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A Fossil Mystery, Solved by a Spin

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A Fossil Mystery, Solved by a Spin
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These fossilized “blobs” were a puzzle 310 million years old.

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Paleontologists decided that they were odd jellyfish named Essexella asherae. But the creature’s anatomy was unlike that of any living jellyfish.

Roy Plotnick, a paleontologist at the University of Illinois Chicago, turned an Essexella specimen upside down while doing research.

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Immediately, the seemingly amorphous blob’s true identity began to take shape.

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What scientists thought was a free-floating jellyfish instead revealed itself to be another ocean creature altogether.

Essexella fossils date back to the Carboniferous period, when northern parts of Illinois hovered just above the equator. A local river delta fed into the sea, creating a network of brackish wetlands home to sea scorpions, centipedes and early amphibians. Many of these creatures were buried by mudslides, which protected their remains from scavengers and decay. In the 19th century, coal miners began excavating an area, known as Mazon Creek, for fuel, and the fossils turned up in their spoil heaps.

Collectors have been finding the remains of these critters in the Mazon Creek fossil beds for more than a century. Most of the fossils are entombed in ironstone nodules. Cracking these concretions reveals the imprints of soft-bodied animals that resemble bulge-eyed aliens. In the 1950s, a local collector named Francis Tully discovered the imprint of a torpedo-shaped creature with a nozzlelike mouth. The taxonomic identity of the “Tully monster” has perplexed researchers ever since.

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Essexella was similarly perplexing. Nondescript fossils turned up by the thousands at Mazon Creek, and they were often sold at local flea markets, or even discarded.

Scientists published the first detailed scientific description of the blobs in 1979. Essexella fossils are composed of two structures — a textured, barrel-shaped region and a smooth bulb. Researchers posited that the textured area represented a skirtlike curtain that wrapped around jellyfish tentacles. The rounded region was the jellyfish bell.

But as time passed, this description struck many researchers as odd.

“We were really shoehorning it to fit the jellyfish model,” Dr. Plotnick said.

No living jellyfish have curtains around their tentacles. Such a curtain would make swimming and feeding cumbersome. The uniform shape of the blob fossils also perplexed Dr. Plotnick. “If it was a jellyfish that fell on the seafloor, it would just splatter out in all directions like an old string mop on the floor,” he said.

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Dr. Plotnick tested some other hypotheses to explain the blobs — such as gelatinous, barrel-shaped critters called salps or colonial congregations of tiny creatures known as siphonophores — but each new identity failed to explain Essexella’s anomalous anatomy.

In late 2016, Dr. Plotnick and a colleague, James Hagadorn, a geologist at the Denver Museum of Nature and Science, investigated the motherlode of blobs. They were at the Field Museum in Chicago, a repository for Mazon Creek fossils that has the world’s largest Essexella collection. Most had been donated by amateur collectors who were too intrigued to leave the fossils in the scrap heap.

The scientists sifted through drawer after drawer of the splotchy specimens. They lined up several fossils to photograph and compare side by side on a table. One of the blobs caught Dr. Plotnick’s eye. As he rotated the fossil upside down, he was struck by the clarity that the change of perspective offered.

“It looked like the bottom of an anemone,” Dr. Plotnick said. He added, “That was one of only a few times I’ve actually had the classic eureka moment.”

Artist’s impressions of the anatomy of Essexella as an anemone.

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Marjorie Leggitt

As Dr. Plotnick brushed up on sea anemone anatomy, the ambiguous blobs came into focus. “All the things that bothered us about this being a jellyfish now makes sense,” he said.

Instead of being a jellyfish’s bell, the rounded region of the Essexella was an anemone’s burrowing base. The textured barrel was not a tentacle-enclosing curtain but the body of the anemone. Some specimens are preserved so well that the scientists could see the muscles that the anemone used to bend and contract.

Dr. Plotnick, Dr. Hagadorn and their team redescribed Essexella as an ancient anemone last year in the journal Papers in Palaeontology. Because of their soft bodies, ancient anemone species are mostly known from only a handful of poorly preserved fossils. With thousands of relatively well-preserved Essexella specimens, this once puzzling species is now the best-known anemone in the fossil record. Dr. Plotnick posits that these animals once lined the floor of the Mazon Creek estuary.

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This isn’t the only time that paleontologists have flipped the scientific script to clarify the identity of a bizarre fossil. Reconstructing any ancient animal is tricky. After millions of years in the ground, fossils have been warped and weathered, crushed and scattered and stamped flat onto slabs of stone.

