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Former Brazilian leader Bolsonaro's health improves and he could serve sentence under house arrest
One of his doctors says former Brazilian President Jair Bolsonaro has been transferred to a regular hospital room in the capital of Brasilia as he continues to recover from pneumonia
Trump places replica Christopher Columbus statue near the White House
A statue of Christopher Columbus has been placed on the grounds of the Eisenhower Executive Office Building adjacent to the White House, the latest effort by President Donald Trump's administration to recognize the controversial explorer.
Microsoft hires Ali Farhadi to work with Mustafa Suleyman on AI
Microsoft hired Ali Farhadi, former Allen Institute CEO, to join Mustafa Suleyman's AI team as corporate VP.
‘Don’t Make Any Deal’: Trump Tells Republicans to Hold Firm on Shutdown Talks
The president is using the standoff over funding the Department of Homeland Security as leverage to pass a strict voter ID bill. Critics say the bill would place an undue burden on eligible voters.
How Trump shifted from threatening Iran’s power plants to touting peace talks
President Donald Trump’s sudden turnabout and, according to him, rapidly advancing peace talks made for an abrupt shift in the administration’s approach to the Iran war.
Trump’s suspiciously timed announcements on Iran
President Donald Trump’s recent reversal on his big red line for Iran is prompting some questions on what, exactly, is motivating his wartime decision-making.
Rahm Emanuel says federal workers shouldn't bet on politics
Former Obama chief of staff and possible 2028 presidential candidate Rahm Emanuel is calling for a federal employee ban on prediction markets betting.
I was on the Air Canada flight that crashed at LaGuardia
A 22-year-old student was on an Air Canada flight that crashed at LaGuardia Airport. He described the moment of the collision and the aftermath.
After patient deaths, Idaho budget committee approves restoring cut Medicaid mental health programs
The Idaho Legislature will consider restoring mental health programs the state cut to comply with the governor’s order for budget cuts.
Trump makes a detour to Elvis Presley’s Graceland in Memphis during Iran war
Trump took the side trip to Elvis Presley’s home while in Memphis for an event on crime
Scientists Connect “Time Crystals” to the Outside World in Groundbreaking Experiment
A newly demonstrated link between a time crystal and a mechanical system opens a door scientists once thought closed.
Louisiana's health secretary wants AI on the phones and the website
Louisiana residents may see changes in calling the state health department or using its website if it turns to artificial intelligence to save money. The department is examining how it can implement AI over the next few years to make residents’ experiences more efficient and reduce spending, Louisiana Department of Health Secretary Bruce Greenstein said […]
Federal judge sides with Wisconsin in transgender health care suit
A U.S. judge ruled in favor of Wisconsin and 20 other states challenging a Trump administration declaration that tried to limit care for trans youth.
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.
Top business leader demands end to stalemate over City Council's pick for zoning chair
Chicagoland Chamber of Commerce President Jack Lavin said more than 40 development projects have been stalled by City Council's failure to agree on new permanent chair for the powerful Zoning Committee. He wants Mayor Brandon Johnson to forge a compromise to break the stalemate.
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Cheyenne Jackson performs "I'm Feeling Good" on Sunday evening, March 22, 2026, at "Un Salon Moderne à la Nouvelle-Orléans" at the gallery and private residence of Martine Chaisson in New
Woman dies after collapsing inside business while seeking help
AI attack ads are hitting Massachusetts political campaigns
Lawmakers are considering new legislation to regulate the use of AI in political advertising. Have you spotted them?
Woman dies after being shot in vehicle, collapsing in business while seeking help
A woman who was shot inside her vehicle at an Aurora apartment complex and collapsed in a nearby business while looking for help has died, and Aurora police are looking for information about the su…
Mills, Collins on opposite sides of trans athlete issue
Collins, who is seeking a sixth term, posted on social media over the weekend that she’s held a “longstanding position that transgender athletes should not compete in girls’ and women’s athletics.”
Brian Doherty, 57, Dies; Chronicled Libertarians and Other Outsiders
Fascinated by the fringes, he wrote a definitive history of libertarianism and books about underground comics and the Burning Man festival.
Trump’s Political Risk Insurance Plan for Ships in the Gulf Could Benefit China, Says Democratic Senator
President Trump’s $20 billion plan to provide political risk insurance for ships aimed at unblocking the Strait of Hormuz could end up ultimately
Cargo Headed to Station, Week Begins with Science Prep and Maintenance
A cargo spacecraft is in orbit catching up to the International Space Station for a docking tomorrow to deliver food and supplies to the Expedition 74 crew. Aboard the orbital lab, the seven residents kicked off the week with science operations prep, routine maintenance, and getting systems ready for a future spacewalk.
