In one of the most ambitious mapping efforts in the history of radio astronomy, China’s Five-hundred-meter Aperture Spherical radio Telescope — better known as FAST — has delivered a cosmic atlas of staggering proportions. The FASHI team, headquartered at the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), has announced the second data release of the FAST All Sky HI Survey, published as a cover story in the journal Science China Physics, Mechanics & Astronomy. Just two years after the survey’s first data release catalogued 41,741 galaxies, the new edition explodes that figure to 156,411 extragalactic sources detected in neutral hydrogen — nearly a fourfold leap that firmly establishes FASHI as the largest census of atomic hydrogen gas in galaxies ever compiled.

The scale of the achievement is difficult to overstate. FASHI DR2 now spans roughly 19,500 square degrees of sky, equivalent to 47.3 percent of the entire celestial sphere, and reaches out to redshifts below z = 0.09 — distances of well over a billion light years. For comparison, the previous benchmark in this field, the ALFALFA survey conducted with the now-collapsed Arecibo telescope in Puerto Rico, charted approximately 31,500 hydrogen-bearing galaxies across about 7,000 square degrees. FASHI DR2 has thus quintupled the galaxy count of its Arecibo predecessor while covering nearly three times the sky area, and it has done so with a sensitivity roughly 0.7 times deeper than ALFALFA’s, measured as a median noise level of 0.57 mJy per beam at a velocity resolution of 6.4 kilometers per second. In radio astronomy, lower numbers mean better sensitivity — and FASHI’s numbers are among the best ever achieved in a blind, wide-area survey.

The engine behind this performance is FAST itself. With its 500-meter dish nestled in the karst hills of Guizhou Province, the telescope remains the most sensitive single-dish radio instrument on Earth at the 21-centimeter wavelength of neutral hydrogen. The survey exploited a 19-beam receiver array, allowing the telescope to sweep the sky in an efficient drift-scan mode that turned routine transits of the sky above the dish into a torrent of data. Crucially, the instrument maintained exceptional stability across five full years of observing, from August 2020 through July 2025. In surveys of this kind, calibration drifts and instrumental fluctuations can quietly corrupt weak extragalactic signals; FAST’s long-term steadiness meant that faint hydrogen emission from distant galactic disks could be stacked, averaged and trusted.

Neutral hydrogen — the primordial fuel of star formation — is invisible to optical telescopes. The 21-centimeter spectral line, produced when the electron in a hydrogen atom flips its spin relative to the proton’s, provides the only direct tracer of the cold atomic gas from which galaxies build their stars. Detecting this feeble signal across cosmological distances requires both enormous collecting area and exquisite receiver stability. A blind HI survey, unlike targeted observations, simply listens to every direction on the sky and catalogs whatever whispers back, making it an unbiased inventory of gas-rich galaxies regardless of their optical brightness, dust content or morphology. That is precisely why such surveys are prized: they catch the dim, gas-dominated dwarfs and bloated hydrogen clouds that optical catalogs systematically miss.

To give the hydrogen detections physical meaning, the FASHI team cross-matched their radio catalog with the two great optical spectroscopic endeavors of the current era: the Dark Energy Spectroscopic Instrument survey and the Sloan Digital Sky Survey. This cross-identification yielded precise optical counterparts for approximately 64,000 sources, anchoring the hydrogen detections to galaxies with measured distances, stellar masses and star-formation rates. From these matches the team constructed a completeness-corrected statistical sample of more than 109,000 galaxies — a sample robust enough to push fundamental measurements into territory previously beyond reach.

The flagship result of the release is a new measurement of the HI mass function, the statistical distribution describing how many galaxies of a given hydrogen mass populate the local universe. Thanks to the sheer sample size and FAST’s depth, the team extended the reliable measurement range of this function down to hydrogen masses of about one million solar masses — roughly 10 to the power 6.2 in solar mass units — a regime where only the faintest dwarf galaxies live. These smallest gas reservoirs are the building blocks of galaxy evolution, the raw material that hierarchically assembles larger systems, and their census has long been fragmentary. Equally striking is the derived cosmic density of neutral hydrogen: Ω_HI equals (4.71 ± 0.03 statistical ± 0.40 systematic) × 10⁻⁴ in units of h₇₀³ Mpc⁻³ dex⁻¹. The statistical uncertainty is a mere 0.6 percent — the most precise determination of the universe’s atomic hydrogen budget ever made at low redshift.

