When Dr. Zachary Sussman went to Physicians Premier ER in Austin for a COVID-19 antibody test, he assumed he would get a freebie because he was a doctor for the chain. Instead, the free-standing emergency room charged his insurance company an astonishing $10,984 for the visit — and got paid every penny, with no pushback.

The bill left him so dismayed he quit his job. And now, after ProPublica’s questions, the parent company of his insurer said the case is being investigated and could lead to repayment or a referral to law enforcement.

The case is the latest to show how providers have sometimes charged exorbitant prices for visits for simple and inexpensive COVID-19 tests. ProPublica recently reported how a $175 COVID-19 test resulted in charges of $2,479 at a different free-standing ER in Texas. In that situation, the health plan said the payment for the visit would be reduced and the facility said the family would not receive a bill. In Sussman’s case, the insurer paid it all. But those dollars come from people who pay insurance premiums, and health experts say high prices are a major reason why Americans pay so much for health care.


Sussman, a 44-year-old pathologist, was working under contract as a part-time medical director at four of Physicians Premier’s other locations. He said he made $4,000 a month to oversee the antibody tests, which can detect signs of a previous COVID-19 infection. It was a temporary position holding him over between hospital gigs in Austin and New Mexico, where he now lives and works.

In May, before visiting his family in Scottsdale, Arizona, Sussman wanted the test because he had recently had a headache, which can be a symptom of COVID-19. He decided to go to one of his own company’s locations because he was curious to see how the process played out from a patient’s point of view. He knew the materials for each antibody test only amounted to about $8, and it gets read on the spot — similar to an at-home pregnancy test.

He could even do the reading himself. So he assumed Physicians Premier would comp him and administer it on the house. But the staff went ahead and took down his insurance details, while promising him he would not be responsible for any portion of the bill. He had a short-term plan through Golden Rule Insurance Company, which is owned by UnitedHealthcare, the largest insurer in the country. (The insurance was not provided through his work.)

During the brief visit, Sussman said he chatted with the emergency room doctor, whom he didn’t know. He said there was no physical examination. “Never laid a hand on me,” he said. His vitals were checked and his blood was drawn. He tested negative. He said the whole encounter took about 30 minutes.

About a month later, Golden Rule sent Sussman his explanation of benefits for the physician portion of the bill. The charges came to $2,100. Sussman was surprised by the expense but he said he was familiar with the Physicians Premier high-dollar business model, in which the convenience of a free-standing ER with no wait comes at a cost.

“It may as well say Gucci on the outside,” he said of the facility. Physicians Premier says on its website that it bills private insurance plans, but that it is out-of-network with them, meaning it does not have agreed-upon prices. That often leads to higher charges, which then get negotiated down by the insurers, or result in medical bills getting passed on to patients.

Sussman felt more puzzled to see the insurance document say, “Payable at: 100%.” So apparently Golden Rule hadn’t fought for a better deal and had paid more than two grand for a quick, walk-in visit for a test. He was happy not to get hit with a bill, but it also didn’t feel right.

He said he let the issue slide until a few weeks later when a second explanation of benefits arrived from Golden Rule, for the Physicians Premier facility charges. This time, an entity listed as USA Emergency sought $8,884.16. Again, the insurer said, “Payable at: 100%.”

USA Emergency Centers says on its website that it licenses the Physicians Premier ER name for some of its locations.

Now Sussman said he felt spooked. He knew Physicians Premier provided top-notch care and testing on the medical side of things. But somehow his employer had charged his health plan $10,984.16 for a quick visit for a COVID-19 test. And even more troubling to Sussman: Golden Rule paid the whole thing.

Sussman was so shaken he resigned. “I have decided I can no longer ethically provide Medical directorship services to the company,” he wrote in his July 13 resignation email. “If not outright fraudulent, these charges are at least exorbitant and seek to take advantage of payers in the midst of the COVID19 pandemic.”

