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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 6h

Can I finally learn touch typing after all these tears?

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Pablo J. Varas Enríquez @pablovarase.bsky.social · 15/10/2026

🚨 PUBLICATION ALERT 🚨 Shoutout to my collaborators @dieterlukas.fediscience.org.ap.brid.gy @heidicolleran.bsky.social Riana Minocher and Monique Borgerhoff Mulder for this work Want to know how the amount of wealth and the variability of it influence age at first birth?👇 doi.org/10.1017/ehs....

doi.org

How material wealth influences age at first birth among Pimbwe women from Tanzania | Evolutionary Human Sciences | Cambridge Core

How material wealth influences age at first birth among Pimbwe women from Tanzania - Volume 8

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Gabriel Flynn @gabrielflynn.bsky.social · 14/10/2026

AI researchers warn technology 'months away' from being able to connect to wifi using eduroam

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Katie Spoon @kspoon.bsky.social · 14/10/2026

As a PhD student designing my first survey, I added what I thought was a throwaway question at the end. To my surprise, thousands of academics answered it! The paper is out today: doi.org/10.1093/pnas...

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Thomas Lesaffre 🌱 @thomaslesaffre.bsky.social · 14/10/2026

🌺 New preprint with J.Pannell and @charlesmullon.bsky.social on the joint evolution of selfing and sex allocation! This joint evolution leads to an unexpected outcome: the emergence of androdioecy, which may either be stable or only a step on the path to complete selfing. 📝 ➡️ tinyurl.com/wf9xsv6v

Streamplot taken from the paper showing the joint evolutionary dynamics of the pollen export rate (x-axis) and the competitive advantage maternal plants grant their own pollen relative to other sources (y-axis). Stream arrows indicate the direction of selection.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 14/10/2026

I guess it should now be 100% exams.

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Reposted by Jorge Peña 🇵🇸

Piret Avila @piretavila.bsky.social · 12/10/2026

New paper in Theoretical Population Biology with Laurent Lehmann: “Life history evolution and uninvadable mortality schedules with and without intergenerational energy transfers” 🧵 www.sciencedirect.com/science/arti...

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

I'm saying not really *over the whole space of social dilemmas*. But if you restrict dilemmas to, say, prisoner's dilemmas and stag hunts (i.e., no snowdrift games), I think they could do well (though not better than always defecting, e.g., playing ALLD).

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

But if it is "I defect if I'm bad", one member of this subset of strategies is our PDISC, which does well in terms of stability (perfect scores for stag hunts and snowdrift games, not too bad for prisoner's dilemmas). There is some discussion about PDISC and "honor culture" in the Discussion.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

2. It depends on what the "opposite of contrition" is (contrition is "I cooperate if I'm bad"). If it is "I defect if I'm good", this defines a subset of strategies that are very uncooperative and that don't do well in terms of stability.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

Good questions. 1. Systems that are both highly uncooperative (say, ALLD) and highly stable would fall in the upper-left corner of Fig. 2 (scatterplot in my 2nd post). There are none. ALLD (with any norm) is stable under prisoner's dilemmas and stag hunts, but not under snowdrift games.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

Do not use slides blatantly generated by AI. They look cheap.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 09/10/2026

This is the next level of cleverness in US academia. Do you want to study here? Pay! Do you want to *work* here? Pay! Country of geniuses led by geniuses elected by geniuses.

nature.com

US proposes $100,000 charge for international students to do post-graduate work

Proposed rule would choke off a crucial STEM talent pipeline, policy specialists say

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

It depends on what you mean by "noisy observation." If it is "assessment errors" (reputation is misassigned with some probability, but everyone agrees on it), our results are quite robust. If you mean "private assessment," it is a different story (our model is one of "public assessment").

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Reposted by Jorge Peña 🇵🇸

Richard Sever @richardsever.bsky.social · 08/10/2026

"A question is a short sentence that ends in a question mark". Conference attendee guidance from @wilbanks.bsky.social at #saegeassembly26 that all should observe

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Richard Alexander coined the term "indirect reciprocity" in a book literally called "The biology of *moral* systems". It begins like this: "Moral systems are societies with rules. Rules are agreements or understandings about what is permitted and what is not, [...] about what is right and wrong".

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

I see people being very anti-AI but not so much anti-dictionary. Looking up for words you don't know is also cheating! As it is having another human read your text and suggest improvements! All writing should be done in the dark cell of your boundedly irrational solitude! And by hand! No machines!

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

What do you think about the use of dictionaries in scientific writing?

