SCROLL NEWS / DISCOVERY
Search headlines
Find the stories shaping the conversation.
Results for " Cali " 5,311 found 🔀 AI-powered Shuffle
Big tech spends more than ever to shape California politics
Tech giants involved in AI and cryptocurrency spent $39 million last year to influence lawmakers and policy. It’s the start of what could be a spending blitz in the upcoming election.
CNA nurses demand UCI Health-Fountain Valley reopen pediatric units that serve hundreds of children annually
Registered nurses at UCI Health-Fountain Valley in Fountain Valley, Calif., are demanding that management immediately reopen the pediatric department and pediatric intensive care unit (PICU), which were closed without warning on Monday, March 23.
California’s good government dream has a nightmare flaw for state Democrats
Voters in the biggest blue state could theoretically be choosing between two Republican candidates for governor in in November — a wacky but not impossible outcome of the state’s nonpartisan primary system.
50 Years of Environmental Data Can Predict Health and Strandings of Sea Lions Pups in California
For more than 50 years, NOAA Fisheries has conducted vital research on seal and sea lion populations at a remote research station on San Miguel Island, California. The long-term data set provides clues to help us understand what environmental conditions lead to malnourished California sea lion pups and increased stranding levels. This information is important for managing their populations and helping rehabilitation centers prepare for periods when sea lion pup strandings may be elevated.
Tech giants are spending more than ever to shape California politics. See how much
Tech giants involved in AI and cryptocurrency spent $39 million last year to influence lawmakers and policy. It's the start of what could be a spending blitz in the upcoming election.
Prep talk: Troy Randall of Corona Santiago is becoming a baseball standout
The junior third baseman and pitcher has made major improvement.
Column: The TSA is too important to be turned into a political pawn
Agents' pay should be reinstated, and also significantly higher to reflect their role in keeping the nation safe.
'Kim's Convenience' review: Back onstage with sitcom warmth intact
Ins Choi's 'Kim Convenience,' the Toronto hit play that inspired a TV show, opens at the Ahmanson Theatre, refreshes a familiar immigrant family drama with warmth and gentle humor.
Apple, Ikea, Labubu: Why Culver City is a growing hot spot for business
Culver City has emerged as a magnet for companies and consumers.
Arkansas falls apart late in Sweet 16 loss to Arizona with ejection, bad fouls and a John Calipari technical
The Razorbacks unraveled fast on Thursday night in San Jose.
Judge rejects Green Party candidate’s bid to appear on California governor ballots
California Green Party candidate Butch Ware failed to submit correct tax returns in time to appear on the June ballot for governor, a judge ruled Thursday.
Scientists stunned as Mars dust storms blast water into space
Mars may look like a frozen desert today, but new evidence suggests its watery past didn’t simply fade away quietly—it may have been blasted into space by powerful dust storms. Scientists have discovered that even relatively small, localized storms can hurl water vapor high into the atmosphere, where it breaks apart and escapes.
Can pesticide exposure before pregnancy affect babies’ health?
A new study suggests a correlation between certain chemical compounds and lower newborn health scores.
Ryan Gosling to star in 'Everything Everywhere All at Once' directors' film
Ryan Gosling will star in a new movie from 'Everything Everywhere All at Once' directors Daniel Kwan and Daniel Scheinert.
Trump says he wants to send federalized troops to L.A., San Francisco
Trump called on the mayors and governors of several blue cities and states to allow troops to 'come in and stop the crime,' and specifically called out Los Angeles and San Francisco.
Oscars to leave Hollywood's Dolby Theatre in 2029
In addition to the physical relocation, the Oscars will shift to YouTube, a major reset as the show looks to expand its reach after years of declining TV audiences.
upus Unveiled: Bridging the Gap Between Science, Policy, and Patient Advocacy
Official website of Senator Akilah Weber Pierson, M.D., representing California Senate District 39.
Exclusive: Kamala Harris to appear at Democratic events through the South in April
As speculation continues about what Kamala Harris will do next, she has at least the first part of an answer: a swing through four Southern state Democratic Party events in April.
Reality TV is now a cultural powerhouse. There's no stopping it
The television genre is showing no signs of loosening its grip on viewers, who have helped propel series into sprawling universes.
From Trump to Dr. Oz: 10 reality TV personalities who went into politics
These reality stars either began their careers on TV or dipped into it later, but they all also tried their hand at politics — some more successfully than others.
Ron Conway is worried that California's proposed wealth tax could pass
"Our job is to get Gavin to negotiate this so that it doesn't get to the ballot," Tech investor Ron Conway said.
Costly auto mandate amounts to needless overkill
HB26-1199 is currently in the legislature, and let me explain how this affects you. Currently in the state of Colorado, your vehicle’s emissions have to meet California standards even though you do not live in California. Though we all can agree we want clean air for all of us, meeting the California specifications further harms you, the […]
All-League Greyhounds in winter sports named | Healdsburg Tribune | Local News Healdsburg, California
“What’s impactful about these selections is that they are decided on by all of the peer head coaches in the girls league. Each girl is talked about; some advocated for stat by stat, others in a speech-like cadence. These girls selected are getting head nods from all these other coaches. It’s a special recognition.”
Capital & Main Wins Five Best in Business Awards from SABEW
An investigation into California’s failure to protect underage farmworkers was among the five entries that won awards from the Society for Advancing Business Editing and Writing.