Why does such a number matter? The cosmic HI density tracks how much raw fuel exists for future star formation, and comparing its evolution across cosmic time constrains how galaxies acquire and exhaust their gas. Because atomic hydrogen sits at the interface between the intergalactic medium and the star-forming interstellar medium, its abundance is a sensitive probe of gas accretion onto dark matter halos and of the feedback processes that heat or expel gas from galaxies. Baryonic matter, after all, is hidden in far more places than stars: cold gas, warm gas, plasma in and around halos. A precision measurement of the hydrogen component anchors models of where ordinary matter resides within the cosmic web of dark matter.

The applications of the new catalog ripple far beyond that single number. For galaxy evolution studies, the 156,411 detections provide direct observational constraints on gas accretion, star formation feedback and galaxy transformation — the processes that turn blue, gas-rich spirals into passive red systems. For cosmology, the HI mass function tests galaxy formation models within the prevailing dark matter framework. For large-scale structure work, the survey complements optical galaxy catalogs to trace the so-called HI cosmic web, revealing how diffuse gas threads through filaments and pools in voids — architecture that optical surveys alone can only infer. The dataset will also aid gravitational-wave and transient science: rapid localization of the host galaxies of gravitational-wave events depends on accurate galaxy catalogs, and an inventory of hundreds of thousands of nearby galaxies sharpens those host identifications. Finally, FASHI serves as a pathfinder for the Square Kilometre Array, the giant interferometric observatory under construction in Australia and South Africa, providing benchmark samples against which next-generation interferometric surveys will calibrate their systems and select their targets.

The trajectory of the project tells its own story. When FASHI DR1 appeared, it broke ALFALFA’s long-standing record for the largest blind HI survey. With DR2, the team argues, FASHI has moved from record-breaking to benchmark-setting — a transition that observers of Chinese radio astronomy describe as the shift from follower to leader in 21-centimeter science. The cover of the journal issue reinforces the mood: a warm sunset scene evoking the faint 21-centimeter photons from distant galaxies arriving at FAST after journeys of billions of light years, messengers of the cold gas that permeates the universe.

The survey’s story is also one of institutional perseverance. The work is led by NAOC in collaboration with the Guizhou Radio Astronomical Observatory, the Shanghai Astronomical Observatory, the CAS South America Center for Astronomy, Peking University and other partner institutions, with funding from the National Natural Science Foundation of China, the Chinese Academy of Sciences and the Ministry of Science and Technology of China. Sustained national investment in a single flagship instrument has now produced a dataset whose statistical power no other facility can currently match at these wavelengths.

The full FASHI DR2 source catalog has been released to the public through the FAST data portal, a decision that will likely seed hundreds of follow-up studies in the coming years, from targeted observations of hydrogen-rich dwarfs to statistical analyses of gas in galaxy groups and environmental studies of gas stripping in clusters. As the SKA era approaches, FASHI DR2 stands as both a scientific foundation and a demonstration: that a single dish, used patiently and precisely over five years, can still redraw the map of the gaseous universe. With nearly half the sky covered and a quarter of a million more square degrees potentially within reach, the question is no longer whether FAST will extend the hydrogen frontier, but how far.

Thirty years after a small group of European professors of geriatric medicine first warned that the continent’s fastest-growing population was being cared for by physicians who had never been formally trained to care for them, the program they created to fix the problem is marking its anniversary with a scientific milestone of its own. A new special article published in European Geriatric Medicine documents the research output of the most recent graduating cohort of the European Academy for Medicine of Ageing, or EAMA, and in doing so offers a rare longitudinal measure of how a structured, pan-European leadership program in geriatric medicine translates into scholarly productivity, professional advancement and, ultimately, better care for older people.

The new paper, titled “‘Highlights of latest EAMA’: generation research outputs of the 30-year anniversary cohort,” was authored by Thomas Münzer of the Geriatric Clinic St. Gallen in Switzerland, Hannes B. Stähelin of Basel, and Barbara van Munster of the University of Groningen Medical School in the Netherlands, writing on behalf of the EAMA Board. It arrives at a moment when the demographic arithmetic of Europe has made the question of geriatric capacity more urgent than ever: the proportion of people over 65 continues to climb, multimorbidity, frailty and polypharmacy have become the daily reality of hospital medicine, and health systems across the continent still struggle to recruit and retain physicians trained specifically in the medicine of ageing. The article’s premise is simple but rarely examined with this degree of rigor — if you invest systematically in the education of mid-career geriatricians, what do you get back?

