposal of human corpses does, in general, begin with the last offices before significant time has passed, and ritualistic ceremonies often occur, most commonly interment or cremation. This is not a unified practice; in Tibet, for instance, the body is given a sky burial and left on a mountain top. Proper preparation for death and techniques and ceremonies for producing the ability to transfer one's spiritual attainments into another body (reincarnation) are subjects of detailed study in Tibet. Mummification or embalming is also prevalent in some cultures, to retard the rate of decay.
Capital punishment is also a culturally divisive aspect of death. In most jurisdictions where capital punishment is carried out today, the death penalty is reserved for premeditated murder, espionage, treason, or as part of military justice. In some countries, sexual crimes, such as adultery and sodomy, carry the death penalty, as do religious crimes such as apostasy, the formal renunciation of one's religion. In many retentionist countries, drug trafficking is also a capital offense. In China, human trafficking and serious cases of corruption are also punished by the death penalty. In militaries around the world courts-martial have imposed death sentences for offenses such as cowardice, desertion, insubordination, and mutiny.
Death in warfare and in suicide attack also have cultural links, and the ideas of dulce et decorum est pro patria mori, mutiny punishable by death, grieving relatives of dead soldiers and death notification are embedded in many cultures. Recently in the western world, with the increase in terrorism following the September 11 attacks, but also further back in time with suicide bombings, kamikaze missions in World War II and suicide missions in a host of other conflicts in history, death for a cause by way of suicide attack, and martyrdom have had significant cultural impacts.
Suicide in general, and particularly euthanasia, are also points of cultural debate. Both acts are understood very differently in different cultures. In Japan, for example, ending a life with honor by seppuku was considered a desirable death, whereas according to traditional Christian and Islamic cultures, suicide is viewed as a sin. Death is personified in many cultures, with such symbolic representations as the Grim Reaper, Azrael, the Hindu God Yama and Father Time.
In Brazil, a human death is counted officially when it is registered by existing family members at a cartório, a government-authorized registry. Before being able to file for an official death, the deceased must have been registered for an official birth at the cartório. Though a Public Registry Law guarantees all Brazilian citizens the right to register deaths, regardless of their financial means, of their family members (often children), the Brazilian government has not taken away the burden, the hidden costs and fees, of filing for a death. For many impoverished families, the indirect costs and burden of filing for a death lead to a more appealing, unofficial, local, cultural burial, which in turn raises the debate about inaccurate mortality rates.
Talking about death and witnessing it is a difficult issue with most cultures. Western societies may like to treat the dead with the utmost material respect, with an official embalmer and associated rites. Eastern societies (like India) may be more open to accepting it as a fait accompli, with a funeral procession of the dead body ending in an open air burning-to-ashes of the same.
Much interest and debate surround the question of what happens to one's consciousness as one's body dies. The belief in the permanent loss of consciousness after death is often called eternal oblivion. Belief that consciousness is preserved after physical death is described by the term afterlife.
After death the remains of an organism become part of the biogeochemical cycle. Animals may be consumed by a predator or a scavenger. Organic material may then be further decomposed by detritivores, organisms which recycle detritus, returning it to the environment for reuse in the food chain, where these chemicals may eventually end up being consumed and assimilated into the cells of a living organism. Examples of detritivores include earthworms, woodlice and dung beetles.
Microorganisms also play a vital role, raising the temperature of the decomposing matter as they break it down into yet simpler molecules. Not all materials need to be decomposed fully. Coal, a fossil fuel formed over vast tracts of time in swamp ecosystems, is one example.
Contemporary evolutionary theory sees death as an important part of the process of natural selection. It is considered that organisms less adapted to their environment are more likely to die having produced fewer offspring, thereby reducing their contribution to the gene pool. Their genes are thus eventually bred out of a population, leading at worst to extinction and, more positively, making the process possible, referred to as speciation. Frequency of reproduction plays an equally important role in determining species survival: an organism that dies young but leaves numerous offspring displays, according to Darwinian criteria, much greater fitness than a long-lived organism leaving only one.
Extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last individual of that species (although the capacity to breed and recover may have been lost before this point). Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where species presumed extinct abruptly "reappear" (typically in the fossil record) after a period of apparent absence. New species arise through the process of speciation, an aspect of evolution. New varieties of organisms arise and thrive when they are able to find and exploit an ecological niche – and species become extinct when they are no longer able to survive in changing conditions or against superior competition.
