CLOSE
iStock
iStock

8 Myths About Dead Bodies You Probably Think Are True

iStock
iStock

Bodies are weird enough, but it's the dead ones that hold real intrigue. The fact that most of us just don't spend that much time around them means it's hard to separate truth from fiction; corpses have been thought to be responsible for plagues, as well as to carry magic healing properties. Below, some dead body myths that won't give up the ghost—and explanations for the real-life science behind them.

1. HAIR AND NAILS GROW AFTER DEATH.

Corpse under sheet with hand sticking out

Not true! The cell division driving hair and nail growth stops when the body dies and the heart no longer pumps oxygen-filled blood throughout the circulatory system. It does look like things keep growing, though. When a dead body's skin loses hydration, it retracts—and retraction along the nail bed makes it appear as if the nails are getting longer. As for hair, drying skin on the face and head "pulls back towards the skull, making stubble appear more prominent," writes Claudia Hammond for the BBC. "Goosebumps caused by the contraction of the hair muscles can add to the effect."

2. DEAD BODIES ARE DANGEROUS.

There's no science to back up the idea that a dead and decomposing body is harmful to the living just by virtue of its being dead. This might sound obvious, but the belief that disease came from breathing in air infected by corpses was once common.

Miasmatic theory, as it was called, was a widespread belief among members of the medical profession (and the public) in the 19th century. Miasma, an ancient Greek word for "pollution," was the bad air coming from "rotting corpses, the exhalations of other people already infected, sewage, or even rotting vegetation" and was thought to be responsible for the spread of disease. Fortunately, this belief was eventually replaced by germ theory.

3. … AND MULTIPLE DEAD BODIES ARE EXTRA DANGEROUS.

In a publication from the Pan American Health Organization (a division of the World Health Organization), Donna Eberwine explains that the belief that dead bodies spread disease "remains a chronic problem in disaster relief efforts." After natural disasters, there is often a hysteria around dead bodies and a rush to immediately bury them, which distracts relief efforts from more pressing concerns. "The microorganisms that are involved in decomposition are not the kind that cause disease," Eberwine writes. "And most viruses and bacteria that do cause disease cannot survive more than a few hours in a dead body."

There are some exceptions. The level of Ebola virus in dead victims remains high, and their remains should only be handled by people in protective gear (and buried quickly). HIV can live for up to 16 days in a body held under refrigeration, and other blood-borne viruses like hepatitis, along with tuberculosis and gastrointestinal infections, can pose a risk. "The risk of contagion can be minimized with basic precautions and proper hygiene," Eberwine writes.

4. EMBALMING MAKES DEAD BODIES "SAFER."

Egyptian sarcophagus

"Embalming provides no public health benefit," according to the Funeral Consumer's Alliance (a nonprofit focused on affordable death care), citing the Centers for Disease Control and Canadian authorities. While individual morticians might say that a body must be embalmed before viewing, burial, or cremation, the process is generally not legally required. Moreover, since a dead body is usually not in itself harmful, embalming does not make it any safer. On the flip side, embalming chemicals are actually quite toxic, and embalmers must cover their entire body and wear a respirator while working. 

5. DEAD BODIES SIT UP ON THE MEDICAL TABLE.

This horror-movie trope just isn't real. During decomposition, a body might twitch or make small movements and noises due to the gas and waste released by bacteria. A decomposing corpse can definitely move a little, but sitting straight up is just not going to happen.

6. BURYING A BODY WITHOUT A COFFIN OR VAULT MEANS IT WILL CONTAMINATE THE GROUNDWATER.

Nope! Burials usually occur at 3.5 feet below the surface, whereas water can be 75 feet underground. "Mandatory setbacks from known water sources also ensure that surface water is not at risk," the Green Burial Council explains [PDF]. Additionally, because microorganisms living in the soil will break down the chemical compounds that remain in a dead body, we actually give out "more toxic chemicals during a day of living than a whole body will decomposing."

7. CREMAINS ARE "ASH."

Wall of cremation urns

Though we often talk of "scattering ashes," cremains are a little more complicated. Once a body intended for cremation has been burned in what's called a retort, what's left will be put in a cremulator. Sort of like a blender, the cremulator uses ball bearings or rotating blades to pulverize the bones and other remnants into a "grayish, coarse material, like fine gravel," as HowStuffWorks puts it.