Business Insider welcomes Ryan Kailath
Ryan Kailath joins Business Insider as a Senior Editor on the Economy team.
Trump Poised to Skip CPAC For First Time in a Decade
President Donald Trump is poised to skip the Conservative Political Action Conference this week, breaking with an annual tradition that has helped define his political rise and shaped the conservative movement.
Trump sued by historic preservation groups to block Kennedy Center changes
A coalition of preservation groups is suing to stop major physical changes at the Kennedy Center under President Donald Trump’s renovation plans. On Monday, the groups filed a lawsuit against
Trump was offered an off-ramp to the DHS shutdown but he didn’t take it
President Donald Trump was presented Sunday with a potential off-ramp to the more than month-long Department of Homeland Security shutdown: fund every part of the department except enforcement operations by Immigration and Customs Enforcement, two sources familiar with the conversations told CNN.
I go to Florida often; favorite destination is quiet, lesser-known
I grew up visiting family in Fort Pierce, Florida, and I think of this beach city as a hidden gem. The beaches are relatively uncrowded and beautiful.
Prisco's 2026 NFL mock draft 1.0: Four of top five picks on defensive side, Browns select QB
Teams at top of the draft opt for pass rush over offense.
Welcome, American scientists: Europe, a haven for researchers struggling under Trump
Initiatives are multiplying in EU countries including France, Germany and Austria to attract the talent being driven away by the US president’s policies
Top architectural and historic preservation groups sue Trump over Kennedy Center plans
A consortium of the nation’s top architectural and historic preservation groups is targeting President Donald Trump’s plans to temporarily close and extensively renovate the Kennedy Center, filing a new lawsuit Monday that asks a federal judge to indefinitely halt the project.
Feature: Where The Heck Do You Start If You've Never Played Resident Evil?
Enter the world of survival horror
Trump attacking Newsom's dyslexia proves president's incompetence
President Trump claims Gov.
Trump to Maria Bartiromo: Iran wants to make a deal badly, could be within 5 days or sooner
Maria Bartiromo reports that President Donald Trump says Iran ‘wants to make a deal badly’ as he orders a five-day pause on planned strikes against key infrastructure, signaling ongoing high-level talks and triggering a sharp market rebound.
Lenoir-Rhyne Sports Hall of Fame Nominations Due April 1
HICKORY, N.C. - Nominations for the Lenoir-Rhyne Sports Hall of Fame are due by Wednesday, April 1. The 2026 Hall of Fame ceremony will take place on Saturday, September 19, prior to Lenoir-Rhyne's 6:00 p.m. football game vs. Mars Hill.
Building a Culture of Health: BJACH Opens Armed Forces Wellness Center at Fort Polk
FORT POLK, La. — Bayne-Jones Army Community Hospital marked a significant step forward in supporting warfighter readiness and community well-being with the grand opening of its new Armed Forces Wellness Center on March 23. The center, located on the first floor inside BJACH, provides Soldiers, Families, civilian employees and beneficiaries with access to personalized health assessments, education and coaching designed to improve overall health and performance.
How Healthy Are Meat Sticks and Jerky as Protein Sources?
These convenient snacks are rich in protein and low in calories, but they are considered processed meats. Here's how often you should eat them.
As President Trump’s Attacks on Science Escalate, Big Oil Moves to Avoid Legal Accountability
This piece was originally published in Climate Home News. The Supreme Court of the United States (SCOTUS) recently agreed to hear arguments in Boulder v. Exxon and Suncor a case that could decide whether communities harmed by climate change can hold polluters accountable in state court. Origin
The final four of Business Insider's business-focused bracket
The business-focused March Madness bracket narrows to four trends: SaaSpocalypse, tariffs, longevity, and robotics.
The debate over Trump’s mental health: ‘Malignant narcissist ’ or ‘superhuman president’?
While some warn of the danger of having someone suffering from ‘cognitive decline’ in the White House, his inner circle attributes his outbursts to his iconoclastic personality
My husband and I were laid off at the same time. Instead of panicking, we started our own business that now has 600 employees.
We both lost our jobs. So we started a company.
After being laid off in 2020, my husband and I launched Larroudé from home. Today, the shoe brand employs 600 people and generates millions.
Trump orders War Dept to postpone strikes on Iranian energy sites, citing 'productive' talks to end war
President Donald Trump, in an all-caps post early Monday morning, declared progress toward "resolution" of the war on Iran.
Trump whistleblower Alex Vindman: ‘Sitting on the sidelines was not an option’
Democratic Senate hopeful says experience of being key witness in Trump’s first impeachment makes him right choice for Florida
‘President Trump is right’: The White House’s go-to line about Trump’s false claims
President Donald Trump’s White House spokespeople have a favorite two-step reply when reporters ask them to comment on one of Trump’s false claims.