Howard Stern says 'George' magazine cover with JFK Jr. was his worst
Howard Stern is dishing on being JFK Jr.'s cover model for 'George' magazine and his friendship with Carolyn Bessette Kennedy.
Concern over Health Care Affordability Is Widespread
A majority of Californians are pessimistic about their future health care costs. These worries are fueling broad opposition to federal health care rollbacks.
Iran dismisses Trump's peace plan as 'deceptive,' as U.S. deploys more troops to Mideast
The Trump administration reportedly presented a 15-point peace deal to Iranian leaders. Iran rejected the proposal, according to its state media.
Meta and YouTube found liable in social media addiction trial
A California jury has found Meta and YouTube liable on all counts in a landmark case that accused the tech giants of intentionally addicting a young woman and injuring her
The politics of California’s surging gas prices
Gas prices continue to spike amid oil market disruptions caused by the war in Iran — and both Republicans and Democrats are working to capitalize on the issue.
Glyphosate: A story of science, risk, and nuance
In the summer of 2014, a California groundskeeper named Dewayne Johnson started noticing patches of raw, weeping skin spreading across his body. He had spent years applying Roundup, Monsanto’s glyphosate-based herbicide, for a school district, sometimes drenched in it when equipment malfunctioned. By 2014, he had a diagnosis: non-Hodgkin’s lymphoma. In 2018, a jury awarded him $289 million in damages, later reduced on appeal. Tens of thousands of lawsuits followed. The story hasn’t quieted down. It’s all over the internet, swinging between “this will kill you, buy organic” and “relax, you’re fear-mongering.” Some of that recent chatter stems from an Executive Order protecting glyphosate and its production, which set off intense infighting within the MAHA movement. Some of it reflects a deeper truth: Americans genuinely care about harmful chemicals in their environment (see poll below). And the conversation isn’t going anywhere, with a Supreme Court case involving Monsanto set for this April. Glyphosate (the active ingredient in Roundup) is one of the most widely used herbicides in the world. But does glyphosate cause cancer? And how much exposure is actually risky? With so much mistrust in institutions and corporations (and some genuine conflicts of interest), making sense of the actual scientific evidence is genuinely hard. Here is a translation of what the scientific evidence actually says. Does glyphosate cause harm? Glyphosate is an herbicide that kills most plants it contacts rather than targeting specific species. It works by blocking an enzyme pathway (EPSPS) that plants and many microorganisms need to produce essential amino acids. Without those amino acids, the plant can’t grow and dies. Glyphosate was first developed by Monsanto in the 1970s and became ubiquitous after the company introduced “Roundup Ready” crops in the 1990s. In 2024, Bayer removed glyphosate from residential Roundup-branded products due to litigation pressure. But today it is still the most widely used herbicide in the world. Farmers also discovered they could spray it directly on crops like oats, lentils, beans, and peas just before harvest to dry them out faster and make harvesting easier. Because of its widespread use, it’s obviously really important to understand if it’s harmful to humans. The key principle: The dose makes the poison The most important concept in toxicology is that “the dose makes the poison.” Sixteenth-century physician Paracelsus articulated what remains the foundational principle of toxicology: sola dosis facit venenum. Water will kill you if you drink enough of it. Aspirin saves lives at 81 milligrams and causes internal bleeding at higher chronic doses. So, at what dose is glyphosate poisonous? The LD50 in rats (the dose that kills half the test animals) is around 5,600 mg/kg body weight. Table salt is roughly 3,000 mg/kg. By that classic measure, glyphosate is less acutely toxic than salt. But some people are exposed to a lot of glyphosate through their work. And among the general public, there are many questions about low-dose, cumulative exposure from multiple sources over long periods. Does glyphosate cause health problems? Cancer Correlation maps are striking, with one analysis finding that 60% of counties that spray the most glyphosate have non-Hodgkin’s lymphoma rates above the national average. But correlation alone doesn’t establish cause, which is why animal and human studies matter. In animals: Rat studies are typically what most fear is rooted in, but most people don’t know the study details on the dosage given to rats. A pooled analysis of the 13 most rigorous rat studies found evidence that very high doses, around 55,000 times greater than typical food residue exposure, can cause certain cancers. In humans: One of the strongest studies followed 55,000 herbicide users over 20 years and found no overall increased cancer risk. There was one signal: among those with the highest use, rates of acute myeloid leukemia (AML) appeared elevated. A broader meta-analysis of 18 human studies also found no overall cancer risk, though a separate meta-analysis focused specifically on non-Hodgkin lymphoma found that people with high cumulative glyphosate exposure faced a 41% higher relative risk compared to those with low or no exposure. These human studies are observational studies (randomized controlled trials would be unethical), and meta-analyses are only as reliable as the studies they pool. But the story seems consistent: at very high exposure levels, there may be some cancer risk. But that’s about as far as the science currently takes us. Emerging research: gut and reproductive health Gut: Because glyphosate targets a pathway that exists in some gut bacteria, scientists have questioned whether it could affect the microbiome. In mice, a 2023 University of Iowa study found that glyphosate altered gut bacterial composition and raised markers of intestinal inflammation. A 2024 systematic review found similar patterns: disrupted gut bacteria and problems with the mucus layer that protects the intestinal wall in mice. Whether this translates to humans is an open question. The human gut is highly variable and resistant, and