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These Creatures Have One Cell and No Brain. Scientists Just Discovered They Can Learn.
In 1897 Russian physiologist Ivan Pavlov proved that animals can be trained using associative learning. A new study finds that even single-celled organisms can behave like “Pavlov's dog.”
Brown Named College Sports Communicators Academic All-District
Guard Malea Brown of the Longwood women's basketball team has been named to the 2025-26 Academic All-District® NCAA Division I women's basketball team as selected by the College Sports Communicators, the organization announced Tuesday.
Live Science Today: Jensen Huang AGI claim and major leap to reanimation after death
Tuesday, March 24, 2026: Your daily roundup of the biggest science stories making headlines.
Three Hawks Named to College Sports Communicators Women's Basketball Academic All-District Team
WEST HARTFORD, Conn. - On Tuesday, the College Sports Communicators (CSC) Academic All-District women's basketball teams were announced with three members of the Hartford volleyball team featured.
Parker Named to College Sports Communicators Academic All-District Team - University of Massachusetts Athletics
K'Jei Parker of the Massachusetts men's basketball team has been named to the College Sports Communicators Academic All-District Team, as announced on Tuesda...
Steven Corcelli named William K. Warren Foundation Dean of the College of Science
Steven A. Corcelli, professor of chemistry and biochemistry at the University of Notre Dame, has been appointed the William K. Warren Foundation Dean of the College of Science by University President Rev. Robert A. Dowd, C.S.C., effective April 1. Corcelli, who has served as interim science dean since July, was selected through a comprehensive national search launched after his predecessor, Santiago Schnell, was appointed as Dartmouth’s provost.
How Maryland’s Megan Kelly Walter became a champion in two NCAA sports
Megan Walter was recruited as a two-sport athlete in field hockey and lacrosse coming out of Holton-Arms School in nearby Bethesda.
Holland & Knight Health Dose: March 24, 2026 | Insights
Congress faces a tight deadline on DHS funding and the SAVE Act as Easter recess nears, while healthcare hearings continue amid uncertainty.
4 Pitt people were named Pittsburgh Business Times 2026 Women of Influence
The awards recognize the region’s businesswomen, including one Pitt dean and three alumnae, who make impactful change by leading organizations.
Six Panthers selected to College Sports Communicators Basketball Academic All-District Teams
CEDAR FALLS, Iowa --- Six members of the UNI men's and women's basketball teams were recognized by College Sports Communicators (CSC) with Academic All-Distr...
Gechter exit sealed? This Bundesliga club is his likely destination
According to a report by 'Sky', Linus Gechter's exit from Hertha is likely a done deal. The 22-year-old Berliner, who is under contract with Hertha until 2028, is reportedly on the verge of moving to ...
Parolin Named to College Sports Communicators Academic All-District Team - Boise State University Athletics
Dominic Parolin has been named to the College Sports Communicators Academic All-District Team, it was announced on Tuesday.
NCAA Tournament: Cinderella’s not ‘dead,’ she’s just sporting new threads
Cinderella entered the portal. Now she's built different.
CDC dilemma: Nominee may need both MAHA and science chops
As a deadline arrives this week to nominate a Centers for Disease Control and Prevention director, some Republicans are skeptical the administration will find someone who can check all the boxes necessary for confirmation. The candidate will need the “Make America Healthy Again” mindset of Secretary Robert F. Kennedy Jr.’s Health and Human Services Department, […]
‘It’s a big deal’: Election expert weighs in on the Supreme Court case that could upend midterms
City hosts workshop on business license renewals
The City of Paducah’s Finance Department hosted an informational workshop on business license renewals on Monday to help local businesses understand the process before the April 15 deadline.
We disagreed on politics. We agreed on wine. That was enough.