Sussman agreed to waive his patient privacy so officials from the company could speak to ProPublica. USA Emergency Centers declined interview requests and provided a statement, saying “the allegations are false,” though it did not say which ones.

The statement also said the company “takes all complaints seriously and will continue to work directly with patients to resolve issues pertaining to their emergency room care or bill. …The allegations received pertain to a former contracted employee, and we cannot provide details or further comment at this time.”

Physicians Premier advertises itself as a COVID-19 testing facility on its website, with “results in an hour.” According to the claims submitted by Physicians Premier to Golden Rule, obtained by Sussman, the physician fee and facility fees were coded as emergency room visits of moderate complexity. That would mean his visit included an expanded, problem-focused history and examination. But Sussman said the staff only took down a cursory medical history that took a few minutes related to his possible exposure to COVID-19. And he said no one examined him.

The claims also included codes for a nasal swab coronavirus test. But that test was not performed, Sussman said. The physician’s orders documented in the facility’s medical record also do not mention the nasal swab test. Those charges came to $4,989.

The claims show two charges totaling $1,600 for the antibody test Sussman received. In a spreadsheet available on its website on Friday, Physicians Premier lists a price of $75 for the antibody test.

For comparison, Medicare lists its payment at $42.13 for COVID-19 antibody tests. That’s because Medicare, the government’s insurance plan for the disabled and people over 65, sets prices.

Complicating matters, Texas is the nation’s epicenter for free-standing emergency rooms that are not connected to hospitals. Vivian Ho, an economist at Rice University who studies the facilities, said their business model is based on “trying to mislead the consumer.” They set up in locations where a high proportion of people have health insurance, but they don’t have contracted rates with the insurers, Ho said. They are designed to look like lower-priced urgent care centers or walk-in clinics, Ho said, but charge much higher emergency room rates. (The centers have defended their practices, saying that they clearly identify as emergency rooms and are equipped to handle serious emergencies, and that patients value the convenience.)

The day after he resigned, Sussman texted an acquaintance who works as a doctor at Physicians Premier. The acquaintance said the facility typically only collects a small percentage of what gets billed. “I just don’t want to be part of the game,” Sussman texted to him.

Shelley Safian, a Florida health care coding expert who has written four books on medical coding, reviewed Sussman’s medical records and claims at ProPublica’s request. The records do not document a case of a complex patient that would justify the bills used to code the patient visit, she said. For example, the chief complaint is listed as: “A generic problem (COVID TESTING).” Under “final acuity,” the medical record says, “less urgent.” Under the medical history it says, “NO SYMPTOMS.”

Safian described the charges as “obscene” and said she was shocked the insurer paid them in full. “This is the exact opposite of an employee discount,” she said. “Obviously nobody is minding the store.”

Congress opened the door to profiteering during the pandemic when it passed the CARES Act. The legislation, signed into law in March, says health insurers must pay for out-of-network testing at the cash price a facility posts on its website, or less. But there may be other charges associated with the tests, and insurers generally have tried to avoid making patients pay any portion of costs related to COVID-19 testing or treatment.

The charges for Sussman’s COVID-19 test visit are “ridiculous,” said Niall Brennan, president and CEO of the Health Care Cost Institute, a nonprofit organization that studies health care prices. Brennan wondered whether the CARES Act has made insurers feel legally obligated to cover COVID-19 costs. He called it “well intentioned” public policy that allows for “unscrupulous behavior” by some providers. “Insurance companies and patients are reliant on the good will and honesty of providers,” Brennan said. “But this whole pandemic, combined with the CARES Act provision, seems designed for unscrupulous medical providers to exploit.”

It’s illegal for medical providers to charge for services they did not provide. But ProPublica has previously reported how little insurers, including UnitedHealthcare, do to prevent fraud in their commercial health plans, even though experts estimate it consumes about 10% of all health care costs. For-profit insurance companies don’t want to spend the time and money it takes to hold fraudulent medical providers accountable, former fraud investigators have told ProPublica. Also, the insurance companies want to keep providers in their networks, so they easily cave.