To understand the significance of the anniversary cohort’s research output, one has to go back to the early 1990s, when the group of European Professors in Medical Gerontology published a stark assessment in the journal Age and Ageing. Writing in 1994, Stähelin and colleagues documented that medical gerontology was taught unevenly, and in many countries not at all, in European medical schools. Geriatric medicine, despite being one of the few specialties whose patient population was guaranteed to expand every single year, was frequently a subordinate unit within internal medicine, staffed by physicians who had acquired their expertise on the job rather than through dedicated training. The professors’ conclusion was that Europe needed not merely more geriatricians but a new cadre of academic leaders — clinicians who could teach, publish, shape curricula and advocate for the specialty within their national health systems.

That diagnosis led, in 1995, to the founding of the European Academy for Medicine of Ageing, an intensive postgraduate program deliberately modeled on leadership academies rather than conventional continuing medical education. EAMA’s structure has remained remarkably stable across its three decades: a small, competitively selected cohort of physicians, typically already experienced clinicians, is brought together for a series of residential courses spread over roughly two years, interspersed with mentored projects that require participants to produce original scholarly work. The curriculum spans the full breadth of the medicine of ageing — from the biology of ageing and the physiology of frailty, through geriatric syndromes such as falls, delirium, incontinence and sarcopenia, to the organizational science of acute geriatric units, nursing home medicine, rehabilitation and end-of-life care. Crucially, faculty are drawn from across Europe, exposing participants to radically different national models of geriatric care and building a professional network that persists long after the formal courses end.

The “reloaded” reform of the program, described in a 2018 paper by Roller-Wirnsberger and colleagues in European Geriatric Medicine, formalized what three decades of experience had taught the academy’s faculty. That paper set out explicit competencies and standards for a European leadership program in geriatric medicine, defining what a graduate of EAMA should be able to do: not just diagnose and treat, but design services, lead multidisciplinary teams, mentor juniors, conduct and critique research, and represent the specialty at institutional and governmental levels. The competency framework aligned the academy with modern medical-education theory, in which learning objectives are specified in advance and assessed rather than assumed. It is against this framework that the anniversary cohort’s performance, as documented in the new article, can be read as an evaluation of the program itself.

The central finding of the new special article is that the latest cohort of EAMA graduates has generated a substantial body of research output — the “generation research outputs” of the title — spanning peer-reviewed publications, presentations and ongoing projects in geriatric medicine. Each participant in the program is expected to develop a scholarly project under faculty mentorship, moving from a research question through protocol design, data collection and analysis to presentation and, ideally, publication. For the 30-year anniversary cohort, the academy compiled and highlighted these outputs, creating what the authors describe as the “Highlights of latest EAMA” — a curated snapshot of what a single generation of emerging European geriatric leaders produced during and immediately after their training.

Why does this matter beyond the individual careers involved? The technical answer lies in how research capacity compounds. A single published paper changes one evidence base marginally; a cohort of trained researchers who continue publishing changes the trajectory of an entire specialty. Geriatric medicine has historically been under-represented in high-impact clinical research relative to the burden of disease it manages. Conditions such as delirium, frailty and multimorbidity were for decades excluded from major trials or treated as confounders rather than outcomes, precisely because the specialty lacked enough investigator-trained clinicians to insist on their inclusion. Programs like EAMA attack that bottleneck at its root: every graduate who learns to design a study, secure a mentor and navigate the publication pipeline becomes a node through which clinical questions from the bedside can flow into the literature and back.

The pedagogical machinery behind that outcome is worth examining, because it explains why the anniversary cohort’s productivity is treated by the authors as more than a curiosity. EAMA’s residential courses are built around case-based, small-group learning in which participants bring real clinical and organizational problems from their home institutions and work them through with international faculty. The mentored projects between courses impose deadlines and accountability — the two ingredients that, as anyone who has supervised doctoral students knows, most reliably convert good intentions into submitted manuscripts. The academy also functions as a peer-review incubator: draft papers are critiqued by senior European geriatricians before submission, giving participants exposure to the standards of international journals at a stage of their careers when feedback is most formative.

The anniversary article also carries a personal and institutional poignancy. Hannes B. Stähelin, one of the co-authors, is identified in the publication as deceased; he was among the founding professors whose 1994 analysis launched the academy, and his presence on the author line of a paper published in 2026 spans the full thirty-year arc of the program. The continuity from the GEPMG position paper through the 2002 retrospective review of the academy’s first years, published in Gerontology, through the 2018 competency framework, and now to this documentation of cohort research output, constitutes something rare in medical education: a thirty-year, multi-generation audit trail of a single intervention in specialty training, documented by the people who built it.

