---
title: "Four Papers, One Method: Run the Mechanism Forward and See What Breaks"
description: "Comet chemistry, alien sea ice, mummy powder and hug memory, tested against real numbers this week"
author: "Luis Goa"
published: 2026-10-31T11:00:00Z
modified: 2026-11-01T01:21:19Z
url: https://rews.cc/a/four-papers-one-method-run-the-mechanism-forward-and-see-wha-d79d40
language: en
tags: ["mummies", "history", "medicine", "archaeology", "aliens", "science"]
publisher: "Rews (https://rews.cc)"
---

# Four Papers, One Method: Run the Mechanism Forward and See What Breaks

*Comet chemistry, alien sea ice, mummy powder and hug memory, tested against real numbers this week*

By Luis Goa · October 31, 2026 · https://rews.cc/a/four-papers-one-method-run-the-mechanism-forward-and-see-wha-d79d40

## In brief

- A Scientific Reports model ran 100,000 simulated comet strikes on early Earth
- 54% of those simulated histories deliver no usable hydrogen cyanide to the surface
- A separate Cambridge-led paper models sea ice on exoplanets as a possible origin-of-life site
- A PNAS study chemically linked a medieval mummy-wine powder to a specific mummified head
- A Bristol survey of 15,049 UK adults found 69.5% remember a hug for a positive reason

A paper in Scientific Reports ran 100,000 Monte Carlo simulations of comet bombardment on the early Earth and found that 54% of the simulated histories deliver zero usable hydrogen cyanide (HCN) to the surface — the molecule the authors use as a stand-in for the prebiotic feedstock life is supposed to have needed to get started. The team, led by Richard Anslow at the University of Cambridge’s Institute of Astronomy, built the model to pressure-test a hypothesis that has circulated since the 1980s: that comets seeded Earth with the raw chemistry of life during the heavy bombardment more than four billion years ago. It’s one of four unrelated papers Becky Ferreira grouped into this week’s science roundup at [404media](https://404media.co/people-used-to-drink-wine-made-from-ground-up-mummies-now-scientists-are-studying-it/), timed, loosely, to Halloween. The other three — alien sea ice, medieval mummy powder, and the psychology of hugging — share a method with the comet paper even if they share nothing else: build a model with real inputs, run it, and see what fraction of the romantic version survives.

## Why hydrogen cyanide mostly doesn’t survive the trip

Two filters do the killing. Most comets small enough to be common are also small enough to fragment or burn up before reaching the ground, the same mechanism that destroys the overwhelming majority of meteors. The ones that do reach the surface arrive fast enough that shock heating on impact cracks HCN apart. Anslow told [the University of Cambridge’s press office](https://www.cam.ac.uk/research/news/comets-didnt-seed-life-on-earth-after-all-new-study-suggests) that the team deliberately picked HCN because it survives impacts better than most candidate molecules — so a failure for HCN implies a worse failure for anything more fragile. Even the impacts that leave some HCN intact face a second filter: the crater fills with groundwater fast enough to dilute the survivors below the concentration prebiotic chemistry needs.

**How a comet's chemistry dies before it matters** Modeled survival path for hydrogen cyanide across 100,000 simulated impacts

| From | To | How |
| --- | --- | --- |
| Short-period comet carrying HCN | Atmospheric entry |  |
| Atmospheric entry | Fragmentation or burn-up *(kills most small comets)* | most break up |
| Fragmentation or burn-up *(kills most small comets)* | High-velocity surface impact | survivors reach ground |
| High-velocity surface impact | Shock heating cracks HCN |  |
| Shock heating cracks HCN | Crater lake forms | if any HCN survives |
| Crater lake forms | Groundwater dilutes survivors |  |
| Groundwater dilutes survivors | 54% of 100,000 runs: no usable HCN |  |

![How a comet's chemistry dies before it matters. Modeled survival path for hydrogen cyanide across 100,000 simulated impacts](https://rews.cc/img/b35a74bab7f5cbd30f079ba5306442ea8248f8b3.webp)

Based on [University of Cambridge](https://www.cam.ac.uk/research/news/comets-didnt-seed-life-on-earth-after-all-new-study-suggests)

Cambridge’s writeup of [the paper](https://www.nature.com/articles/s41598-026-74214-y) describes successful delivery as close to a one-in-a-million occurrence, and says Earth’s first 500 million years offered, at most, a handful of opportunities for it to happen at all — a window the authors place more than 100 million years before the estimated emergence of the last universal common ancestor, around 4.2 billion years ago, meaning even a successful delivery would have arrived too early to be the spark. Mars, with weaker gravity and a thinner atmosphere, lets more comets reach the ground intact at lower speeds; the paper reports substantially more successful HCN deliveries there than on Earth or Venus, though the authors are careful to say that doesn’t mean it happened. The model’s own limits matter: it tracks one destruction pathway, ignores a comet’s internal porosity and strength (both of which the authors expect would make survival rarer still), and compares against modern Martian and Venusian atmospheres rather than the uncertain ancient ones. One model, one molecule — but it shifts the burden of proof back onto a forty-year-old hypothesis that had mostly been assumed rather than tested.