Sometimes, a fossil’s preservation alone is enough to disorient researchers. For decades, paleontologists were stumped by why armor-clad dinosaurs called Ankylosaurs were almost always fossilized upside down. In 2018, a team posited that the heavily armored animals often went belly up because of bloating as their carcasses floated out to sea.

And then there are the evolutionary oddballs that are difficult to decipher no matter the orientation of their fossils. In 1869, the paleontologist Edward Drinker Cope mistakenly placed the skull of an Elasmosaurus, a marine reptile, at the end of the creature’s tail instead of its elongated neck. Othniel Charles Marsh, another paleontologist, seized on Cope’s error, igniting a rivalry that would fester into the so-called Bone War.

Researchers couldn’t make heads or tails of Hallucigenia when it was found in rock.

The Natural History Museum / Alamy

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The head was the tail and the tail was the head on the wormy creature.

De Agostini via Getty Images

Even weirder was Hallucigenia. For decades, researchers could not make heads or tails of the creature, a worm covered in tentacles and stiltlike spines. Then they realized that its head was really its tail, and vice versa. “That was fun and not a mere detail,” said Jean-Bernard Caron, who is a paleontologist at the Royal Ontario Museum and a co-author of a study in 2015 that determined a bulb on one end of the Hallucigenia was the creature’s head. Better-preserved fossils of a related animal in China also revealed that Hallucigenia, like Essexella, was originally reconstructed upside down.

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“Clearly Hallucigenia has seen many flips,” Dr. Caron said.

While Dr. Caron’s work helped straighten out Hallucigenia, a recent paper upends his 2012 description of Pikaia, an enigmatic wormlike creature from the Burgess Shale in Canada that was purported to be an early forerunner to vertebrates. The new study suggests that a mysterious tubelike organ that researchers thought ran along Pikaia’s back (and may have been an early nerve cord) is actually the animal’s gut cavity, running along its belly.

“The animal is now on its head!” Dr. Caron said. Yet another fossilized creature got a new story when it turned over.

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The loss of healthcare subsidies force Californians to pay more or go without

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The loss of healthcare subsidies force Californians to pay more or go without

For Mikayla Tencer, being self-employed already meant juggling higher taxes, irregular income and the constant pressure of finding her own health insurance. This year, it also meant rethinking how often she could afford to see a doctor.

The 29-year-old content creator in San Francisco paid $168 a month last year for a Blue Shield health plan through Covered California. This year — without enhanced federal subsidies that expired at the end of December — that same plan would have cost $299 a month, with higher copays.

“People assume that because I’m young, I can just pick the cheapest plan and not worry about it,” Tencer said. “But I do need regular care, especially for mental health.”

Tencer is among tens of thousands of middle-class Californians facing steep increases in health insurance costs after Congress allowed enhanced federal subsidies for Affordable Care Act plans to expire Dec. 31.

Those extra subsidies were enacted in 2021 as part of temporary, pandemic-era relief, boosting financial help for people buying coverage on state-run insurance marketplaces such as Covered California. The law also expanded eligibility to people earning more than 400% of the federal poverty level, about $62,600 for a single person and $128,600 for a family of four.

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Mikayla Tencer records a TikTok video featuring eyeliners. Her blog showcases Bay Area attractions and local businesses.

(Paul Kuroda/For The Times)

With the expiration of the enhanced subsidies, people above that income threshold no longer receive federal assistance, and many who still qualify are seeing sharply higher premiums and out-of-pocket costs. On top of the loss of the extra federal benefits, the average Covered California premium this year rose by 10.3% because of fast-rising medical costs.

Jessica Altman, executive director of Covered California, said that about 160,000 Californians lost their subsidies when the enhanced federal assistance expired because their incomes were higher than 400% of the federal poverty level.

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To lower her monthly bill, Tencer switched to the cheapest Covered California option, bringing her premium down to about $161 a month. But the savings came with new costs. Primary care and mental health visits now carry $60 copays, up from $35.

When she showed up for a psychiatric appointment to manage her ADHD and generalized anxiety disorder, she said, she learned her doctor was out of network.

“That visit would have been $35 before,” she said. “Now it’s $180 out of pocket.”

Because of the higher costs, Tencer said she has cut therapy from weekly to biweekly sessions.

“The subsidies made it possible for me to be self-employed in the first place,” Tencer said. “Without them, I’m seriously thinking about applying for full-time jobs, even though the market is terrible.”

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For another self-employed Californian, the increase was even more dramatic.

Krista, a 42-year-old photographer and videographer in Santa Cruz County, relies on costly monthly intravenous treatments for a rare blood disorder. She asked that her full name not be used but shared her insurance and medical documents with The Times.