For health systems, the implications are concrete. Europe’s national models of geriatric care differ enormously — from the fully established departments of the United Kingdom and the Netherlands to countries where geriatrics is still fighting for recognition as an independent specialty. EAMA’s cohorts deliberately mix these national traditions, so that a geriatrician from a country without an acute geriatric unit model trains alongside colleagues who run such units daily. The research outputs of the anniversary cohort, the authors suggest, function as a form of technology transfer: projects conceived in one system are published in international journals and become adaptable blueprints for colleagues elsewhere. In an era when the European Union explicitly tracks health-workforce capacity, an academy that reliably produces clinicians who can lead services and generate evidence is a strategic asset, not a professional courtesy.

The article is also, implicitly, an argument about how educational interventions should be evaluated. Medical education research is notoriously dominated by satisfaction surveys and self-reported confidence measures, which correlate weakly with actual performance change. Research output — publications generated, projects completed, academic positions attained — is a harder, more objective endpoint, and the EAMA Board’s decision to compile and publish the anniversary cohort’s outputs signals a commitment to accountability by measurable results. It is a methodology other postgraduate leadership programs in medicine, from palliative care to rural health, could plausibly adopt: define the competencies, train against them, and then report what the trainees actually produced.

The publication timeline of the article itself — received in December 2025, revised in April 2026, accepted in June and published on 6 July 2026 in European Geriatric Medicine, the journal of the European Geriatric Medicine Society — places it squarely in the anniversary year it commemorates. As Europe’s population ages at a pace with no historical precedent, the question the founding professors asked in 1994 — who will teach the teachers, and who will lead the specialty? — has an answer that can now be pointed to in print: thirty years of EAMA cohorts, and a newest generation whose scholarly work is documented, highlighted and, the academy clearly hopes, replicated by the cohorts to come.

Every spring, Europe’s forests are showered with far more than rain. Wind-pollinated trees release staggering quantities of pollen into the atmosphere, and much of it eventually settles on leaves, branches and the forest floor. New research now shows that this pollen is not merely biological debris — it is a measurable, taxon-specific driver of nutrient fluxes in the water that drips through forest canopies, a flow scientists call throughfall. The findings, published in Environmental Monitoring and Assessment, provide the first continental-scale evidence directly linking pollen deposition to forest water chemistry, and they suggest that decades of forest monitoring may have been quietly misattributing a slice of nutrient input to other sources.

The study was carried out by a large international team led by Elena Gottardini of the Fondazione Edmund Mach in Italy, working within the ICP Forests programme, a pan-European network that monitors air pollution effects on forests. The researchers analysed throughfall samples collected in 2018 from 60 intensive monitoring plots — known as Level II plots — across eight countries: Belgium, Finland, France, Germany, Italy, Norway, Switzerland and the United Kingdom. The plots ranged in altitude from 14 to 1,900 metres above sea level and were dominated by six tree genera: Abies, Fagus, Larix, Picea, Pinus and Quercus. In total, 196 throughfall samples were collected between February and July, covering the early vegetative season when most European trees flower.

The innovation of the study lies in its methodology. Rather than inferring pollen inputs from nearby aerobiological samplers, the team examined the very same water samples that were being chemically analysed. A known quantity of water from each sample was filtered through a 5-micrometre cellulose nitrate mesh, and a calibrated number of 10-micrometre polystyrene-divinylbenzene microspheres — roughly 155,000 per sample — were added as a counting standard. The filters were then dissolved in acetone, centrifuged, and the resulting pellet embedded in fuchsin jelly on microscope slides. Trained analysts identified and counted pollen grains under 400-times magnification, stopping when about 1 percent of the added microspheres had been counted. From these counts, the team calculated pollen deposition rates in grains per square metre per day, correcting for filtered volume, throughfall quantity and sampling duration.

The results were striking. Fifty-three pollen taxa were identified across the samples, with woody species accounting for 98 percent of all grains. Four genera — Pinus, Picea, Fagus and Quercus — together made up 91.4 percent of the total. Pine pollen alone represented more than half of everything collected, a dominance the researchers attribute to the buoyant air sacs on pine grains, which allow them to travel enormous distances from both local and distant sources. In beech, spruce and pine stands, the pollen of the dominant genus itself prevailed, making up 49.7, 59.1 and 84.3 percent of the local pollen spectrum respectively. In oak stands, oak pollen ranked second at 26.9 percent, behind pine. Data from fir and larch stands were excluded because sampling there did not align with those genera’s flowering periods.