A Look At PENN Entertainment (PENN) Valuation As Expansion Projects And New Financing Move Ahead
Expansion plans and fresh financing reshape the PENN Entertainment story PENN Entertainment (PENN) has put expansion and balance sheet moves front and center, with new casino and hotel projects in Aurora and Columbus alongside a fresh US$600 million senior notes offering. See our latest analysis for PENN Entertainment. Despite the new projects and financing, PENN’s 1 year total shareholder return of 21.21% and 5 year total shareholder return of 86.08% sit well behind peers. A recent 4.99% 1...
Mailer in Germantown school election has one big problem
An outside political group urges Germantown School District voters to re-elect a candidate who isn't on the ballot.
Staff revolts, secret meetings: Inside the tense fight between Mike Pence and the Heritage Foundation
Mike Pence used to dream of following two successful Donald Trump terms with his own turn in the White House.
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.
MTSU Agrees to Long-Term Extension with NIKE and BSN SPORTS - Middle Tennessee State University Athletics
MTSU Athletics announced on Monday that it will continue to partner with the world's leading brand for apparel and footwear after inking a long-term extensio...
OpenAI talent flow: See who's feeding into and hiring away employees
Big Tech, particularly Google, was a huge feeder for OpenAI. Many employees landed at smaller startups after they left Sam Altman's AI giant.
Inside the Turmoil at RFK Jr.’s CDC, as Told by Current and Former Employees
Forty-three current and former C.D.C. employees on the changes they say are replacing science with ideology — and making Americans more vulnerable.
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.
When Voters Worry About ‘Affordability,’ Many Point to Health Care
Democrats have had limited political success running on the Affordable Care Act, even with its relative popularity. Now President Trump’s health care cuts may have given the issue new resonance.
Rising Health Costs Push Some Middle-Aged Adults To Skip the Doc Until Medicare
Adults ages 50 through 64 faced some of the steepest increases in out-of-pocket costs for Obamacare plans after a set of federal subsidies expired at the end of December. Some say they are putting off care or considering dropping health insurance coverage until Medicare picks up the bill.
Scientists See Converging Evidence of Antarctic Ice Retreat
A sediment core spanning millions of years and new modeling studies point to significant ice retreat under temperatures similar to today.
Leeds 0-0 Brentford
Paul: Leeds played as if they are frightened of losing rather than trying to win. Chris: Good point in the end - they are a good side pushing for a European place and have good players. Hopefully in the final run-in we will see more of Daniel James, Wilfried Gnonto and Noah Okafor, especially in the home games, to create more goals and keep us in the Premier League.
Grab Strikes $600 Million Deal for Foodpanda Taiwan Business
Grab Holdings Ltd. agreed to buy Delivery Hero SE’s Foodpanda operations in Taiwan for $600 million, a deal that marks its first foray outside of its Southeast Asian home market.
Kathy Ireland Accuses Business Managers of Looting Her Fortune
The model-turned-entrepreneur and lifelong Santa Barbara resident claims decades-long deception left her virtually broke.
Pfeiffer, Pulley Join The Core Entertainment Leadership Team.
The Core Entertainment has added Sarah Pfeiffer as Head of Marketing and Gabriella Pulley as Chief of Staff. Both will report to Co-Founders and Co-CEOs Simon Tikhman and Chief Zaruk
Cursor acknowledges its new low-cost coding model has Chinese roots
Cursor says its new coding model builds on Kimi K2.5, a Chinese model it didn't mention at launch.
At 85, I can still work out on the bars and do headstands with my wife
Peng Lin Hua, 85, says retirement didn't slow him down. He and his wife split their time between two countries.
Trump’s new red line could set the Iran war on a fateful course
On Friday, President Donald Trump said he was considering “winding down” his war with Iran. But a day later, he threatened to “obliterate” the country’s power plants in an escalation that could further tip the conflict out of control.
How Obama’s Strategist Discouraged Biden From Running in 2016
In a new set of oral histories, David Plouffe, President Barack Obama’s political adviser, described how he urged Vice President Joseph R. Biden Jr. not to challenge Hillary Clinton for the nomination.
The Christian Science Monitor Daily for March 23, 2026
Rethink the news: Reducing news to hard lines and side-taking leaves a lot of the story untold. Progress comes from challenging what we hear and considering different views.
Norman City Council to consider ordinance repeal related to Rock Creek Entertainment District
Norman City Council will consider repealing an ordinance related to the Rock Creek Entertainment District during its Tuesday meeting, according to a council member’s social media post.