Last year, she paid about $285 a month for a Covered California plan. In late December, she received a notice showing her premium would rise to more than $1,200 a month. The rise was due to her loss of federal subsidies, as well as a 23% increase in the premium charged by Blue Shield.

“It terrified me. I thought, how am I ever going to retire?” she asked. “What’s the point?”

Krista ultimately enrolled in a plan costing about $522 a month, still nearly double what she had been paying, with a $5,000 deductible. She said she cannot downgrade to a cheaper plan because her clinic bills her treatment to insurance at roughly $30,000 a month, according to medical statements.

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To cut costs and preserve the ability to save for retirement and eventually afford a place of her own, Krista decided to move into an RV on private land. The decision came the same week she received notices showing a rent increase and a steep jump in her health insurance premiums.

Mikayla Tencer, a marketing influencer, with her elder dog, "Lucky" at Alamo Square Park.

Mikayla Tencer, a marketing influencer, with her elder dog, “Lucky” at Alamo Square Park.

(Paul Kuroda/For The Times)

Krista said she had been planning for more than a year to find a long-term living situation that would enable her to live independently, rather than continue paying more for an apartment.

“Nobody asks to be sick,” Krista said. “No one should have their life ruined because they get diagnosed with a disease or break a leg.”

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Although overall enrollment in Covered California this year has held steady, Altman said, she worries that more people will drop coverage as bills with the higher premiums arrive in the mail.

Those fears are already playing out.

Jayme Wernicke, a 34-year-old receptionist and single mother in Chico who earns about $49,000 a year, said she was transferred from Medi-Cal to a Covered California Anthem Blue Cross plan at the end of 2023. Her premium rose from about $30 a month to $60, then jumped to roughly $230 after the subsidies expired.

“For them to raise my health insurance almost 400% is just insane to me,” Wernicke said.

Her employer, a small family-owned business, does not offer health insurance. Her plan does not include dental or vision care and, she said, barely covers medical costs.

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“At a certain point, it just feels completely counterintuitive,” she said. “Either way, I’m losing.”

Wernicke dropped her own coverage and plans to pay for care with cash, calculating that the state tax penalty is less than the cost of premiums. Her daughter remains insured.

Two other Californian residents told The Times that they also decided to go without coverage because they could no longer afford it. They declined to provide their full names, citing concerns about financial and professional consequences.

Under California law, residents without coverage face an annual penalty of at least $900 per adult and $450 per child.

One, a 29-year-old self-employed publicist in Los Angeles requires medication for epilepsy. Last year, she paid about $535 a month for a silver plan through Covered California. This year, the same plan would have cost $823.

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After earning about $55,000 last year, she calculated that paying for care out of pocket would cost far less. Her epilepsy medication costs about $175 every three months without insurance, and her annual doctor visits total roughly $250.

“All of that combined is still far less than paying hundreds of dollars every month,” she said.

Another, April, a 58-year-old small-business owner in San Francisco, canceled her insurance in December after her quoted premium rose to $1,151 a month for a bronze plan and $1,723 for a silver plan, just for herself. Last year, April said she paid $566 for both her and her daughter. This year, her daughter’s premium alone jumped from $155 to $424.

The bronze plan also carried a $3,500 deductible for lab work and specialist visits, meaning she would have had to pay thousands of dollars out of pocket before coverage kicked in, on top of the higher monthly premium.

“The subsidies were absolutely what allowed me to sustain my business,” April said. “They were helping me sustain my financial world and have affordable care.”

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She rushed to complete medical tests before dropping coverage and hopes to go a year uninsured.

“The scariest part is not having catastrophic coverage,” she said. “If something happens, it can be millions of dollars.”

Tencer, the content creator in San Francisco, believes that in order to make the nation healthier, affordable healthcare should be universal.

“Our government should be providing it.” she said. “People can’t go to the doctor for routine checkups, they can’t get things checked out early, and they can’t access the resources they need.”

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Video: Rare Giant Phantom Jelly Spotted in Deep Waters Near Argentina

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Video: Rare Giant Phantom Jelly Spotted in Deep Waters Near Argentina

new video loaded: Rare Giant Phantom Jelly Spotted in Deep Waters Near Argentina

Scientists had a rare encounter with a giant phantom jelly during a dive off of Argentina in the Atlantic Ocean.

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Tuberculosis outbreak reported at Catholic high school in Bay Area. Cases statewide are climbing

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Tuberculosis outbreak reported at Catholic high school in Bay Area. Cases statewide are climbing

Public health officials in Northern California are investigating a tuberculosis outbreak, identifying more than 50 cases at a private Catholic high school and ordering those who are infected to stay home. The outbreak comes as tuberculosis cases have been on the rise statewide since 2023.