In mid-July, Sussman used the messenger system on Golden Rule’s website to report his concerns about the case. Short-term health plans are typically less expensive because they offer less comprehensive coverage. Sussman said he appreciated that his plan covered the charges, and felt compelled to tell the company what had happened.

That led to a phone conversation with a fraud investigator. They went line by line through the charges and Sussman told him many of the services had not been provided. “His attitude was kind of passive,” Sussman said of the fraud investigator. “There was no indignation. He took in stride, like, ‘Yep, that’s what happens.’” The investigator said he would escalate the case and see if the facility had submitted any other suspect claims. But Sussman never heard back.

Maria Gordon-Shydlo, a spokeswoman for UnitedHealthcare, which owns Golden Rule, would not provide anyone to be interviewed. She said in an emailed statement that the company’s first priority during the pandemic “has been to ensure our members get the care they need and are not billed for COVID testing and treatment. Unfortunately, there are some providers who are trying to take advantage of this and are inappropriately or even fraudulently billing.”

“Golden Rule has put processes in place to address excessive COVID-related billing,” the statement said. “We are currently investigating this matter and, if appropriate, will seek to recoup any overpayment and potentially refer this case to law enforcement.”

Golden Rule’s 100% payment of the charges may simply come down to “incompetence,” said Dr. Eric Bricker, a Texas internist who spent years running a company that advised employers who self-fund their insurance. Insurance companies auto-adjudicate millions of claims on software that may be decades old, said Bricker, who produces videos to help consumers and employers understand health care. If bills are under a certain threshold, like $15,000, they may sail through and get paid without a second look, he said.

UnitedHealth Group reported net earnings of $6.6 billion in the second quarter of 2020. Bricker said the company may be paying bills without questioning them because it doesn’t “want to create any noise” by saying no at a time its own earnings are so high, Bricker said.

Texas has a consumer protection law that’s designed to prevent businesses from exploiting the public during a disaster. The attorney general’s office has received and processed 52 complaints about health care businesses and billing or price gouging related to the pandemic, a spokeswoman from the office said in an email. The agency does not comment on the existence of any investigations, but has not filed any cases related to overpriced COVID-19 tests.

Sussman said he got one voicemail from a billing person at Physicians Premier, saying she wanted to explain the charges, but he did not call back. He said he spoke out about it to ProPublica because he opposes Medicare-for-all health care reform proposals. Bad actors in the profession could cause doctors to lose their privilege to bill and be reimbursed independently, he said. Most physicians are fair with their billing, or even conservative, he said. “If instances like these go unchecked it will provide more ammo for advocates of a single-payer system.”

This article was first published on ProPublica. You can read it here.

  • Woman says her husband keeps ‘ruining’ romance novels by acting them out before she reads them
    Photo credit: CanvaA nightly seduction.
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    Woman says her husband keeps ‘ruining’ romance novels by acting them out before she reads them

    “I genuinely don’t deserve him and also he is ruining my books.”

    Sometimes people reveal the climactic scene in a great book we’re reading before we even get there. It may be annoying, but most of the time, the ruined moment happens by accident.

    One woman shared this challenge in her Reddit thread, My husband is spoiling the spicy scenes in my romance books by acting them out before I get to them. Is it all a weird coincidence, or is their real genius hidden behind one man’s romantic gesture?

    My husband is acting differently in the bedroom

    A woman writing under the Reddit tag u/Embarrassed-Friend-8 shared she loves romance novels. Enough to consume four to five a month. Recently, her husband of 11 years started acting differently in the bedroom with what she describes as “themed” nights. She explains, “I’ll think ‘okay, that was fun and a little random’ and move on.” But then the real unexpected twist occurs. She continues, “A few days later I’ll be reading my book, hit a spicy scene and actually have to put my Kindle down bc it’s the same scene. Like, the same vibe, the same moves, occasionally almost the same setup.”