By combining the measured pollen curves with published flowering phenology, the team defined main pollen seasons for each genus. Beech and oak flowering spanned April and May, with beech peaking in the last week of April and oak showing a double peak at weeks 19 and 23, likely reflecting multiple oak species flowering at slightly different times across the wide latitudinal and altitudinal spread of plots. Spruce pollen peaked around weeks 19 to 20, while pine peaked at week 19 with a secondary pulse at week 22. Overall, 57 percent of the throughfall samples fell within their stand’s flowering period for at least half of their collection window, providing a robust temporal overlap between pollen deposition and water chemistry measurements.

The chemical analysis, conducted at the Research Institute for Nature and Forest laboratory in Belgium, quantified major ions including potassium, calcium, magnesium, sodium, chloride, phosphate, sulphate, nitrate, nitrite and ammonium using ion chromatography, alongside total dissolved nitrogen and non-purgeable organic carbon measured on a TOC/TN analyser. Linear mixed-effects models then tested whether pollen deposition rates could predict the flux of these compounds, with plot identity included as a random effect and autocorrelation between repeated samples explicitly modelled.

The answer was a clear yes. Every statistically significant association between pollen and throughfall chemistry was positive, meaning more pollen corresponded to more nutrients reaching the forest floor. Potassium emerged as the star player: its flux was significantly explained by pollen from all four main genera, with pollen accounting for an average of 33 percent of the variance. This makes biochemical sense, because potassium is one of the predominant ions in pollen grains, and pollen washed from flowers and crowns by rain or deposited dry is a direct source of the ion during the flowering season — an idea first proposed decades ago but never confirmed at this scale. The strongest single relationships involved oak pollen, which explained 77.8 percent of the variance in ammonium fluxes and 55 percent in total dissolved nitrogen.

Broadleaved and coniferous pollen left different chemical fingerprints. Beech and oak pollen together significantly explained fluxes of non-purgeable organic carbon, dissolved organic nitrogen, total dissolved nitrogen, ammonium and magnesium, while the combined pollen of pine and spruce was linked with every measured compound except phosphate. Intriguingly, broadleaved pollen showed a weak negative association with nitrate fluxes. The authors urge caution in interpreting this pattern, since several non-exclusive mechanisms could be at play. Laboratory experiments have shown that pollen and its associated microbiota can transform extracellular nitrate into nitrite and nitrous oxide, an effect pronounced in beech and oak but weak or absent in pine and spruce. Canopy uptake of nitrogen and coincidentally lower atmospheric deposition during broadleaf flowering are also possible explanations that this single-year study cannot disentangle.

The dissolved organic carbon carried in throughfall also differed by forest type. Specific ultraviolet absorbance at 254 nanometres, a proxy for aromatic and recalcitrant carbon, was highest in spruce stands, whose needles release lignin derivatives and tannins. The humification index was significantly higher in oak throughfall, reflecting more decomposed, humic organic matter. Most revealing was the fluorescence index, which distinguishes microbial from plant-derived organic matter: beech and oak samples had significantly higher values, with medians near 1.9, than pine and spruce samples, which sat near 1.7. Values above 1.9 typically indicate microbially processed carbon, and the elevated readings under broadleaves suggest microbes play a larger role in transforming pollen-derived carbon in those forests — hinting that pollen inputs feed not just trees but entire soil microbial food webs.

For the authors, the implications reach well beyond academic curiosity. Routine throughfall monitoring has historically ignored pollen as a variable, meaning that chemical enrichment previously attributed solely to canopy leaching or atmospheric deposition may in fact be partly pollenic. As climate change pushes flowering earlier and increases airborne pollen amounts across arboreal taxa, these hidden inputs could grow. Masting behaviour in beech and oak — the episodic, synchronized production of enormous seed and pollen crops — introduces strong year-to-year variability that any nutrient budget must now reckon with.

The researchers acknowledge the limitations of a one-year, correlative dataset and call for multi-year studies incorporating canopy architecture, stand age, phenology and insect infestations, as well as stable isotope tracing or controlled exclusion experiments to nail down mechanisms. Still, the message is clear: pollen is not just about reproduction, or even allergies. It is a seasonal fertiliser delivered from the sky, and forests have been banking on it all along. Incorporating pollen surveys into long-term forest observation networks, the team argues, will be essential for accurate nutrient budgets in a changing climate.