we don't yet have strong studies confirming the same effects in people. Reproductive health: Animal studies have found that glyphosate-based herbicides can interfere with reproductive hormones, including disrupting egg cell development in mice and reducing the number of eggs available in sheep’s ovaries. However, the doses used in these experiments were high, so it’s not yet clear whether the same effects would occur in humans. On the human side, a 2021 pilot study led by Mount Sinai researchers tested urine samples from pregnant women across the U.S. and found glyphosate in 95% of them. The study also found a possible connection between higher glyphosate exposure during pregnancy and a subtle physical difference measured in female newborns. That said, some connections weren’t statistically reliable and this was a small study. The researchers themselves said more and larger studies are needed before drawing firm conclusions. What do regulators say about glyphosate safety? In 2015, the International Agency for Research on Cancer (IARC), part of the World Health Organization, classified glyphosate as "probably carcinogenic to humans" (Group 2A). The classification is worth taking seriously. But, there’s an important distinction: IARC classifies hazard, meaning the potential to cause harm under some conditions. It does not assess risk, which accounts for actual exposure levels and the real-world probability of harm. The U.S. EPA, the European Food Safety Authority, Health Canada, and regulatory agencies in Australia and Japan have all concluded that glyphosate is “unlikely to be carcinogenic to humans” at realistic exposure levels. They’re asking a different question: given how much of this people actually encounter, what is the probability of harm? Your actual exposure is what determines your actual risk. What does glyphosate mean for your daily life? At the grocery store: Food residues are small. The EPA’s acceptable daily intake is 1.75 mg/kg of body weight per day. To hit that threshold from oatmeal alone, a 150-pound adult would need to eat roughly 50 pounds of oats every day. But this calculation addresses only one pathway (food), and we don’t yet have robust tools to measure people’s actual total exposure. If reducing exposure matters to you, organic certification prohibits synthetic herbicides, and organic oat products generally test at lower or undetectable levels. Either way, a diet rich in whole grains, conventional or organic, is far better for your health than one that omits them out of fear of residues. On the farm: Occupational exposure is orders of magnitude higher than consumer exposure. Farmers and farm workers who mix, load, and apply glyphosate-based herbicides, especially without protective equipment, face meaningfully different risk profiles. Proper PPE isn’t optional. Integrated weed management strategies that rotate chemical modes of action are also worth taking seriously, both for health and for long-term effectiveness. If you live near a farm: Spray drift is real. Concentrations near field edges can spike during and after application, particularly on windy days. This is an area where I think public health could really step up and empower rural communities with buffer zones, rather than placing the onus on individuals. But for now, knowing your local agricultural calendar and keeping windows closed during application are the first steps. Bottom line Dewayne Johnson was exposed to glyphosate at levels most people will never encounter, and a jury decided he deserved compensation. That outcome is not evidence that the oatmeal in your pantry is dangerous. But it is a reminder that the dose, the context, and the person doing the exposing all matter enormously. Glyphosate is a chemical tool with benefits, trade-offs, and genuine open scientific questions. Learning to hold that complexity without collapsing into panic or dismissal is, honestly, one of the most useful and hardest things to do in navigating modern health science. Love, YLE Your Local Epidemiologist (YLE) is founded and operated by Dr. Katelyn Jetelina, MPH PhD—an epidemiologist, wife, and mom of two little girls. Hannah Totte, MPH, is an epidemiologist and YLE Community Manager. YLE reaches more than 425,000 people in over 132 countries with one goal: “Translate” the ever-evolving public health science so that people will be well-equipped to make evidence-based decisions. This newsletter is free to everyone, thanks to the generous support of fellow YLE community members. To support the effort, subscribe or upgrade below: Subscribe
Service & Solidarity Spotlight: Kaiser Health Care Professionals Ratify New Contracts, Winning Vital Patient Safety Protections
Health care professionals, members of United Nurses Associations of California/Union of Health Care Professionals (UNAC/UHCP, AFSCME), voted to ratify new contracts with Kaiser Permanente, winning critical protections that will directly improve patient care.
California's Ro Khanna was riding high, then came the billionaires
As he lays the groundwork for a presidential bid, Ro Khanna couldn’t ask for a more perfect opportunity to burnish his credentials than a fight with billionaires.
Upset winner Gray Davis on California's last wide-open governor's race
Gray Davis was a huge underdog who prevailed in a wide-open 1998 contest. The Democrat urges trailing hopefuls to ignore pressure to quit and 'follow your heart.'
Bergamot Comedy Festival creates space for comedians to fail, grow and belong
The Bergamot Comedy Festival returns to the Crow in Santa Monica with a mission to nurture not just comedians but the surrounding community.
Pulitzer winner 'Fairview' is a little cloudy in its L.A. premiere
Jackie Sibblies Drury's Pulitzer Prize-winning drama "Fairview" receives its L.A. premiere at the Matrix in a Rogue Machine production directed by Oz Scott.
The labor leader behind California’s billionaire tax showdown
For decades, Dave Regan has used California’s direct democracy system in a relentless campaign to shore up union power — and his own. But his newest mission is on an entirely different scale.
Moses Moody receives generous injury rehab offer from Arkansas' John Calipari
Golden State Warriors guard Moses Moody received an offer to rehab his knee injury at Arkansas by current head coach John Calipari.