The San Francisco Department of Public Health issued a health advisory last week after identifying three active cases and 50 latent cases of tuberculosis at Archbishop Riordan High School in San Francisco. The disease attacks the lungs and remains in the body for years before becoming potentially deadly.

A person with active TB can develop symptoms and is infectious; a person with a latent tuberculosis infection cannot spread the bacteria to others and doesn’t feel sick. However, a person with a latent TB infection is at risk of developing the disease anytime.

The three cases of active TB have been diagnosed at the school since November, according to public health officials. The additional cases of latent TB have been identified in people within the school community.

Archbishop Riordan High School, which recently transitioned from 70 years of exclusively admitting male students to becoming co-ed in 2020, did not immediately respond to the The Times’ request for comment.

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School officials told NBC Bay Area news that in-person classes had been canceled and would resume Feb. 9, with hybrid learning in place until Feb. 20. Students who test negative for tuberculosis will be allowed to return to campus even after hybrid learning commences.

Officials with the San Francisco Department of Public Health said the risk to the general population was low. Health officials are currently focused on the high school community.

How serious is a TB diagnosis?

Active TB disease is treatable and curable with appropriate antibiotics if it is identified promptly; some cases require hospitalization. But the percentage of people who have died from the disease is increasing significantly, officials said.

In 2010, 8.4% of Californians with TB died, according to the California Department of Public Health. In 2022, 14% of people in the state with TB died, the highest rate since 1995. Of those who died, 22% died before receiving TB treatment.

The Centers for Disease Control and Prevention estimated that up to 13 million people nationwide live with latent TB.

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How does California’s TB rate compare to the country?

Public health officials reported that California’s annual TB incidence rate was 5.4 cases per 100,000 people last year, nearly double the national incidence rate of 3.0 per 100,000 in 2023.

In 2024, 2,109 California residents were reported to have TB compared to 2,114 in 2023 — the latter was about the same as the total number of cases reported in 2019, according to the state Department of Public Health.

The number of TB cases in the state has remained consistent from 2,000 to 2,200 cases since 2012, except during the COVID-19 pandemic from 2020 to 2022.

California’s high TB rates could be caused by a large portion of the population traveling to areas where TB is endemic, said Dr. Shruti Gohil, associate medical director for UCI Health Epidemiology and Infection Prevention.

Nationally, the rates of TB cases have increased in the years following the COVID-19 pandemic, which “was in some ways anticipated,” said Gohil. The increasing number of TB cases nationwide could be due to a disruption in routine care during the pandemic and a boom in travel post-pandemic.

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Routine screening is vital in catching latent TB, which can lie dormant in the body for decades. If the illness is identified, treatment could stop it from becoming active. This type of routine screening wasn’t accessible during the pandemic, when healthcare was limited to emergency or essential visits only, Gohil said.

When pandemic restrictions on travel were lifted, people started to travel again and visit areas where TB is endemic, including Asia, Europe and South America, she said.

To address the uptick in cases and suppress spread, Gov. Gavin Newsom signed Assembly Bill 2132 into law in 2024, which requires adult patients receiving primary care services to be offered tuberculosis screening if risk factors are identified. The law went into effect in 2025.

What is TB?

In the United States, tuberculosis is caused by a germ called Mycobacterium tuberculosis, which primarily affects the lungs and can impact other parts of the body such as the brain, kidneys and spine, according to the Centers for Disease Control and Prevention. If not treated properly, TB can be fatal.

TB is spread through the air when an infected person speaks, coughs or sings and a nearby person breathes in the germs.

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When a person breathes in the TB germs, they settle in the lungs and can spread through the blood to other parts of the body.

The symptoms of active TB include:

  • A cough that lasts three weeks or longer
  • Chest pain
  • Coughing up blood or phlegm
  • Weakness or fatigue
  • Weight loss
  • Loss of appetite
  • Chills
  • Fever
  • Night sweats

Generally, who is at risk of contracting TB?

Those at higher risk of contracting TB are people who have traveled outside the United States to places where TB rates are high including Asia, the Middle East, Africa, Eastern Europe and Latin America.

A person has an increased risk of getting TB if they live or work in such locations as hospitals, homeless shelters, correctional facilities and nursing homes, according to the CDC.

People with weakened immune systems caused by health conditions that include HIV infection, diabetes, silicosis and severe kidney disease have a higher risk of getting TB.

Others at higher risk of contracting the disease include babies and young children.

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