At the Virginia Governor’s Cup Gala in Richmond earlier this month, a very dapper gentleman approached me and introduced himself. In his light-colored suit and bowtie, he looked very Southern in a classical sense, the sort of Virginia Gentleman you used to see south of the Rappahannock as recently as my college days. “I’m a longtime reader and fan of your writing, if not your politics,” he said. His comment was the proverbial iron fist in a velvet glove, simultaneously conveying praise and disapproval while establishing boundaries. Man, I wish we still discoursed like this instead of shouting bromides and insults to try and “own” our opponents with a funny meme and a furrowed brow. Subscribe “Well, we’ll always have wine to share together,” I said, and thanked him for his kind words. We clinked glasses, exchanged pleasantries about the delicious gold medal-winning wines being poured that evening, and went our separate ways. Our exchange reminded me that more unites us than divides us. Wine brings people together to share a meal and a few hours of joy despite our differences.1 That’s why I refer to the wine community — including readers and consumers — rather than the wine industry. Together, we are so much more than production, distribution and sales statistics. A few minutes later the evening’s awards ceremony began. Applause grew as the 12 winemakers who made the top-scoring wines for the Governor’s Case took the stage, including a loud cheer for Jonathan Wheeler of Trump Winery and his 2018 Blanc de Noir sparkling wine. All the winemakers on stage had reason to be proud, Wheeler perhaps more so. Trump Winery was the only winery to win six gold medals in the competition this year. (Wineries are limited to six entries.) Two of Wheeler’s ciders also won gold medals in a separate competition. When you cover the labels and take the sour taste of politics off your palate, the wines are pretty darn good.2 Then Gov. Abigail Spanberger, newly elected Democrat and Virginia’s first female governor, was introduced to great applause to announce which of the 12 wines had won the Governor’s Cup. She spoke for a few minutes about the importance of wine to Virginia’s economy and tourism and the international acclaim Virginia wine has received. Just two weeks earlier, she gave the Democrats’ response to Trump’s State of the Union speech, but this night wasn’t about politics. That didn’t stop several people in the crowd from speculating on the irony should she have to present the trophy to Trump Winery. In the end, Valley Road Vineyards was displayed on the screen behind Spanberger as the winning winery. Blue Bee Cidery in Richmond took top honors for that category. The crowd cheered a female governor presenting the state’s highest trophy to a female winemaker and then resumed the evening’s festivities, united by their mutual love of wine. A whiff of politics couldn’t dim the cheer of celebration and a community united by its love of wine. In Memoriam: Michel Rolland The global wine community lost a giant March 20, with the passing of Michel Rolland. He was 78. Rolland was the original “flying winemaker,” a globe-trotting consultant who helped Bordeaux regain its mojo in the 1970s and then shaped the rise of Napa Valley cult Cabernet as consultant to Simi, Harlan, Newton, Screaming Eagle, Araujo, Dalle Valle and other wineries. He was instrumental in Argentina’s rise to prominence and even had his own winery, Clos de los Siete, in a partnership with other wine families. Rolland’s career arc paralleled that of Robert Parker, the world’s most influential critic. Parker championed many of the wines Rolland consulted on, helping build his reputation and demand for his services. It also made him a target for Parker’s critics. As W. Blake Gray wrote on Wine-Searcher in his excellent tribute to Rolland: Rolland created the type of wines Parker loved: rich body, plenty of fruit, soft tannins. He sometimes faced the accusation of creating a generic international style of red wine, where the great wines he made in Argentina were indistinguishable from the great wines he made in France. Rolland chafed at that critique, as did many of his fans. He was credited with championing green harvesting and leaf pulling, as well as careful selection of grapes in the winery, practices we nearly universally think of today for high-quality winemaking. “Michel was an incredible innovator who changed how wine was made and how grapes were grown,” Napa Valley winemaker Aaron Pott wrote on Facebook. “His work has transformed the wine trade. He created new ways of looking at wine, tasting wine, evaluating ripeness and quality. … This was not just a man with a ‘style’ that he imposed on vineyards but a man that understood how to make great wine from great sites.” Rolland started his consulting company in 1973 in Libourne, in Bordeaux, with his wife, Dany. Both had graduated the year before from Bordeaux’s Institute d’Oenologie. The couple sold their majority share in the business in 2020, according to Wine Spectator. Over his career, Rolland reportedly worked with more than 100 wineries