    She thinks he might be reading ahead and playing a fun little prank. But then the story beneath the story begins to reveal itself.

    “I read on my Kindle. He’d have to get into my account, figure out where I am in each book, read ahead, and then coordinate. He’s a big tech/numbers guy, so if he’s doing this I guarantee there’s a spreadsheet involved somewhere.   I’m honestly not even mad. Genuinely if this is what’s happening it might be the most unhinged romantic gesture anyone has ever done for me. But he is technically spoiling the books??”

    husband, wife, reddit post, role-play, dinner date
    A sexy dinner date.
    Photo credit Canva

    People love a good role-play story

    As this story started to gain traction, the comments section filled up fast with amused, confused, and thoroughly invested people. It’s hard to resist a great story that begins with, “11 years and he’s still out here finding new ways to be surprising. I genuinely don’t deserve him and also he is ruining my books.” These are some of the Redditors’ thoughts:

    “Made the mistake of reading this post to my husband and I think I actually saw a light bulb turn on above his head — gonna start locking my Kindle…”

    “Book mark your favorite scenes…give him a selection so there’s still an element of surprise.”

    “You made me laugh so hard this morning!”

    “Yes, but ruining them in the BEST possible way!”

    “Absolute legend behavior, but you’re right, he needs to drop some DLC that isn’t in the source material for the real surprises.”

    “This is adorable and also sweet and romantic!”

    “I mean, the husband is looking at this as ‘ok, challenge accepted!’”

    “Girl, start reading some spicier stuff!”

    mystery, Kindle, spreadsheets, fun surprise
    A woman looks through a spyglass.
    Photo credit Canva

    The mystery is uncovered in a Reddit update

    In an update to the original post, the woman shared that she was very appreciative of the comments and support from readers of her posting. “Turns out you all were right. He had access to my shared Kindle library and got this idea for a prank, but once he did it a few times he really got ‘invested.’” She continues, “He’s going to stop spoiling my books but we did come up with another arrangement, also thanks to the comments here. I’m going to give him a list of pre-approved spicy scenes and he’ll choose (in no specific order) which he wants to surprise me with.”

    This husband was willing to go the extra mile to keep their relationship moving in a healthy direction. And yet, there was one more little update she had to add in, “YES there was a spreadsheet. Chili pepper emojis for spice levels. A column for notes (needs wine, links to Spotify playlists, etc). Color coding. Multiple tabs. More organization than even I was expecting. It will be ongoing and is now shared so I can drop in my own chili peppers and notes.”

    sunsets, sexy moments, healthy intimacy, romance readers
    A romantic couple as the sun sets.
    Photo credit Canva

    Romance novels are not just for the ladies

    Romance novels aren’t simply a niche. It’s one of the most widely read genres worldwide. It’s not just casual reading either. Romance readers are voraciously digesting an average of five novels per month. A 2021 study in Humanities & Social Sciences Communications found that most readers are in relationships and looking for little escape and relaxation. Writing that is exciting, easy, and fun to read matters more than the sexual content.

    What might be surprising is that romantic literature appeals to male readers more than you might think. In a 2025 survey conducted with fans of romance books by Talker Research, 63% of the men considered themselves die-hard fans. Also, men spend 364 hours annually reading romance compared to women, who spend 312 hours.

    couples, dates, relationships, passion, fun
    A couple eats watermelon together.
    Photo credit Canva

    A little bit of romance matters

    Research shows that doing something new together can reignite connection. A 2024 study in Science Direct found that passion and intimacy are directly related to overall relationship satisfaction. And it’s not the big swings at romance that matter most. It’s the small, attentive actions that bring more intimacy.

    A 2023 review in the National Library of Medicine found that in the psychology of a romantic relationship, responsiveness, emotional attunement, and mutual investment build a stronger, lasting connection.