Plans for forum to replace scrapped USC governor's debate fall apart
A proposed forum cobbled together after USC canceled its gubernatorial debate fell apart as candidates of color excluded from the previous event were unable to show up in person, sources said.
'13 Going On 30' is getting a Netflix reboot: The details
Netflix is rebooting the classic rom-com '13 Going On 30,' and the new iteration will star Emily Bader and Logan Lerman.
Prep baseball: ECR wins first game of series against Birmingham
A five-run first inning propels El Camino Real past Birmingham for first place in West Valley League baseball.
Jay-Z felt 'uncontrollable anger' amid sexual assault, rape lawsuit
Jay-Z has broken his silence about the lawsuit that accused him and fellow music mogul Sean "Diddy" Combs of raping a teenage girl more than two decades ago.
Defiant Democratic candidates in California governors race dig in
State Democratic Party leaders, including Gov. Gavin Newsom, appear unwilling to force lower-polling Democrats out of the race.
Divided Supreme Court weighs the right to seek asylum at the southern border
The case posed a fundamental clash between the government's need to manage surges at the border and the moral and historic right to offer asylum to those fleeing persecution.
Newsom says he regrets earlier comments likening Israel to an ‘apartheid state’
California Gov. Gavin Newsom said that he regretted using the word “apartheid” to describe the Israeli government’s treatment of Palestinians, though he warned “that’s a word you may hear others use” if Prime Minister Benjamin Netanyahu pushes for territorial gains.
UC Berkeley’s Lawrence Hall of Science to host Earth Day celebration, month of events
The Lawrence Hall of Science, University of California, Berkeley’s public science center, will host its third annual Earth Day Celebration on April 26,
World TB Day: Scaling workplace healthcare interventions
Four lessons from the End Workplace TB initiative could help other private sector-led campaign coalitions to scale their workplace healthcare programmes.
Alliant Private Client Strengthens Entertainment Practice with Addition of Michelle Quintero
IRVINE, Calif., March 24, 2026--Michelle Quintero has joined Alliant Insurance Services as Executive Vice President with Alliant Private Client. Based on the West Coast and recognized by Risk & Insurance® as a 2026 Entertainment, Hospitality & Gaming Power Broker®, Quintero brings more than 25 years of technical acumen and delivers tailored solutions to high-profile and celebrated individuals in music, film, and live events.
Crowded Democratic race for California governor could open door for Republicans
The candidates will clash on Tuesday at a debate.
Crowded Democratic Race for California Governor Could Open Door for Republicans
By Joseph Ax and Costas Pitas March 24 (Reuters) - By many measures, California is the center of the Democratic Party's political universe. The most populous U.S. state, it is home to both the party's last presidential nominee, Kamala Harris, and possibly its future one, Governor Gavin Newsom. But ...
Opinion | Nothing against California-based Sutter Health, but Allina’s local governance matters
Allina is built on a "model of care that puts patients and families at the center of everything. That is not something that transfers automatically with a transaction. It has to be protected deliberately, by people who understand what it is and why it matters," the writer says.
Newsom Talks Trump, 2028 — and Where He Draws the Line on Israel
The California governor opens up about family, risk and the choices that could shape his political future.
High school baseball and softball: Monday's scores
CIF City Section and Southern Section high school baseball and softball scores for Monday's games.
Corona Santiago hands Corona its first baseball defeat behind Troy Randall
Corona Santiago baseball takes the first game of three-game series over Corona with a 6-2 victory.
Demand for GLP-1 pills and shots surges, and not just for weight loss
Use of blockbuster anti-obesity drugs like Wegovy and Zepbound is growing, with about 1 in 8 adults in the U.S. saying they currently take the medications.
Utah Sen. John Curtis helps lead push to ban sports betting contracts on prediction markets
Utah Sen. John Curtis and California Sen. Adam Schiff are leading a push to make clear that sports prediction markets are indeed gambling.
California governor debate draws backlash over who made the stage
Only six of the ten prominent candidates will be on the debate stage.
'Sled head': Lawsuits against USA Bobsled/Skeleton allege brain injury
Three personal injury lawsuits have been filed on behalf of elite bobsledders who claim officials intentionally concealed evidence that the sport causes brain injuries.
UCI Health says it will lay off 150 in 'strategic restructuring'
About 1% of the system's workforce is expected to be laid off as the county's only academic health system restructures, citing cuts at the federal level.
Meet Three Sagehens Playing Spring Sports in 2026 | Pomona College in Claremont, California
The spring sports season offers a smorgasbord of options for Sagehens fans, with teams taking to the diamond, track, pool, field and golf course to test their mettle against Division III athletes from across the country.
Review: Inside the night Jo Koy and Fluffy made comedy history at SoFi Stadium
The veteran comedians created an intimate experience despite the enormous venue, drawing the crowd together through storytelling and humor from start to finish.
Beyond The Hype: How AI Is Rewiring Fashion’s Art And Science
AI is recalibrating fashion from design to supply chain. Explore how leaders at Levi’s, ALO Yoga, and REVOLVE bridge data-driven precision with human-inspired creativity.
