These are short synthesised notes pulling several recent sources together. Agree, disagree, or have a different angle? Send me feedback →
Deep time and the geological record · 13 November 2026
AI and lost fossils sharpen mass-extinction picture
Two threads are reshaping how researchers read Earth's most catastrophic intervals. At the Geological Society of America's October 2026 meeting, the OneStrata project — a transformer-based AI foundation model — was presented as a tool capable of integrating stratigraphic, geochronological, and paleontological data into a unified probabilistic reference system, explicitly challenging the canonical Big Five framework for Phanerozoic marine diversity. Meanwhile, a rediscovered cache of 250-million-year-old Australian fossils, reported by the Swedish Museum of Natural History in the Journal of Vertebrate Paleontology, revealed a surprisingly diverse community of trematosaurid amphibians thriving less than a million years after the end-Permian extinction — predators whose relatives spanned from the Arctic to Madagascar, complicating narratives of sluggish post-crisis recovery. Separately, new zinc-isotope data from the Chattanooga Shale links marine euxinia to increased productivity during the Late Devonian extinctions, and evidence from Fan et al. ties large igneous provinces to at least four Triassic marine die-offs, reinforcing volcanism as a recurring kill mechanism across deep time.
Sources: OneStrata: A foundation model for deep-time biodiversity and mass extinction reassessment · Lost fossils reveal sea monsters that took over after Earth's greatest extinction · 2026 in paleontology
SETI and radio astronomy · 13 November 2026
Space weather, Schelling points, and new survey limits
Three distinct lines of work have advanced technosignature science in 2026. SETI Institute astronomer Vishal Gajjar led a study demonstrating that stellar plasma and charged particles can broaden narrowband radio signals near their source, potentially causing genuine extraterrestrial transmissions to slip below current detection thresholds — a systematic bias that existing survey pipelines have largely ignored. In a separate rapid-response campaign, the Allen Telescope Array scanned interstellar object 3I/ATLAS across 1–9 GHz for over seven hours; all 74 million candidate signals resolved to human-made interference, but the exercise set new upper limits, ruling out transmitters stronger than roughly 10–110 watts on the object. Most ambitiously, the ATA-ASP campaign — led by Sheikh, Hort, and colleagues and posted to arXiv in October 2026 — conducted the first observational coverage of the anti-solar point as a geometrically motivated Schelling point for beacon placement, using the ATSAT pipeline to classify signals into six morphological categories. A concurrent preprint argues that ALMA's planned 2040 upgrade could convert its full observing programme into a commensal sub-millimetre technosignature survey at near-zero additional cost.
Sources: Why SETI Might Have Been Missing Alien Signals · Interstellar object 3I/ATLAS reveals no technosignatures in seven-hour radio scan · A Technosignature Survey of the Anti-Solar Point: The SETI Institute's Largest-Ever Campaign with the Allen Telescope Array · Millimetre/Sub-Millimetre SETI: Expanding the Radio Technosignature Parameter Space with ALMA2040
Endangered languages and linguistic anthropology · 13 November 2026
Terminal speakers and the politics of what survives
2026 has been a painful year for the terminal-speaker record. Verdena Parker, the last fluent first-language speaker of Hupa — a Na-Dene language of California's lower Trinity River supported by Hoopa Valley Tribe revitalization programmes since the 1970s — died in March; Blas Wilfredo Omar Jaime, last speaker of the Charruan language Chaná of Entre Ríos, followed in September. In Brazil, documentation of Ka'gwahíva, a critically endangered Tupí-Guaraní language of the Amazon, was flagged at the August Language Documentation and Archiving Conference as a last-opportunity effort, complicated by the isolation of the remaining community. Against this, the US Administration for Native Americans announced FY2026 preservation grants supporting projects from Comanche immersion schooling in Oklahoma to Chamorro-Carolinian programming in the Northern Marianas, while the University of Victoria's Master of Indigenous Language Revitalization programme graduated cohorts developing land-based pronunciation guides and drama-method curricula — signalling a structural shift toward community-owned pedagogy over external documentation.
Sources: List of languages by time of extinction · Language Documentation & Archiving Conference 2026 — Book of Abstracts · 2026 Preservation and Maintenance — Administration for Native Americans · Master of Indigenous Language Revitalization — University of Victoria
Demographic shifts and fertility trends · 13 November 2026
Global fertility crosses replacement threshold for first time
A landmark paper by Jesús Fernández-Villaverde of the University of Pennsylvania and Patrick Norrick of Northwestern University, prepared for the Annual Review of Economics, concluded that as of 2026 humanity is likely below replacement fertility for the first time in recorded history — a threshold not breached even during major wars or pandemics. Their model, covering 236 countries from 1950 to 2023, finds declining fertility trends in 219 of them, with not one showing signs of levelling off; country-specific factors now dominate a common global driver that peaked in 1978. Most striking is where the steepest falls are occurring: Thailand sits near 0.87 children per woman, Colombia around 1.0, Iran at 1.35, and Brazil at 1.52 — middle-income countries reaching depths once associated only with East Asia. A concurrent Journal of Economic Perspectives analysis by Michael Geruso and Dean Spears reinforces the prognosis, noting that once cohort fertility falls this low it has historically failed to rebound. World population, currently near 8.3 billion, is projected to peak around 2056 at nine billion before entering prolonged decline.
Sources: Terra Incognita: The Economics of a Shrinking World — Global population to peak at 9 billion by 2056 · Global fertility rates fall below the replacement rate for the first time · Economists Say World Population May Have Already Crossed into Below Replacement Fertility · Birth rates are declining in most of the world — here's why it really matters