8. ALL IN ALL, MAYBE DEATH ISN'T AS SCARY AS WE THINK.

According to psychological scientist Kurt Gray, it's possible that death isn't quite as terrifying as we think it is. Gray studied the responses of death row inmates and terminally ill patients as well as those of people asked to imagine they had untreatable cancer, and found that "while it's natural to fear death in the abstract, the closer one actually gets to it, the more positive he or she becomes," as New York Magazine explains. This may be due to something called the "psychological immune system," a term coined by Harvard psychologist Dan Gilbert in his book Stumbling on Happiness. According to Gray, our psychological immune system is engaged when bad things happen. "So when one is faced with death, all sorts of rationalization and meaning-making processes come in," he told New York Magazine. That may sound like your brain's trying to give you a cop-out, but it's much better than living in terror.

All photos courtesy of iStock.

nextArticle.image_alt|e
iStock
arrow
science
There May Be an Ancient Reason Why Your Dog Eats Poop
iStock
iStock

Dogs aren't known for their picky taste in food, but some pups go beyond the normal trash hunting and start rooting around in poop, whether it be their own or a friend's. Just why dogs exhibit this behavior is a scientific mystery. Only some dogs do it, and researchers aren't quite sure where the impulse comes from. But if your dog is a poop eater, it's nearly impossible to steer them away from their favorite feces.

A new study in the journal Veterinary Medicine and Science, spotted by The Washington Post, presents a new theory for what scientists call "canine conspecific coprophagy," or dogs eating dog poop.

In online surveys about domestic dogs' poop-eating habits completed by thousands of pet owners, the researchers found no link between eating poop and a dog's sex, house training, compulsive behavior, or the style of mothering they received as puppies. However, they did find one common link between the poop eaters. Most tended to eat only poop that was less than two days old. According to their data, 85 percent of poop-eaters only go for the fresh stuff.

That timeline is important because it tracks with the lifespan of parasites. And this led the researchers to the following hypothesis: that eating poop is a holdover behavior from domestic dogs' ancestors, who may have had a decent reason to tuck into their friends' poop.

Since their poop has a high chance of containing intestinal parasites, wolves poop far from their dens. But if a sick wolf doesn't quite make it out of the den in time, they might do their business too close to home. A healthier wolf might eat this poop, but the parasite eggs wouldn't have hatched within the first day or two of the feces being dropped. Thus, the healthy wolf would carry the risk of infection away from the den, depositing the eggs they had consumed away in their own, subsequent bowel movements at an appropriate distance before the eggs had the chance to hatch into larvae and transmit the parasite to the pack.

Domestic dogs may just be enacting this behavior instinctively—only for them, there isn't as much danger of them picking up a parasite at home. However, the theory isn't foolproof. The surveys also found that so-called "greedy eaters" were more likely to eat feces than dogs who aren't quite so intense about food. So yes, it could still be about a poop-loving palate.

But really, it's much more pleasant to think about the behavior as a parasite-protection measure than our best pals foraging for a delicious fecal snack. 

[h/t The Washington Post]

nextArticle.image_alt|e
iStock
arrow
science
The Prehistoric Bacteria That Helped Create Our Cells Billions of Years Ago
iStock
iStock

We owe the existence of our cells—the very building blocks of life—to a chance relationship between bacteria that occurred more than 2 billion years ago. Flash back to Bio 101, and you might remember that humans, plants, and animals have complex eukaryotic cells, with nucleus-bound DNA, instead of single-celled prokaryotic cells. These contain specialized organelles such as the mitochondria—the cell’s powerhouse—and the chloroplast, which converts sunlight into sugar in plants.

Mitochondria and chloroplasts both look and behave a lot like bacteria, and they also share similar genes. This isn’t a coincidence: Scientists believe these specialized cell subunits are descendants of free-living prehistoric bacteria that somehow merged together to form one. Over time, they became part of our basic biological units—and you can learn how by watching PBS Eons’s latest video below.

SECTIONS

arrow
LIVE SMARTER