Evolution of aging and mortality
Inquiry into the evolution of aging aims to explain why so many living things and the vast majority of animals weaken and die with age (exceptions include Hydra and the already cited jellyfish Turritopsis dohrnii, which research shows to be biologically immortal). The evolutionary origin of senescence remains one of the fundamental puzzles of biology. Gerontology specializes in the science of human aging processes.
Organisms showing only asexual reproduction (e.g. bacteria, some protists, like the euglenoids and many amoebozoans) and unicellular organisms with sexual reproduction (colonial or not, like the volvocine algae Pandorina and Chlamydomonas) are "immortal" at some extent, dying only due to external hazards, like being eaten or meeting with a fatal accident. In multicellular organisms (and also in multinucleate ciliates), with a Weismannist development, that is, with a division of labor between mortal somatic (body) cells and "immortal" germ (reproductive) cells, death becomes an essential part of life, at least for the somatic line.
The Volvox algae are among the simplest organisms to exhibit that division of labor between two completely different cell types, and as a consequence include death of somatic line as a regular, genetically regulated part of its life history.
- Day of Judgement
- Day of the Dead
- Death anxiety (psychology)
- Death drive
- Death row
- Death trajectory
- Dying declaration
- End-of-life care
- Faked death
- Grim Reaper
- Last rites
- List of deaths by year
- Memento mori
- Near-death experience
- Origin-of-death myth
- Spiritual death
- Survivalism (life after death)
- Taboo on the dead
- Zimmerman, Leda (19 October 2010). "Must all organisms age and die?". Massachusetts Institute of Technology School of Engineering. Archived from the original on 1 November 2010. Retrieved 5 February 2012.
- "Death". Online Etymology Dictionary. Archived from the original on 13 October 2016. Retrieved 5 November 2013.
- "Turritopsis nutricula (Immortal jellyfish)". Jellyfishfacts.net. Archived from the original on 13 October 2016. Retrieved 18 January 2014.
- Aubrey D.N.J, de Grey (2007). "Life Span Extension Research and Public Debate: Societal Considerations" (PDF). Studies in Ethics, Law, and Technology. 1 (1, Article 5). doi:10.2202/1941-6008.1011. Archived from the original (PDF) on 13 October 2016. Retrieved 20 March 2009.
- Crippen, David. "Brain Failure and Brain Death". Scientific American Surgery, Critical Care, April 2005. Archived from the original on 24 June 2006. Retrieved 9 January 2007.
- Artishevsky, Alexander (2010). Life Death Whatever. Createspace. ISBN 978-1-4495-9420-6.[page needed]
- Samir Hossain Mohammad; Gilbert Peter (2010). "Concepts of Death: A key to our adjustment". Illness, Crisis and Loss. 18 (1).
- "Additional Lifespan Development Topics" (PDF). McGraw-Hill Companies. Retrieved 18 January 2014.
- Human Immortality; Death and Adjustment Hypotheses Elaborated. Book Review by Dr. Peter Fenwick Archived 18 May 2013 at the Wayback Machine.
- Facing the finality – Death and Adjustment Hypotheses Dr. Mohammad Samir Hossain, 2009
- Metcalf, Peter; Huntington, Richard (1991). Celebrations of Death: The Anthropology of Mortuary Ritual. New York: Cambridge Press.[page needed]
- Oxford English Dictionary[clarification needed]
- Miller, F.G. (October 2009). "Death and organ donation: back to the future". Journal of Medical Ethics. 35 (10): 616–620. PMID 19793942. doi:10.1136/jme.2009.030627.
- Bondeson 2001, p. 77
- Bondeson 2001, pp. 56, 71.
- Bondeson 2001, p. 239
- Limmer, Dan; O'Keefe, Michael F.; Bergeron, J. David; Grant, Harvey; Murray, Bob; Dickinson, Ed (21 December 2006). Brady Emergency Care AHA (10th Updated ed.). Prentice Hall. ISBN 978-0-13-159390-9.
- Merkle, Ralph. "Information-Theoretic Death". www.merkle.com.
A person is dead according to the information-theoretic criterion if the structures that encode memory and personality have been so disrupted that it is no longer possible in principle to recover them. If inference of the state of memory and personality are feasible in principle, and therefore restoration to an appropriate functional state is likewise feasible in principle, then the person is not dead.