in 20 countries. He even made it to Virginia, where he consulted for Kluge Estate in the mid-2000s. (Kluge Estate is now Trump Winery.) Reader feedback, please! Last week, I did my first WineLine Live! with Dr. Laura Catena of Catena Zapata winery in Argentina. We enjoyed a fascinating discussion about her efforts to preserve the genetic heritage of old vineyards in Mendoza. I conceived of WineLine Live! for paid subscribers, as a thank you for your financial support. And while only a few people joined live, the video now has more views than I have paid subscribers, so I guess that’s pretty good. Even so, I’m considering opening future installments to anyone on Substack to reach a broader audience. So my questions to you: Should these be public? And what format do you prefer? Live gives a chat feature with the potential for viewers to interact with me and the guest, while a video post would just be that. Another alternative is a podcast, which would just be audio, without video of my chins. Please let me know in the comments. Leave a comment In the Glass A few wines I’ve enjoyed recently: Bonny Doon Vineyard Take Me to Your Liter, Le Cigare Volant, Red Wine of the Earth. 2023, Central Coast, CA. Blend of Grenache, Syrah Cinsaut and Petite Sirah. Delightful wine with expressive red fruit flavors, casual drinking. Doon lovers of a certain age will remember Randall Grahm’s Big House Red; this is more in that style than his original Le Cigare Volant, modeled after Chateauneuf du Pape. The liter bottle makes it an even better value. I see this online at about $15. Great value. Albert Bichot Bourgogne Pinot Noir Origines 2023. 13% - Textbook pinot noir and an excellent, affordable entry (regional) Burgundy. Wine Enthusiast Top 100 Wines of 2025. $24 at Total Wine & More. Loma Larga Pinot Noir 2021 “Coastal Cool Climate Wine”, Valle de Casablanca, Chile. An older sample, showing beautifully. Spicy and fruit forward. I’m seeing widely varied pricing online, from $18-$32. At the lower end, it’s a terrific value. 13.5% Dr. Loosen Riesling Dry 2016, Mosel, Germany. Found this “in the stack.” And it stacked up well, shedding some of its youthful acidity for opulent Riesling character, including a hint of the mineral oil older Riesling often features. A great value, as I’m seeing it as low as $14 online. 12% abv. Red Tail Ridge Blau Franc Blend 2024, Sans Oak, Finger Lakes. 13.4% abv. The name is a neat portmanteau of Blaufrankisch and Cabernet Franc, thus Blau Franc. The blend is 50-50, no oak involved. The Blau dominates on the palate, with the spicy caraway seed (think New York deli rye bread). The Franc adds body. The result is juicy, energetic and joyful. Sokol Blosser Estate Rosé of Pinot Noir 2025, Dundee Hills, Willamette Valley, Oregon. This first rosé of 2025 was a welcome respite to our cold, snowy winter here in the Mid-Atlantic. Oh man, I needed this! Bright and energetic, exuberant even, it perks up the mood and goes down fast. 13%. Certified B Corp. Ingredient and nutrition labeling, and in a modest way that doesn’t occupy a lot of label space. (Since it’s not required, presumably there are no minimum font size requirements.) More wineries should follow this example. Dave McIntyre's WineLine is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber. Subscribe Thanks for reading Dave McIntyre's WineLine! This post is public so feel free to share it. Share 1 Some restraint may be required. 2 Especially the bubblies.
Sarah Michelle Gellar says she and Reese Witherspoon were too shy to ask Adele for a play date
Sarah Michelle Gellar says she and Reese Witherspoon were both too nervous to ask Adele if they could schedule a play date for all of their kids: 'None of us wanted to ask.'
Bucks convert Pete Nance to standard deal
Bucks convert Pete Nance to standard deal
Trump’s New Political Tool: ICE
President Trump has increasingly used Immigration and Customs Enforcement to push personal and political objectives, and on Monday sent agents to airports across the country to help deal with long security lines.
Oil rises as markets assess supply risks after Iran denies US talks
Oil prices rose in early trade on Tuesday on supply fears, as Iran denied it had held talks with the United States to end the war in the Gulf, contradicting President Donald Trump, who said a deal could be reached soon.
Milledgeville teen runs car detailing business in school, wins $1,000 in chamber contest
At 19 years old, Kyan Silas has started a successful business and received second place in the youth entrepreneur program, landing him a $1,000 prize.Kyan Sila
Scientists found a rhino in the Arctic and it changes everything
Scientists have uncovered a new species of rhinoceros in the Canadian High Arctic, revealing that rhinos once lived far farther north than expected. The fossil, dating back 23 million years, is unusually complete and has helped reshape ideas about how these animals migrated between continents. Evidence suggests rhinos crossed from Europe to North America more recently than scientists once thought.
‘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.