F1 CEO talks US growth as business accelerates
Formula One (F1) CEO Stefano Domenicali joins Yahoo Finance Executive Editor Brian Sozzi to discuss F1's rapid growth in the US market, new racing regulations, and more. Watch the video above to hear more on the sport's focus on expansion and entertainment.
Californians may need to mail ballots early as Supreme Court signals support for new election day deadline
California counts mail-in ballots that arrive up to seven days after election day, but that option may be deemed illegal
Trump attacking Newsom's dyslexia proves president's incompetence
President Trump claims Gov.
UCLA tries to enjoy rare opportunity for Lauren and Sienna Betts
UCLA works to celebrate Lauren and Sienna Betts as successful sisters and individual playmakers pushing to help the Bruins win.
Data centers under scrutiny by California lawmakers as fears rise about health and energy impacts
Due to health and energy concerns, the California Legislature is considering bills to prohibit data centers from being exempted from the state's stringent environmental law and impose new tariffs on new major energy users that strain power supplies.
'ET's' archive has William Shatner on a whale and a young Taylor Swift
'Entertainment Tonight' is digitizing and preserving its archive of 45 years of interview set visits and red carpet walks, which include gems like George Clooney's first interview.
In California, a Republican Sheriff Seizes Ballots, Prompting Concerns
Riverside County Sheriff Chad Bianco, a candidate for governor, recently took possession of more than 650,000 ballots as part of a fraud probe. Election officials say his investigation is baseless.
Winners and losers from first weekend of the NCAA tournament feature John Calipari, Darryn Peterson, Big Ten and blue bloods
Bucks, Clippers still hoping to make playoff runs
The Los Angeles Clippers will welcome an old friend back into town Monday when former head coach Doc Rivers and his current team, the Milwaukee Bucks, make a visit to Inglewood, Calif.
The DLSS 5 Backlash Is Still Swirling
Almost a week on, the controversy and backlash over NVIDIA’s DLSS 5 announcement are still swirling, following some mixed messaging from the company about how the tech works. A reveal trailer on Tuesday showcased multiple games like “Resident Evil Requiem,” “Starfield”, and “Hogwarts Legacy” using the new technology, which goes beyond simple upscaling and leads […]
California Politics 360 Full Episode | Sexual abuse allegations against César Chávez
Civil rights leader Dolores Huerta broke her silence, saying she was also sexually abused by Chávez. It led to the birth of two children, a secret she kept for 60 years.
The Times' top 25 high school baseball rankings
St. John Bosco and Sherman Oaks Notre Dame remain unbeaten in high school baseball
Your Thymus and Your Healthspan
Our thymus gland plays a central role in the development or our immune system, specifically for supporting T cell development (how these cells got their name, maturation and differentiation in the thymus) and discriminating between self and foreign, non-self antigen proteins with production of dendritic cells. As we age, our thymus gland shrinks—the process known as involution—with progressive change from spongy to fatty tissue, with loss of functionality. But this process, with respect to timeline and extent, markedly varies from one person to the next. And to make things even more complicated, our thymus gland anatomy and precise location in the chest also is highly variable. So the famous Frank Netter diagrams from the 1960s (such as at left below) don’t capture the remarkable heterogeneity that a random set of 12 chest CT scans (below at right). What I consider as 2 landmark papers in Nature this week (here and here) used AI to quantify health of the thymus in 2 large cohorts, and then correlate the metric to a broad array of health outcomes. In this edition of Ground Truths, I’m going to cover three questions: (1) How was thymus health determined by AI?; (2) How is thymus health linked to key clinical outcomes? and (3) Are there ways we can promote a healthy (aka rejuvenate) thymus gland in our later years? Subscribe 1. How was thymus health determined by AI? This was accomplished by extensive work developing and validating an AI pipeline for 2 stages, the first for localization and segmentation of the thymus bed, and the second to quantify a digital marker, termed the thymic health score. There’s a lot to this algorithmic development, so I won’t go into all the details, but just provide a rudimentary outline of what was done. The 1st stage used supervised learning with 2 radiologists reviewing 2,461 chest CT scans. That work trained a 3D U-Net model to automatically identify the thymic bed’s 3D cropped region using center of mass coordinates, which reached 99.8% accuracy. The 2nd stage used a foundation model that was pre-trained with SwAV (which stands for Swapping Assignment between multiple Views), a self-supervised model, that generated a high-dimensional thymus representation of 4,096 features. That compares to the radiology reductionist and subjective scoring of 0 to 3 where 0 means the thymus is fully degenerated and fatty, and 3 is considered dense, intact glandular soft tissue. Notably, the self-supervised learning (SSL) performance was superior to supervised (AUC ~0.75 vs 0.55, respectively) reflecting the shallowness of the 0-3 classifier vs SSL’s holistic, self-taught AI. The thymic health score ranged from 0 to 100, with the highest number indexed to fully preserved thymic health. The algorithmic work extended to explainability with both Shapely value distribution, meaning the model was holistic not relying on any “magic” pixel, and occlusion sensitivity, demonstrating the model’s performance was not affected by ribs, sternum, lung tissue, but rather focused on the thymic bed directly. Below are a few saliency maps from the occlusion sensitivity that indicate the thymic bed focus, not affected by neighboring structures, using the jet color scale. Now the AI was ready for processing ~25,000 CT scans, each over 30 MB files, from the 2 large participant cohorts to provide a thymic health score, it did so in less than 14 hours, which is less than 2 seconds per scan! Share 2. How