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Because indirect reciprocity works by linking behavior in specific contexts with reputations ("assessment rules"), and reputations of different actors with behavior ("action rules"), and such rules can be interpreted as stating what is deemed to be good and what is wrong, i.e., moral rules.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Thanks to @jfbonnefon.bsky.social @cmolho.bsky.social @fernandopsantos.bsky.social for feedback and previous interactions that helped shaped the content of this paper. And to @iasamsterdam.bsky.social, where this project started four years ago. Comments are welcome!

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Consistency is a cousin of the golden rule: where the golden rule governs conduct, consistency governs judgment. It asks us to hold others to the standard we keep ourselves, i.e., not to be hypocrites. 📄 arxiv.org/abs/2610.03832 6/6

arxiv.org

Cooperation thrives when moral judgment matches moral conduct

A leading explanation for why humans cooperate with strangers is indirect reciprocity: when conduct is observed, individuals earn good reputations by cooperating with the deserving. Previous research ...

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

This calls for reappraising the "leading eight" moral systems first identified by Ohtsuki & Iwasa (2004). All are stable in prisoner's dilemmas, but only L2 and L6 are consistent. Only L2 (contrite discriminator + Consistent Standing) is stable in every dilemma, making it the "leading one". 5/6

Table of cooperation and stability indices with rare errors, shaded darker for lower values. Top: the four consistent discriminating systems all cooperate fully. Consistent CDISC scores 1 (fully stable) in prisoner's dilemmas, snowdrift games and stag hunts. Consistent DISC scores 2/3 in snowdrift games, and consistent ODISC and PDISC score 2/3 in prisoner's dilemmas. Bottom: the leading eight all score 1 in prisoner's dilemmas. Only L2 (CDISC, Consistent Standing) scores 1 everywhere. L6 scores 2/3 in snowdrift games, and the other six score 0 in snowdrift games, stag hunts or both.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Contrition matters too. The contrite discriminator cooperates to make amends when in bad standing. When errors are rare, it is the only strategy that keeps cooperation stable in every dilemma, provided its norm is consistent. It even invades the standard discriminator in some snowdrift games. 4/6

Zoom on the red cluster of the previous figure: the 1,024 consistent discriminating systems colored by strategy, with cooperation index from 0.88 to 0.94 and stability index from 0.83 to 0.95. The 256 systems using the contrite discriminator (CDISC, pink) form the two highest groups, with L2 at the top, near 0.95. Systems using the other three discriminators (DISC, which includes L6; ODISC; and PDISC) sit lower, between 0.83 and 0.87.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Why consistency? A moral system works by sorting: followers of the strategy are judged good, deviants bad, so cooperation flows to fellow reciprocators. An inconsistent norm judges some deviant good at least as often as residents. Cooperation is then misdirected, and the system can be invaded. 3/6

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

Only 1,024 systems stand out as highly cooperative and highly stable. Each pairs a discriminating strategy (cooperate with the good, defect against the bad) with a consistent norm that deems good exactly the strategy's followers. They practice what they preach, and preach what they practice. 2/6

Scatter plot of all distinct moral systems, with cooperation index (0 to 1) on the horizontal axis and stability index (0 to 1) on the vertical axis. Most systems appear as gray hexagons spread across low to medium stability. A red cluster of 1,024 consistent discriminating systems sits alone in the top-right corner, with high cooperation and stability above 0.8, separated from the rest by a gap. Of the "leading eight" (green diamonds), only L2 and L6 fall in the red cluster; the other six sit lower, at stability between about 0.3 and 0.65.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 08/10/2026

New preprint with Julian Garcia & @tobyhandfield.bsky.social 🧵 We tested 1,048,576 moral systems of indirect reciprocity, each pairing a strategy (how to act) with a social norm (how to judge others), across all prisoner's dilemmas, snowdrift games and stag hunts. arxiv.org/abs/2610.03832 1/6

Model diagram. Two players, each with a good or bad reputation, play a two-by-two game with payoffs R, S, T and P. Each player cooperates or defects according to a strategy table that reads both players' reputations. An observer watches and assigns both players new reputations according to a social norm table that reads both reputations and both actions. Side panels show example strategies (ALLC, ALLD, DISC, CDISC, ODISC, PDISC) and norms (Scoring, Stern Judging, Simple Standing, Standing, Consistent Standing, Generous Standing) as colored grids.

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Reposted by Jorge Peña 🇵🇸

Vincent Heidelberg ↙️↙️↙️ @astrovicnet.bsky.social · 06/10/2026

C'est 9 fois et demi la durée de l'emprisonnement de Sarko pour avoir négocié avec des terroristes pour financer sa campagne, et c'est 6 mois de plus que Marine Le Pen, qui a détourné 4 millions d'euros.