    Romance might seem like something we’re all supposed to instinctively know how to do. This husband is willing to invest time and creativity into his marriage, even if his first attempts didn’t land perfectly. What she thought was a small frustration slowly turned into a stronger connection. All of this good started by simply trying and reading a little ahead.

  • It’s never too late to learn a language – adults and kids bring different strengths to the task
    Photo credit: Bulat Silvia/iStock/Getty Images PlusAdult language learners have an understanding of grammar that can help them learn a new language. But they are also likely to feel more self-conscious as they do so.

    There’s a common assumption that if someone starts learning a language when they are very young, they will quickly become fluent.

    Many people also assume that it will become much harder to learn a language if they start later in life.

    Research into language learning shows that how old someone is when they learn a language does matter, but there is no point at which the ability to learn a language switches off.

    While a young language learner can more easily acquire a native accent, adults retain the ability to learn new languages well into later life. Anyone can continue to learn and refine their vocabulary and grammar. Other factors, like motivation, can also play a role for learners of all ages.

    I am a linguist and the author of a forthcoming book, “Beyond Words: How We Learn, Use, and Lose Language,” which looks at how language is learned, used and lost across a lifespan — and why age alone does not set hard limits on our linguistic abilities.

    Instead, the strategies learners use, the outcomes they achieve most easily, and how others judge their progress can all change over time.

    How age shapes language learning

    Someone’s age can influence their language learning ability in a variety of ways.

    Scientists sometimes talk about sensitive periods, or an early development window in which the brain is especially receptive to certain kinds of input.

    When it comes to language, babies and children are particularly sensitive to the sound patterns of speech. They can also pick up on subtle phonetic distinctions that adults struggle to perceive or reproduce.

    This helps explain why children who grow up bilingual often sound native in both languages. Accents, more than vocabulary or grammar, are where age-related differences are most pronounced.

    Sensitive periods are found in other animals, too, especially birds, which have an early sensitive period for learning their species-specific song from an adult tutor.

    After this window closes, learning a new language is still very much possible. But it usually takes more conscious effort and practice.

    Studies also show that children exposed to a second language early, roughly before puberty, are more likely to develop nativelike pronunciation and intonation.

    Brain imaging research shows that people who learn two languages early in life tend to process both languages in the same parts of the brain. Those who learn a second language later often use slightly different brain areas for each language.

    In practical terms, early bilinguals are more likely to switch between languages effortlessly. Later learners may have to more consciously work through their second language, especially at first.

    Two boys sit next to each other at a desk in a classroom filled with other children at desks.
    Second grade students do classwork during a Spanish-only, dual immersion class in University Hill Elementary School in Boulder, Colo., in 2022. Glenn Asakawa/The Denver Post via Getty Images

    Benefits to learning a language as an adult

    Pronunciation is only one part of language proficiency. Adults bring their own strengths to the task.

    Unlike young children, adult learners already have a fully developed first language. They also have skills in reasoning and pattern recognition, as well as an awareness of how language works.

    This allows adults to learn in a more deliberate way, as they study grammar rules and consciously compare languages. Adults are also more likely to rely on deliberate strategies, such as memorization, to learn a language.

    In classroom settings, adults often outperform children in early stages of learning, particularly in reading and writing.

    Language learning never truly stops. Even in adulthood, people continue to develop and refine their first language, shaped by their education, work and social environment, and how they use it day to day.

    While it may be harder for adults to acquire a nativelike accent later in life, the good news is that grammar, vocabulary and fluency remain well within reach for most adult learners.

    Benefits of learning a language as a kid

    Children, meanwhile, tend to learn languages implicitly, through immersion and interaction, often without conscious attention to rules.

    Social and emotional factors also play a major role in successfully learning a language.

    Children are generally less self-conscious than adults and more willing to take risks when speaking.

    Adults, by contrast, are often acutely aware of mistakes and may hesitate to speak for fear of sounding foolish or being judged.