is thymus health linked to key clinical outcomes? The two cohorts were the National Lung Screening Trial, NLST (N=25,031) and the Framingham Heart Study, FHS (N=2,581) each with baseline demographics and long term follow up of >12 years for health outcomes. From the NSLT, you can see below that increased age and body-mass index were correlated to reduced thymic health. And, overall, men had reduced thymic health scores compared with women. There are a lot of graphs in the paper for outcomes, for both the NLST and FHS cohorts. To simplify the major outcomes, below is a composite Figure with striking reduction of all-cause mortality and for the different causes of death. The results were consistent between the 2 cohorts. For example, the cardiovascular mortality hazard ratio average was 0.57 in NLST and 0.38 in FHS (weighted to be 0.53 for the aggregate). The reduction of mortality also extended to digestive diseases and pulmonary disease (data not shown below). Lung cancer incidence was reduced by 36% for high vs low thymic health (Figure below, with a panel -incidence and b panel-mortality, adjusted for age, sex, BMI, smoking status). Notably, there was a smoker’s paradox: lower incidence and improved survival for lung cancer in smokers who had a high thymus health score. Smoking was associated with lower thymic scores whereas alcohol was not. Higher thymic health was linked to higher HDL cholesterol, lower triglycerides, lower fasting blood glucose, and lower systolic and diastolic blood pressure. Inflammation biomarkers, such as C-reactive protein and interleukin-6, were elevated in the people with lower thymic health scores. In their second paper, the same team looked at the relationship between thymic score and outcomes for 3,476 patients receiving cancer immunotherapy. The non-small cell lung cancer progression-free survival was reduced in patients with low thymic health score. A parallel relationship for survival was seen for other types of cancer including melanoma, breast, and kidney with a 44% lower risk among high thymic scores (Figure). A similar pattern was seen with different immune checkpoint inhibitors. The thymus health score outperformed programmed death ligand-1 (PD-L1)and tumor mutation burden (TMB) assay of the tumor and was an independent prognostic marker of progression-free survival. In this dataset, a direct connect with thymus score and adaptive immune function was noted with a correlation before cancer treatment for both T-cell diversity and thymus T-cell production (a metric known as T cell receptor excision circles). Thymus Removal Study There is a highly relevant citation about thymus function before moving onto ways to rejuvenate it. In 2023, a very important study of thymus removal during cardiothoracic surgery was published, with 1146 patients undergoing thymus removal vs 1146 matched controls (mean age 55 years). The adverse outcomes for thymus removal were striking, with a 2.9 higher risk of all-cause mortality and doubling of cancer incidence, 1.5 fold increase in cancer mortality, and 1.5-fold increase in autoimmune diseases. The immune function showed marked compromise after thymus removal, as reflected by CD4+ and CD8+ T cells (Figure below) Share Ground Truths 3. Are there ways we can promote a healthy (aka rejuvenate) thymus gland in our later years? In recent months we’ve learned a lot about the process of thymus involution and the pathways by which this may be modulated. Thymus involution is primarily due to loss to thymus epithelial cells (TECs) and there are 2 subtypes with different functions: the cortical, responsible for positive selection of T cells, and the medullary, for negative selection. When adipose tissue infiltrates the thymus, thymic adipocytes are pro-inflammatory, knocking out T-cell output. Likewise, systemic inflammation, or “inflammaging,” from smoking, obesity, and chronic stress promote thymic adipocytes. Now, from preclinical studies, we know about key pathways that account for these processes. Historically, back in 2014, FOXN1 was recognized as a single master transcription factor essential for TEC function, with studies in mice with forced FOXN1 upregulation leading to thymus regeneration. That laid the foundation for potential regrowth of quiescent thymus cells. It took awhile to find pathways to accomplish this goal and to even refute its role as the master regulator. The Liver-Thymus Axis Feng Zhang and his team recently showed that injection of an mRNA vaccine to the liver encoding DLL1, IL-7 and FLT3-L in combination, factors known to support thymopoiesis (Figure), successfully enhanced immune function in aged mice. However, the effect was transient. The FGF21 Story Two reports in 2025 addressed the thymus gland’s production of FGF21, a growth factor (fibroblast growth factor 21) and its control of thymus involution. This growth factor is also produced by the liver, but it doesn’t have impact on the thymus in aged rodent models. In contrast, The liver’s hepatocyte growth factor (HGF) has been shown to reverse senescent TEC structural changes. Growth hormone stimulates production of insulin growth factor-1 (IGF-1) in the liver and the thymus. Two small studies in human participants (TRIIM, for Thymus Regeneration, Immunorestoration, and Insulin Mitigation) of 6 and 50 people, respectively, treated with combined human growth hormone, metformin and DHEA, suggested the potential of slowing epigenetic aging and improving thymus mass and function. But the combination of drugs, small sample, and lack of controls make conclusions murky. Increased thymus FGF21 led to increased CD8 T cells in old mice and extended healthspan and improved physical performance. Building on the previous FOXN1 data, ablation of β-klotho, the obligatory co-receptor for FOXN1, accelerated thymic aging. The benefit to FGF21 was confirmed in a companion paper using an FGF21 knock-in mouse model showing thymus enlargement and increased TECs throughout the lifespan. (schematic Figure below). The accompanying editorial for these 2 papers speculated: “The proposed link between age-associated thymus involution and organismal aging is intriguing, and suggests we might seek to achieve systemic rejuvenation by counteracting thymic involution.” Other Factors Lessons from the Axolotl (Mexican Salamander) In an elegant set of experiments of the axolotl (Figure), known for its complete thymus regeneration after total surgical removal, mediators were identified. Surprisingly FOXN1 was dispensable. But midkine, a growth factor, appeared to be the driver, the initiator of thymus cell growth, survival, and repair. Other components that contributed were Postn+ (periostin-expressing mesenchymal niches) and Ccl19, a chemokine protein from the bloodstream. RANK and RANKL RANK (receptor activator of nuclear factor κB its ligand (RANKL) have been considered key regulators of medullary TECs. In a study of both aged mice and human thymus cell cultures, their key role was confirmed, with multiple benefits of resorting TEC function, recruitment of progenitor cells, and T cell development. Subscribe Summing Up This body of work strongly supports the health of the thymus gland as a critical regulator of human healthspan, not just a correlate or link. The new landmark studies are reinforced by the regenerative biology experimental models that have shown, via an array of mediators, that healthspan of aged mice is at least in part dependent on thymus gland function and its critical role for maintaining adaptive immunity. It sure seems that we’d be better off having an immune reservoir of naive T cells instead of a profile in older adults of exhausted, low quality, memory T cells, with a senescent phenotype. It is striking that we ignored the importance of the thymus gland for many decades. A wake-up call was the results of the thymectomy matched control study reviewed here, with the opposite of high thymic health score improved health outcomes. The convergence of AI and healthspan here is notable. The exceptional and laborious work for developing and validating (no less explaining) the AI to quantify thymus health set the foundation for probing the connect the major health outcomes in two cohorts with extensive follow-up. We’ve never had a way to meaningfully quantify the thymus gland before, so this represents important leverage of supervised, self-supervised, and transformer models. The study wouldn’t have been possible without AI. And it begs the question as to whether there are ways we can maintain our thymus at a high health score. But it’s not so simple to rejuvenate our thymus. There are multiple risks including the induction of autoimmunity, increasing the risk of cancer, and inducing a pro-inflammatory state. For example, factors that increase TEC proliferation could compromise the medulllary negative selection process and leak out auto-reactive (self-attacking) T cells. Thymic cells could be induced to proliferate, but we know, for example, that growth hormone and IGF-1 are associated with an increase risk of cancer. If thymus rejuvenation doesn’t clear out the accumulated senescent cells in older adults, then inflammation within the gland could block the production of TECs. Keeping these risks in mind, we now have identified many ways to keep our thymus healthy as we age that undoubtedly will be tested in clinical trials going forward. Ultimately, the benefit-to-risk tradeoffs will be defined. In the meantime, we have desperately needed an immunome. As I’ve stressed in multiple prior Ground Truths, we have no test in the clinic to assess a patient’s immune status! It was very encouraging for me to get an email from Hugo Aerts, the senior author of the landmark papers in the days after they were published: “I also wanted to say that your Substack on “Why We Need an Immunome” was inspiring for this work. We found it a very compelling perspective and greatly enjoyed reading it.” Just having an assessment of a person’s immune status via a chest CT scan, with millions of these performed per year, might help in guiding the right immunotherapy for cancer (e.g. more intensive, combinations for those with low thymic health scores) and help define people who are increased risk for age-related diseases of cancer, cardiovascular, and neurodegenerative. The main theme of Super Agers is that we now have many layers of data (genetics, proteins, biomarkers, organ clocks that can be integrated via multimodal AI) for us to define a person’s specific risk decades before one of these age-related diseases leads to symptoms, enabling prevention. From the new studies this week, we can add thymus health score as yet another way to understand a person’s risk, a window into their adaptive immune system and healthspan. And perhaps someday we will be able to safely rejuvenate the thymus, or maintain its health through one’s life, and use the thymus health score to monitor. NB: I wrote this post (No A.I.) A Quick Poll Loading... ********************************************************************* Thanks to Ground Truths subscribers (now > 200,000) from every US state and 212 countries. Your subscription to these free essays and podcasts makes my work in putting them together worthwhile. Please join! If you found this interesting PLEASE share it! Share Ground Truths Paid subscriptions are voluntary and all proceeds from them go to support Scripps Research. They do allow for posting comments and questions, which I do my best to respond to. Please don’t hesitate to post comments and give me feedback. Let me know topics that you would like to see covered. Leave a comment Many thanks to those who have contributed—they have greatly helped fund our summer internship programs for the past two years. It enabled us to accept and support 47 summer interns in 2025! We aim to accept even more of the several thousand who will apply for summer 2026.
Politics Now: March 22, 2026
This week on Politics Now with host John Langeler: Nevada is trying to lessen its reliance on fuel from California. We talk with the vice-chair of the committee tasked with determining how to do th…
Tom Steyer explains why he should be California's next governor
Tom Steyer sat down for an interview with California Politics 360 for a wide-ranging conversation on his run to be the state's next governor.
Assemblywoman Alexandra Macedo says César Chávez allegations are "just the tip of the iceberg"
California lawmakers this upcoming week are set to move quickly to rename César Chávez Day to Farmworkers Day ahead of the holiday that takes place every year on March 31.