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Charlotte Clymer @charlotteclymer.bsky.social · 07/10/2026

I admit to being rather confused when some folks offer that Andrew Tate should face the death penalty for his sex crimes when it's a well-known fact he was brutally murdered by Greta Thunberg back in 2022.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 07/10/2026

Journals have refused, for decades, to pay human peer reviewers. Now they are okay with paying AI agents to do this job.

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Reposted by Jorge Peña 🇵🇸

Charlotte Cavaille @ccavaille.bsky.social · 05/10/2026

Job alert! More info on how to apply is available in the link shared below. Please help me circulate this information broadly 🙏 (1/2)

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 02/10/2026

.@biorxiv-evobio.bsky.social rejected my last two preprint submissions, arguing that they were not relevant to evolutionary biology (one was published in Theoretical Population Biology, the other is under R&R at Journal of Theoretical Biology). 🫠 So I'm back to submitting preprints to arXiv.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 02/10/2026

Unspoken rule of academia: the moment you hit send to a paper submission, you can stop working and go home.

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Reposted by Jorge Peña 🇵🇸

laurentfranckx.bsky.social @laurentfranckx.bsky.social · 02/10/2026

Your sense of humor may differ from mine but I find this one of the most hilarious jokes I have seen in recent weeks

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 30/09/2026

Not one word. Not one sentence. The whole paragraph was written by AI.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 29/09/2026

Somebody converting from PDF to Word some document I have sent to them, and then sending back to me such Word document with comments, is one of the scariest things of my professional life.

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Reposted by Jorge Peña 🇵🇸

Simon J. Greenhill @simongreenhill.bsky.social · 27/09/2026

…and interdisciplinary people are precisely those who can’t get jobs because “how could you possibly teach intro to X”

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 24/09/2026

What is Southern Europe? Three main lines divide the Europes into two parts: the tomato/potato line, the wine/beer line, the olive oil/butter line. If you are simultaneously on the tomato, wine, and olive oil sides of these lines, you are in Southern Europe. Otherwise, you are in Northern Europe.

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laserhedvig @laserhedvig.bsky.social · 21/09/2026

Interdisciplinary research is great and necessary, and also has consistently lower funding success www.nature.com/articles/nat... #academiclabourmarket #academia #research

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Reposted by Jorge Peña 🇵🇸

Stefan Schoenfelder @stefanschoenfelder.bsky.social · 20/09/2026

The number of MSCA Postdoctoral Fellowship applications in 2026 (21,627) has more than doubled since 2024 (10,360 proposals) and more than tripled since 2022 (7,044). Stating the obvious here but this is not sustainable.

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Reposted by Jorge Peña 🇵🇸

Kieran Healy @kjhealy.co · 18/09/2026

This is the far more likely pathway for how AI will end us all, btw. Not via some superintelligent swarm of paperclip maximizers, but by a cascading sequence of dumb fuckups driven by human beings who have arranged things to be fast-moving and catastrophically fragile while also being really lazy.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 18/09/2026

You can both love and hate art. You can both love and hate science. You can both love and hate AI.

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Per Engzell @pengzell.bsky.social · 18/09/2026

A paper is finished when the embarrassment of submitting it becomes smaller than the embarrassment of still working on it

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Ted McCormick @tedmccormick.bsky.social · 17/09/2026

these people axed their writing center

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 17/09/2026

How do you fight the far right? By confronting the far right, by mocking the far right, by shaming the far right. How do you not fight the far right? By remaining silent and complacent.

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 17/09/2026

Loving what is going on now with Canada and Ed Sheeran. 🍿

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Vaughn Cooper @vscooper.micropopbio.org · 16/09/2026

Authors!🚨 While you scramble for scarce $ 🤔 “Springer Nature reports revenue growth of 6.2%..and adjusted operating profit growth of 7.7%. They reported even more stunning submission growth of 30% and published article growth of 13%.” Publishing in society journals helps YOU not them👇🏻. Pass it on.

static.klipy.com

Man Lying on a Pile of Money

ALT: Man Lying on a Pile of Money

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Jorge Peña 🇵🇸 @jorgeapenas.bsky.social · 16/09/2026

First they steal most of the Parthenon, then they have one of their mathematicians disprove the clever use of geometry of ancient Greek architects. www.theguardian.com/science/2026...

theguardian.com

UK mathematician debunks myth around Parthenon’s optical illusions

Study challenges belief that temple’s curves were designed to correct optical illusions that would have ruined its clean lines

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