    Research consistently shows that being willing to communicate is a strong predictor of success in learning a new language. Anxiety, inhibition and negative feedback from others can significantly slow progress, regardless of age.

    Accent, bias and social pressure

    Other factors, like social pressure and discrimination, matter as someone tries to learn a new language.

    Research into language and identity shows that listeners frequently associate accented speech with lower intelligence or competence, despite there being no connection between accent and cognitive ability.

    Non-native speakers often experience stigmatization, discrimination and prejudice from native speakers.

    This bias can discourage adult learners and reinforce the false belief that successful language learning means sounding native.

    Motivation and aptitude matter, too

    Motivation is another key factor that affects learners of all ages.

    People learn new languages for many reasons: a new country, work, school, relationships or interest in another culture.

    Research distinguishes between the different reasons people learn a language. Some are practical, like advancing a career or passing a test. Others are personal, such as wanting to connect with a community, culture or family.

    Learners who feel a strong personal or emotional connection to the language are more likely to keep going even when it gets difficult, and they often reach higher levels of fluency than those without this connection.

    Other people have a natural aptitude for learning a language and can pick it up easily. Perhaps they quickly notice sound patterns, or they can remember new vocabulary after hearing it once or twice.

    Language aptitude is different from intelligence and varies from person to person. Aptitude makes success in learning a language more likely, but it doesn’t guarantee it.

    Learners with average aptitude can still become very proficient in new languages as adults if they have consistent exposure, practice and motivation.

    Different ages, different strengths

    So is it better to learn a second language as a child or as an adult? Research suggests the more useful question is which aspects of language learning, such as pronunciation, fluency or long-term mastery, matter most.

    Learning a new language early makes it easier to sound like a native speaker and to use the language smoothly, without having to think about the rules.

    Learning that language later in life draws on adult strengths, such as planning, problem-solving and focused practice.

    Ultimately, some people pick up languages quickly while others struggle, regardless of how old they are.

    Beliefs about language learning shape education policy, parenting choices and how multilingual speakers are treated in everyday life.

    When adults are told they’ve missed their chance to learn a language, many never bother to try. When foreign accents are treated as flaws, capable speakers can be unfairly discriminated against.

    In fact, research shows that learning a language is possible at any age – it’s a lifelong, achievable journey, rather than a race against the clock.

    This article originally appeared on The Conversation. You can read it here.

  • What does the appendix do? Biologists explain the complicated evolution of this inconvenient organ
    Photo credit: Sebastian Kaulitzki/Science Photo Library via Getty ImagesMost people get acquainted with their appendix when it’s inflamed and about to rupture.
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    What does the appendix do? Biologists explain the complicated evolution of this inconvenient organ

    It may be inconvenient, but the appendix is no evolutionary mistake.

    Most people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast.

    That basic story traces back at least to Charles Darwin, the English naturalist who developed the theory of natural selection. In “The Descent of Man,” he described the appendix as a vestige: a leftover from plant-eating ancestors with larger digestive organs. For more than a century, that interpretation shaped both textbook and casual medical wisdom.

    But the evolutionary story of the appendix turns out to be much more complicated.

    Along with our colleague Helene M. Hartman, a student preparing for a career in health care, we combined our expertise in behavioral ecologybiology and history to review the scientific literature on the appendix, expecting a simple answer.

    Instead, we found an organ that evolution kept reinventing, more interesting than most people imagine.

    How did the appendix evolve?

    The appendix is a small pouch branching off the first section of the large intestine. Its shape and structure vary widely across species – a clue that evolution may have tinkered with it more than once.

    Some species, including certain primates such as humans and great apes, have a long, cylindrical appendix. In others, including several marsupials such as wombats and koalas, the appendix appears shorter or more funnel-shaped. Still others, including some rodents and rabbits, have differently proportioned or branching structures. This structural diversity suggests that evolution has modified the organ under different ecological conditions.