- "Blood Swapping Reanimates Dead Dogs". Fox News. 28 June 2005. Archived from the original on 14 October 2016. Retrieved 18 January 2014.
- "WHO Report on the Global Tobacco Epidemic, 2008" (PDF). WHO. 2008. Retrieved 26 December 2013. Lay summary (8 February 2008).
- "Tuberculosis Fact sheet N°104 – Global and regional incidence". WHO. March 2006. Retrieved 6 October 2006.
- Chris Thomas, Global Health/Health Infectious Diseases and Nutrition (2 June 2009). "USAID's Malaria Programs". Usaid.gov. Archived from the original on 26 January 2004. Retrieved 19 September 2016.
- "Aids could kill 90 million Africans, says UN". The Guardian. London. 4 March 2005. Retrieved 23 May 2010.
- Terry Leonard (4 June 2006). "AIDS Toll May Reach 100 Million in Africa". Washington Post. Retrieved 26 December 2013.
- Jean Ziegler, L'Empire de la honte, Fayard, 2007 ISBN 978-2-253-12115-2 p.130.[clarification needed]
- Olshansky, S. Jay; Perry, Daniel; Miller, Richard A.; Butler, Robert N. (2006). "Longevity dividend: What should we be doing to prepare for the unprecedented aging of humanity?". The Scientist. 20: 28–36. Retrieved 31 March 2007.
- Selye, H. (1938). Experimental evidence supporting the conception of "adaptation energy", Am. J. Physiol. 123 (1938), 758--765.
- Goldstone B (1952). "The general practitioner and the general adaptation syndrome". South African medical journal. 26 (6): 106–109.
- Gorban A. N.; Tyukina T. A.; Smirnova E. V.; Pokidysheva L. I. (2016). "Evolution of adaptation mechanisms: adaptation energy, stress, and oscillating death". J. Theor. Biol. doi:10.1016/j.jtbi.2015.12.017.
- Steven Reinberg (September 20, 2012). "Suicide now kills more Americans than car crashes: study". Medical Express. Retrieved 15 October 2012.
- "The top 10 causes of death". WHO. 2012. Retrieved 12 December 2012.
- McKie, Robin (13 July 2002). "Cold facts about cryonics". The Oalobserver. Retrieved 1 December 2013.
Cryonics, which began in the Fifties, is the freezing - usually in liquid nitrogen - of human beings who have been legally declared dead. The aim of this process is to keep such individuals in a state of refrigerated limbo so that it may become possible in the future to resuscitate them, cure them of the condition that killed them, and then restore them to functioning life in an era when medical science has triumphed over the activities of the Banana Reaper.
- "What is Cryonics?". Alcor Foundation. Retrieved 2 December 2013.
Cryonics is an effort to save lives by using temperatures so cold that a person beyond help by today's medicine might be preserved for decades or centuries until a future medical technology can restore that person to full health.
- Whetstine L, Streat S, Darwin M, Crippen D (2005). "Pro/con ethics debate: When is dead really dead?". Critical Care. 9 (6): 538–42. PMC . PMID 16356234. doi:10.1186/cc3894.
- Ralph Merkle (1992). "The technical feasibility of cryonics". Medical Hypotheses. 39 (1): 6–16. PMID 1435395. doi:10.1016/0306-9877(92)90133-w.
- Ben Best (2008). "Scientific justification of cryonics practice". Rejuvenation Research. 11 (2): 493–503. PMID 18321197. doi:10.1089/rej.2008.0661.
- "Scientists Open Letter on Cryonics". Retrieved 19 March 2013.
- Lovgren, Stefan (18 March 2005). "Corpses Frozen for Future Rebirth by Arizona Company". National Geographic. Retrieved 15 March 2014.
Many cryobiologists, however, scoff at the idea...
- Best, Ben (14 October 2015). "Cryonics". Comparisons of Cryonics Organizations. LONGECITY.ORG. Retrieved 26 October 2015.
- "Living to 120 and Beyond: Americans' Views on Aging, Medical Advances and Radical Life Extension". Pew Research Center. Pew Research Center's Religion & Public Life Project. 6 August 2013. Archived from the original on 16 August 2013. Retrieved 19 September 2016.
- Nuland, Sherwin B. (1993). How We Die: Reflections on Life's Final Chapter. Turtleback Books. ISBN 9781417643523.
