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Field researchers have witnessed elephants staying with the dead — even if the deceased is not from the same family herd. This observation led the researchers to conclude the elephants had a "generalized response" to death.

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Dolphins too have been seen guarding deceased members of their species. And chimpanzees maintain social routines with the dead, such as grooming. No other species has been observed performing human-like memorial rituals, which requires abstract thought, but these events suggest animals possess a unique understanding of and response to death.

As Jason Goldman writes for BBC, "[F]or every facet of life that is unique to our species, there are hundreds that are shared with other animals. As important as it is to avoid projecting our own feelings onto animals, we also need to remember that we are, in an inescapable way, animals ourselves.

Anthropologist Donald Brown has studied human cultures and discovered hundreds of features shared by each and every one. Among them, every culture has its own way to honor and mourn the dead. But who was the first? Humans or another hominin in our ancestral lineage? That answer is difficult because it is shrouded in the fog of our prehistorical past. However, we do have a candidate: Homo naledi. Several fossils of this extinct hominin were discovered in a cave chamber at the Rising Star Cave system, Cradle of Humankind, South Africa.

To access the chamber required a vertical climb, a few tight fits, and much crawling. This led researchers to believe it unlikely so many individuals ended up there by accident. They also ruled out geological traps like cave-ins. Given the seemingly deliberate placement, some have concluded the chamber served as a Homo naledi graveyard.

Others aren't so sure, and more evidence is needed before we can definitively answer this question.

For most of us, the line between life and death is stark. We are alive; therefore, we are not dead. It's a notion many take for granted, and we should be thankful we can manage it so effortlessly. People afflicted with Cotard's syndrome don't see the divide so cleanly. This rare condition was first described by Dr. Jules Cotard in and describes people who believe they are dead, missing body parts, or have lost their soul.

Has Science Explained Life After Death? | HowStuffWorks

This nihilistic delusion manifests in a prevailing sense of hopelessness, neglect of health, and difficulty dealing with external reality. In one case , a year-old Filipino woman with Cotard's syndrome believed herself to smell like rotting fish and wished to be brought to the morgue so she could be with her kind. Thankfully, a regimen of antipsychotics and antidepressants improved her condition.

Others with this debilitating mental disorder have also been known to improve with proper treatment. The reason hair and fingernails don't grow after death is because new cells can't be produced. Glucose fuels cell division, and cells require oxygen to break down glucose into cellular energy.

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Death puts an end to the body's ability to intake either one. It also ends the intaking of water , leading to dehydration. As a corpse's skin desiccates, it pulls away from the fingernails making them look longer and retracts around the face giving a dead man's chin a five-o'clock shadow.

Anyone unlucky enough to exhume a corpse could easily mistake these changes as signs of growth. Interestingly, postmortem hair and fingernail growth provoked lore about vampires and other creatures of the night. When our ancestors dug up fresh corpses and found hair growth and blood spots around mouths the result of natural blood pooling , their minds naturally wandered to undeath. Not that becoming undead is anything we need to worry about today.

Unless, of course, you donate your brain to the Yale School of Medicine. People who live to be years old, called super-centenarians, are a rare breed. Those who live to be rarer still. The longest-living human on record was Jeanne Calment, a Frenchwoman who lived an astounding years. But why do we die in the first place? Setting spiritual and existential responses aside, the simple answer is that nature is done with us after a certain point. Success in life, evolutionarily speaking, is passing on one's genes to offspring. As such, most species die soon after their fecund days end.

Salmon die soon after making their upriver trek to fertilize their eggs.

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For them, reproduction is a one-way trip. Humans are a bit different. We invest heavily in our young, so we require a longer lifespan to continue parental care. But human lives outpace their fecundity by many years. This extended lifespan allows us to invest time, care, and resources in grandchildren who share our genes.

This is known as the grandmother effect. But if grandparents are so useful, why is cap set at some-odd years? Because our evolution did not invest in longevity beyond that. Nerve cells do not replicate, brains shrink, hearts weaken, and we die. If evolution needed us to hang around longer, maybe these kill switches would have been weeded out, but evolution as we know it requires death to promote adaptive life.

At this age, however, it is likely that our children may be entering their grandparent years themselves, and our genes will continue to be cared for in subsequent generations. While pressure to succeed is on the rise, students' mental health and readiness for college has diminshed. Big Think Edge For You. Big Think Edge For Business. Preview an Edge video. Sponsored by the Institute for Humane Studies Have you accidentally offended someone?

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Find out what's happening in the world as it unfolds. Owen Carey, who was celebrating his 18th birthday at the restaurant in , told waiting staff about his allergies before ordering a fried chicken burger coated in buttermilk at a London branch of the restaurant.

Neonatal death

Carey suffered an allergic reaction soon after eating it and died within an hour. The menu was reassuring in that it made no reference to any marinade or potential allergenic ingredient in the food selected," coroner Briony Ballard concluded in a written statement, read at Southwark Coroner's Court during an inquest on Friday. The food served to and consumed by the deceased contained dairy which caused the deceased to suffer a severe anaphylactic reaction from which he died," the statement added.

A Byron restaurant in London. Outside the court, Carey's family appealed for a change in the law to prevent similar incidents in the future. We are calling on the Government to change the law on allergen labelling in restaurants," his family said in a statement reported by PA.