    Diagram of a segment of the small intestine with fingers of the appendix oriented in various degrees
    The appendix can be oriented in the body in multiple ways. Mikael Häggström, M.D./Wikimedia Commons

    That suspicion is supported by evolutionary analyses. Comparative studies show that an appendix-like structure evolved independently in at least three distinct lineages of mammals – marsupials, primates and glires, a group that includes rodents and rabbits. A broader evolutionary survey found that the appendix evolved separately at least 32 times across 361 mammalian species.

    When a trait evolves repeatedly and independently, biologists call this convergent evolution. Convergence does not mean a structure is indispensable. But it does suggest that, under certain environmental conditions, having that structure provided a consistent enough advantage for evolution to favor it again and again.

    In other words, the appendix is unlikely to be a useless evolutionary accident.

    What does the appendix do?

    The appendix supports the immune system. It contains gut-associated lymphoid tissue – immune cells embedded in the intestinal wall that help monitor microbial activity in the gut. In early life, this tissue exposes developing immune cells to intestinal microbes, helping the body learn to distinguish between harmless symbionts and harmful pathogens.

    The appendix is particularly rich in structures called lymphoid follicles during childhood and adolescence, when the immune system is still maturing. These immune components participate in mucosal immunity, which helps regulate microbial populations along the intestinal lining and other mucosal surfaces. Lymphoid follicles produce antibodies, such as immunoglobulin A, to neutralize pathogens.

    Researchers have also proposed that the appendix acts as a microbial refuge. Some have suggested that biofilms – thin, structured communities of bacteria – line the appendix. During severe gastrointestinal infections that flush much of the gut microbiome from the colon, beneficial bacteria sheltered within these biofilms may survive and help repopulate the intestine afterward. Those beneficial microbes assist with digestioncompete with pathogens and interact with the immune system in ways that reduce inflammation and promote recovery.

    These hypotheses motivated a question our team explored: If the appendix helps preserve microbial stability, could removing it subtly affect reproductive fitness?

    Older clinical concerns suggested that appendicitis or appendectomy might impair fertility by causing inflammation and scarring – known as tubal adhesions – in the fallopian tubes. Such scarring could physically obstruct the egg’s passage to the uterus. But several large studies have since found no decrease in fertility after appendectomy – in some cases, researchers found a small increase in pregnancy rates.

    The appendix appears to have multiple functions, including immune and microbial ones. Affecting fertility, however, does not seem to be one of them.

    Evolutionary importance and modern life

    While the appendix has an interesting past, with evolution continually reinventing it, its modern importance is modest at best. Darwin underestimated the organ’s history, but his instinct wasn’t far off in the medical present: Some parts of human biology mattered more in the environments people evolved in than in the lives they lead today.

    Early humans lived in environments with little sanitation and strong social contact – perfect conditions for outbreaks of pathogens that cause diarrhea. An appendix that quickly restored the microbiome after infection could significantly improve survival. But over the past century, clean water, improved sanitation and antibiotics have sharply reduced deaths from diarrheal diseases in high-income countries.

    As a result, the evolutionary pressures that once favored the appendix have largely disappeared. Meanwhile, the medical risks of keeping the appendix – most notably appendicitis – remain. Modern surgery typically treats an infected appendix by removing it. A structure that was once a global evolutionary advantage is now more of a medical liability.

    This mismatch between past adaptations and present environments illustrates a core principle in evolutionary medicine: Evolution optimizes for survival and reproduction in ancestral environments, not for health, comfort or longevity in modern ones.

    Evolution operates at the level of populations over generations, favoring traits that increase average reproductive success, even if those traits sometimes harm individuals. Medicine works the other way around – helping individuals thrive in the present world rather than survive the past one.

    The appendix is not an IKEA spare part included “just in case,” but neither is it essential today. Human biology has many traits that were once beneficial, now marginal – and understanding them allows medicine to make better modern decisions.

    This article originally appeared on The Conversation. You can read it here.

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