## Ice shelves on alien oceans

A related paper by Edouard Barrier and colleagues at Cambridge, accepted at *Monthly Notices of the Royal Astronomical Society* and posted on [arXiv](https://arxiv.org/abs/2609.07818), looks for a different concentration mechanism on a different class of world. The target is “Hycean” planets — bigger than Earth, smaller than Neptune, with deep oceans under hydrogen-rich atmospheres — plus other sub-Neptune ocean worlds. The team ran ExoCAM, a general circulation model built for simulating terrestrial exoplanet and sub-Neptune atmospheres, to study the boundary between open ocean and dayside sea ice. On Earth, freezing seawater concentrates dissolved nutrients at the ice-water interface; a 2007 paper in *Origins of Life and Evolution of Biospheres* used that effect to synthesize polyadenylic acid chains up to 400 nucleotides long without enzymes. Barrier’s paper argues the same physics should operate on an ocean exoplanet, which gives a planet class astronomers can already observe a plausible chemistry-concentrating mechanism — a theory with a path to being checked against real spectra, not just modeled.

![A stylized polar seascape shows an ice shelf above and below teal water, with coral-colored particles drifting beneath a low sun.](https://rews.cc/img/b7c8530cab8f1eaf7174bc6a9d1c8adcb01e73af.webp)

## The chemistry of mummy wine

A paper in *PNAS*, led by Tim Berger and Amira Naimi at Marburg University, ran chemical analysis on 24 historical objects: mummified remains, embalming residues, bandages, and preparations of *Mumia vera aegyptiaca*, the ground-mummy medicine that circulated in European and Arabic markets from the late Middle Ages into the early modern period, usually mixed into wine. [Coverage of the paper](https://www.medievalists.net/2026/10/medieval-medicines-connection-to-ancient-egyptian-mummies-revealed-by-new-study/) cites historical texts prescribing it for headaches, coughing, sore throats and dizziness. The standout result is a match, not a medicine: untargeted metabolomics linked the chemical fingerprint of a powdered Mumia vera sample to a specific mummified head in the same museum collection, a connection the museum’s own catalogue never recorded. Two of the 24 objects — a skull radiocarbon-dated to the eighth century BCE and an 18th-century preparation from the Löwen Pharmacy in Offenbach am Main, now held at the German Pharmacy Museum in Heidelberg — turned up compounds associated with aloe, the first time aloe markers have shown up in ancient Egyptian embalming material at all.

The team also tested an extract from Marburg’s Wigand Medicinal Collection against influenza-infected cells in culture and found a moderate protective effect. When they isolated the apparent active compound, 7-oxodehydroabietic acid, and tested it alone, the effect disappeared; they could not identify which ingredient, or combination, was doing the protecting. That’s the honest state of the evidence — a cell-culture result on a centuries-old mixture of unknown exact composition, with no claim extended to humans and no single compound to credit. The authors’ own framing is more modest than the Halloween headlines it generated: linking texts, museum catalogues, molecular data and bioactivity testing opens routes for decoding historical medicines, not a case for anyone’s medicine cabinet.

![A vintage-style illustration shows a jar containing a bandaged human bust beside spilled powder, a petri dish, and a pipette releasing a pink drop.](https://rews.cc/img/64ebbb7247a1a0bf59ee073848acb6298adaa93c.webp)

## 15,049 hugs, quantified

A paper in PLOS One, led by Anna Lena Dueren at the University of Bristol, surveyed 15,049 UK adults — recruited through a public broadcasting campaign including the BBC, a subsample of a roughly 40,000-person touch survey — on what they remember about being hugged. 69.5% of respondents, 10,457 of 15,046 who answered, said they remembered a hug for a positive emotional reason. Among the roughly 9,700 who named a specific reason, comfort, support and understanding ranked highest and arousal ranked lowest, with a statistically significant but small gender split (χ²(6) = 320.63, p \< .001, Cramer’s V = 0.18): men were more likely than women to cite arousal or friendliness as the reason a hug stuck in memory.

The clearer predictors were psychological rather than demographic. Higher cognitive and emotional empathy scores predicted a positive hug memory; so did anxious attachment, while avoidant attachment predicted the opposite — “contrasting patterns,” in the paper’s own words, not a simple empathy-equals-warmth story. The regression model built from these traits classified 72.5% of cases correctly but explained only 9.7% to 13.8% of the variance (Cox & Snell and Nagelkerke R², respectively), which is the paper’s own admission that attachment style and empathy are real but modest predictors of what a hug feels like in hindsight. A hypothesis that childhood bedtime-hug routines would predict adult hug memory did not hold up. The sample was about 75% female, which limits how far the odds ratios generalize.

None of the four papers close their question. The comet model rests on one candidate molecule and one destruction pathway; the sea-ice mechanism hasn’t yet been checked against an actual Hycean planet’s spectrum, something current telescopes are only beginning to attempt; the mummy-head match is one data point in a catalogue of 24; and the hug survey’s skewed sample limits how far its regression travels. What the four share is a willingness to run the hypothesis forward with real numbers instead of leaving it as a plausible story. For three of the four, more of the original story broke than survived.

## See also

- [Why we hug: Individual differences predict emotional touch memories](https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0359868) — journals.plos.org · Full PLOS One paper with regression tables and odds ratios