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 […]
Samsung reverses big S Pen change for Galaxy S27 Ultra after bold experiment fails
Samsung has backed away from one of its more ambitious S Pen experiments for next year’s Galaxy S27 Ultra, choosing to stick with its long-standing digitizer-based input system after testing a radically thinner alternative. According to ETNews, Samsung had been exploring a new pen technology that could eliminate the digitizer layer inside the display. The […]
24-year-old killed after shooting outside Last Call Sports Bar
24-year-old killed after shooting outside Last Call Sports Bar
Statue of Christopher Columbus installed on White House grounds
A statue of Christopher Columbus has been erected outside of an ornate federal office building on the White House grounds — the latest sign of the Trump administration’s efforts to reshape cultural and historical representations across the nation’s capital.
Arizona Diamondbacks Spring Training Gameday Thread, #30 @ Padres
Roster moves The Arizona Diamondbacks made the following roster moves and have 33 players in camp. Optioned to Triple-A Reno: Reassigned to Minor League camp: The first of these is a bit of a surprise. Only yesterday, I was noting how Abner seemed to have the inside track for left-handers job, after the recent meltdowns […]
Joe Kent says he wants Donald Trump to hear MAGA opposition to Iran war
It’s a concerted effort, Kent said, to rally members of the president’s Make America Great Again movement and ensure he hears dissenting voices.
Chelan Co. Sheriff’s Office secures nearly $55k in funding for behavioral health unit
The Chelan County Sheriff’s Office has secured nearly $55,000 in outside grant funding to support and expand its behavioral health crisis response program, allowing the agency to add training, equipment and other resources without using county funds.
Binghamton ranked No. 1 public business school in New York state
The Binghamton University School of Management jumped ahead in the prominent Best Undergraduate Business Schools of 2026 ranking by Poets & Quants, placing No. 1 among New York state’s public business schools.
Politics, protests and popular culture: The University of Minnesota community responds to ICE impact through memes and music
Outside Coffman Union on March 3, The University of Minnesota’s Students for a Democratic Society protested Immigration and Customs Enforcement’s presence in Minnesota and on campus, despite reports that Operation...
This Couple Turned A Facebook Marketplace Side Hustle Into A Seven-Figure Business
When Harrison Gordon and Paige Sandher couldn't find a modular custom sofa that was also affordable, they designed their own. They built a fast-growing business around their idea.
Oil prices rise after Trump issues ultimatum and Iran threatens to close the Strait of Hormuz indefinitely
Oil prices rose Sunday after President Donald Trump threatened to “obliterate” Iran’s power plants if the Strait of Hormuz is not reopened by Monday evening.
Man Born with ‘Butterfly Syndrome’ Is Fighting for Change for ‘the Worst Disease You’ve Never Heard of’ (Exclusive)
Ohio resident Shane DiGiovanna, who has the rare disorder epidermolysis bullosa (EB), is advocating for legislation to help cover costly medical bandages for patients with the disease, which is also known as ‘butterfly syndrome.’
The FBI Just Issued A Warning About A Hidden Threat In Your Home Wi-Fi Network
The FBI is warning that criminals may hijack your home Wi-Fi through residential proxies, using your IP address to hide illegal online activity.
Cockroaches with smart backpacks? Scientists turn insects into cyborgs to detect hidden pipeline leaks
Science News: Although the concept seems like something from science fiction, science is rapidly adopting it. Researchers have started creating ‘cyborg cockroaches,.
Woman seeks help at Aurora business after suffering serious injuries in shooting
A woman collapsed inside an Aurora business while seeking help after she was shot Saturday night. Police are trying to determine what led up to it.
Minnesota Wild, NHL mourn hockey writer Jessi Pierce after death in house fire
Pierce and her three children were killed in a house fire outside of Minneapolis early Saturday morning.
Michael McCarthy Considering Three Races As Options For Journalism's Return
After Journalism worked five furlongs in company Sunday at Santa Anita, trainer Michael McCarthy said he is looking at three potential races to kick off the colt’s 4-year-old campaign. Journalism could return in either the Oaklawn Handicap (G2) or Ben Ali (G3) at Keeneland, both on April 18, or ...
Federal union says 'untrained' ICE agents shouldn't replace TSA
President Donald Trump said he would tap ICE agents to run security at US airports as unpaid TSA officers stop showing up to work.
Israel Thought It Could Spur Rebellion Inside Iran. That Hasn’t Happened.
President Trump’s hopes that an Israeli plan to ignite an internal uprising against Iran’s theocratic government could bring the war to a swift end have so far been dashed.
Kentucky Gov. Beshear takes jabs at JD Vance in his home state of Ohio
Kentucky Gov. Andy Beshear, speaking in JD Vance’s home state of Ohio on Saturday, tore into the vice president, questioning his Appalachian roots and telling voters they “deserve better.”
'Disgusting.' Democratic senator slams Trump's reaction to Mueller's death
Sen. Chris Murphy called President Donald Trump's response to the death of Robert Mueller "disgusting."
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.
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