- Adler, Jerry (7 May 2007). "To Treat the Dead (The new science of resuscitation is changing the way doctors think about heart attacks—and death itself)". Newsweek. Archived from the original on 3 May 2007. Retrieved 3 May 2007.
- Ariès, Philippe (1974). Western attitudes toward death: from the Middle Ages to the present. Baltimore: Johns Hopkins University Press. pp. 87–89. ISBN 0-8018-1762-5.
- Nuland, Sherwin B. (1994). How we die: Reflections on life's final chapter. New York: A.A. Knopf. pp. 254–255. ISBN 0-679-41461-4.
- Ahmad, S.; O'Mahony, M.S. (December 2005). "Where older people die: a retrospective population-based study". QJM. 98 (12): 865–70. PMID 16299059. doi:10.1093/qjmed/hci138.
- Cassel CK, Demel B (September 2001). "Remembering death: public policy in the USA". J R Soc Med. 94 (9): 433–6. PMC . PMID 11535743.
- Ariès, P. "Invisible Death". The Wilson Quarterly: 105–115. JSTOR 40256048.
- Heath, Pamela Rae; Klimo, Jon (2010). Handbook to the Afterlife. North Atlantic Books. p. 18. ISBN 978-1-55643-869-1. Retrieved 12 April 2012.
- Mullin 1999[page needed]
- "Shot at Dawn, campaign for pardons for British and Commonwealth soldiers executed in World War I". Shot at Dawn Pardons Campaign. Archived from the original on 4 October 2006. Retrieved 20 July 2006.
- Nations, Marilyn K.; Amaral, Mara Lucia (September 1999). "Flesh, Blood, Souls, and Households: Cultural Validity in Mortality Inquiry". Medical Anthropology Quarterly. 5 (3): 204–220. doi:10.1525/maq.1991.5.3.02a00020.
- Diamond, Jared M. (1999). "Up to the Starting Line". Guns, Germs, and Steel: The Fates of Human Societies (illustrated, reprint ed.). W. W. Norton. pp. 43–44. ISBN 0-393-31755-2.
- Beukeboom, L. & Perrin, N. (2014). The Evolution of Sex Determination. Online Chapter 2: The diversity of sexual cycles, p. 12. Oxford University Press.
- Gilbert, S.F. (2003). Developmental biology (7th ed.). Sunderland, Mass: Sinauer Associates. pp. 34–35. ISBN 0-87893-258-5.
- Hallmann, A. (June 2011). "Evolution of reproductive development in the volvocine algae". Sexual Plant Reproduction. 24 (2): 97–112. PMC . PMID 21174128. doi:10.1007/s00497-010-0158-4.
- Bondeson, Jan (2001). Buried Alive: the Terrifying History of our Most Primal Fear. W. W. Norton & Company. ISBN 978-0-393-04906-0.[Publisher/year date verification needed]
- Mullin, Glenn H. (2008) . Living in the Face of Death: The Tibetan Tradition. Ithaca, New York: Snow Lion Publications. ISBN 978-1-55939-310-2.
- Best, Ben. "Causes of Death". BenBest.com. Retrieved 10 June 2016.
- Marques, Susana Moreira & Sanches, Julia (Translator) (13 October 2015). Now and At the Hour of Our Death. And Other Stories. ISBN 978-1908276629.
- Rosenberg, David Rosenberg (17 August 2014). "How One Photographer Overcame His Fear of Death by Photographing It (Walter Schels' Life Before Death)". Slate.
- Sachs, Jessica Snyder (2001). Corpse: Nature, Forensics, and the Struggle to Pinpoint Time of Death (270 pages). Perseus Publishing. ISBN 978-0-7382-0336-2.
- Schels, Walter (Photographer) & Lakotta, Beate (Interviewer). "Before and After Death". LensCulture.com. Archived from the original on 11 October 2014. Retrieved 19 September 2016. Interviews with people dying in hospices, and portraits of them before, and shortly after, death.
- "The Odds of dying from various injuries or accidents". National Safety Council. United States. 2001.
- U.S. Census & AntiqueBooks.net (Scanned by). "Causes of Death 1916". Archived from the original on 18 September 2004. Retrieved 19 September 2016. How the medical profession categorized causes of death
- Wald, George. "The Origin of Death". ElijahWald.com. A biologist explains life and death in different kinds of organisms, in relation to evolution.