Why Small Process Changes Often Deliver the Biggest Business Results
Founders often overlook small operational frictions that drain productivity. Here is how small process improvements can unlock boost scaling.
California sheriff seizes 650,000 ballots in defiance of state officials over election count dispute
Riverside County Sheriff Chad Bianco seized over 650,000 ballots to probe alleged excess votes in California's Proposition 50 special election.
If Mike Johnson Goes, Who Runs House GOP?
The possibility of losing the majority in the midterms has put the Republican spotlight back on Steve Scalise, Jim Jordan and Tom Emmer.
Boys' basketball coach of the year: Mike LeDuc of Damien
The second-winningest coach in California high school history guided Damien to the state Division I championship.
Girls' basketball coach of the year: Alicia Komaki of Sierra Canyon
She came up with a winning formula to defeat Etiwanda and No. 1 Ontario Christian in the Southern Section Open Division championship.
The Times' 2025-26 All-Star boys' basketball team
A look at the Los Angeles Times' 10-member All-Star boys' basketball team for the 2025-26 season.
The Times' final top 25 high school boys' basketball rankings
Sierra Canyon, the state Open Division champion, finishes No. 1 in The Times' final 2025-26 high school boys' basketball rankings.
Southland girls' basketball final rankings for 2025-26 seaosn
A look at the top 20 high school girls' basketball teams in the Southland, led by Open Division state champion Ontario Christian.
Column: Republicans fearing a midterm rout revive Islamophobia as political strategy
The latest twist on replacement theory is the idea that white Americans are in need of saving from dark-skinned "others."
High school baseball and softball: Saturday's scores
CIF City Section and Southern Section high school baseball and softball scores for Saturday's games.
Microsoft says it'll make Windows 11 a calmer OS with fewer upsells or ads, as it tries to win back users
Microsoft has now confirmed it’s scaling back “upsells” (or ads/recommendations) in Windows 11, as it tries to win back users.
You were born with a playlist already in your soul: Why science says musicality is hardwired
We are born with a musical blueprint that might actually be older than language itself
High school baseball and softball: Friday's scores
CIF City Section and Southern Section high school baseball and softball scores for Friday's games.
California settles with El Monte schools over misconduct complaints
The El Monte Union High School District must appoint a compliance coordinator and roll out an electronic sexual misconduct complaint system.
Billionaires, trial lawyers and unions gear up for 2026 California ballot brawls
It costs millions to qualify for the ballot and most measures fail, but that’s not stopping lots of special interest groups from trying
Roomette vs. bedroom on Amtrak's California Zephyr train
I compared the roomette and bedroom accommodations on the California Zephyr, an overnight Amtrak train. The bedroom was twice as big.
Letters to Sports: WBC brings joy back to All-Star-level play
Readers of the Los Angeles Times Sports section give their thoughts and opinions on the World Baseball Classic, Shohei Ohtani and the Lakers.
Mira Costa boys' volleyball defeats rival Loyola in thriller
Mira Costa, the top-ranked boys' volleyball team in the nation, defeats No. 2 Loyola in five sets behind Mateo Fuerbringer's 37-kill effort.
Kaiser Health Care unions ratify new contracts
LOS ANGELES, Cali. (KESQ) — After months of negations, including multiple strikes, UNAC/UHCP health care professionals have voted to ratify new contracts with Kaiser Permanente. During this negotiation period, union members walked off the job in January in what became the longest open-ended strike by nurses and health care professionals in U.S. history, lasting nearly
One arrested, another cited in shoplifting incident at business on East Avenue in Chico
CHICO, Calif. - A Paradise man was arrested and a Forbestown woman was cited by Chico Police in connection to a shoplifting incident at a business in Chico.The Chico Police Department says that at around 12:30 p.m. on Wednesday, March 18, a loss prevention employee observed two suspects stealing several items from a retail business on the 700 block of East Avenue in Chico.Upon exiting the building, the two suspects, a man and a woman, were contacted by the loss prevention employee regarding the stolen items. The employee was able to persuade both suspects to return to the store and hand over the items they had stolen.Authorities say the business expressed their desire to press charges against the suspects and contacted Chico Police to report the crime.Officers reviewed video surveillance that confirmed the employee's account of what happened. Officers then made arraignment for both suspects to turn themselves in the following day.When the suspects, identified as 51-year-old Jamie Leal of Forbestown and 62-year-old Melvin Royal of Paradise, arrived the next day to turn themselves in, authorities say both admitted to their involvement in the incident and elected to write handwritten apology letters to the business.Leal was cited by Chico Police on a misdemeanor charge of shoplifting.Royal was taken into custody and transported to the Butte County Jail, where he was booked on the following charges:Shoplifting with 2+ priors (felony)Shoplifting (misdemeanor) googletag.cmd.push(function() { googletag.display('ad-1514992'); });
Democrats excluded from USC governor debate urge rivals to boycott
Four Democrats running for California governor who were excluded from an upcoming debate at USC urged their rivals to boycott the event because it excludes every candidate of color.
California Health Sciences University medical student celebrates full-circle moment on Match Day
Friday was a big day for medical students across the country. It's Match Day.
Short-Term Cuts, Long-Term Costs: Investing in Health Care for All Californians
Providing health care for all Californians improves health, strengthens communities, and prevents higher long-term costs.