Marco Rubio's evolution. Hardliner becomes Trump’s top Cuba negotiator
From hardliner to dealmaker, Marco Rubio evolves on Cuba, taking charge of Trump’s talks with Havana.
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.
S.F. public health boss: Hospital staff stopped stabbing, not sheriff
Daniel Tsai said in a private meeting that protocol failures led to a social worker's death, and contradicted sheriff's account of the incident.
Colorado Sen. Mike Weissman calls for cold water on heated hate speech
Likening the recent record-setting warm temperatures to hot political rhetoric, Colorado Sen. Mike Weissman, D-Aurora, pleaded for an end to death threats and other hate speech directed at lawmakers of both parties. “The increasingly tragic reality of our politics, however, like the increasingly tragic reality of our climate, is one of combustibility,” Weissman said from the well […]
Cincinnati hires Jerrod Calhoun: Utah State coach leaving after two years to guide his alma mater
The Bearcats have agreed to a six-year deal with the 44-year-old coach, a source told CBS Sports
Travis Kelce reportedly re-ups with Chiefs on a 3-year, $54.7 million deal, but there's a catch
Airport chaos is adding urgency to the DHS shutdown debate. But who has the leverage?
DHS has been shut down for more than a month. But extremely long and growing TSA wait times have created newfound political urgency to reach a deal.
5 ChatGPT Prompts To Start Your Own Business From Scratch
Plenty of people want to work for themselves but never start. Use these ChatGPT prompts to go from idea to business owner today.
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
Stephanie Laing Signs With Linden Entertainment For Management (EXCLUSIVE)
Director Stephanie Laing has inked with Linden Entertainment for Management. She remains repped by CAA and Myman Greenspan.
Linden Entertainment Signs ‘Your Friends & Neighbors’, ‘Tow’ Director Stephanie Laing
EXCLUSIVE: Linden Entertainment has signed Emmy-winning director, writer, and producer Stephanie Laing for management. Laing is coming off the theatrical release of her new film, Tow, a comedy-drama s...
Exit polls suggest Italy's Meloni has narrowly lost justice referendum vote
Exit polls on Monday suggested Italian Prime Minister Giorgia Meloni had narrowly lost a referendum on her flagship reform of the judicial system, dealing a potential blow to the ruling coalition ahead of next year's general election.
Jack Gibbens reflects on ‘bittersweet’ decision to leave Patriots
Gibbens signed a two-year deal with the Cardinals in free agency.
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.
Small Business Promotion Week: Hey Honey Marketplace
Jennifer Reeves, nurse turned boutique owner, came up with the idea for Hey Honey Marketplace, a boutique on Abram Street that aims to not just be a store but a community gathering place for women.
UNH Paul College Top Public Business School in New England for Academic Experience and Career Outcomes
UNH’s Paul College ranks No. 63 nationally in 2026 Poets&Quants rankings, leading New England public schools in academic experience and career outcomes.
Sony Is Said to Near $1 Billion Home Entertainment Deal With TCL
Sony Group Corp. is nearing a binding agreement to sell a majority stake in its home entertainment business to Chinese rival TCL Electronics Holdings Ltd. in a deal that may be valued at about $1 billion, according to people familiar with the matter.
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...
'A towering figure in French politics': reactions to Lionel Jospin's death pour in
Lionel Jospin, Socialist prime minister of France from 1997 to 2002, has died.
Diabetes, Overlooked and Unchecked, Poses New Risks in Africa
As deaths from diabetes start to rival those from infectious threats like malaria, a new form of the condition linked to malnutrition is surfacing in patients who can afford neither screening nor care.
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.
Dean for Basic Science Colin Duckett tapped to serve as Boston University Provost
Duckett, executive vice dean for basic and preclinical science, will begin his tenure as chief academic officer at Boston University starting in July.
One dead after shooting at Last Call Sports Bar in Jackson
One person is dead after a shooting at Last Call Sports Bar early Sunday morning.
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.
Apple already has the perfect platform for deploying conversational AI
When Apple initially rolled out Apple Intelligence, the company was pretty openly against the idea of creating a Siri chatbot....
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.
The OG Four-Door Porsche Sports Sedan Wasn't Even Built By Porsche
In 1967, a Texas-based car dealer wanted a four-door Porsche 911 S. Porsche wouldn't make it, so he turned to coachbuilders for help.
'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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