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Kalle Leppälä

@kallelep.bsky.social
181 followers 181 following 119 posts

Maybe it's just a science account? Then it's math and genetics.

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Reposted by Kalle Leppälä
Rebecca Sear @rebeccasear.bsky.social · 19/09/2026
If you read the replies you’ll see that Pinker was always a race science supporter, it’s just that nobody paid any attention. Maybe we should start noticing when celebrity scientists are fans of pseudoscientific ideas, and adjust our opinion of their competence accordingly
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Quentin André @quentinandre.bsky.social · 08/09/2026
Hilarious stuff from hypocrite-in-chief Bill Ackman, currently bankrolling Francesca Gino, who has *check notes* sued three brave scholars for telling the truth.
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Nvidie @dervine7.bsky.social · 06/09/2026
there’s actual policy based on his (allegedly) faked data! there was a primetime crime drama where the lead character was based *on him*!
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Nicholas Grossman @nicholasgrossman.bsky.social · 28/08/2026
In the context of the Trump regime’s assaults on academic freedom and free speech, this means official U.S. policy is that race science is one of the very few things it’s acceptable to do at a university, and must be promoted by the state, while most other pursuits should be crushed by the state.
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Jon Phillips @jowiph.bsky.social · 27/08/2026
Academic freedom is when a foreign government dictates how and even whether a university investigates misconduct
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Bird account @dialecticbio.bsky.social · 23/08/2026
There's this cute doublespeak race realists do where, on one hand, universities must be the most ELITE MERITOCRACY (so no Blacks!). But when their favourite phrenologist gets suspended for being bad at their job, suddenly it's all "universities should be an adult kindergarten for free expression"
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Kalle Leppälä @kallelep.bsky.social · 24/08/2026
The focus regarding the Cofnas affair should honestly shift to the fact that the US ambassador dares to intervene. That's simply outrageous, keep the words "academic freedom" out of your mouth if you don't see that.
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Reposted by Kalle Leppälä
Carl T. Bergstrom @carlbergstrom.com · 24/08/2026
If you just happened to pick this week to start yelling about the importance of academic freedom, I sure hope you did more than watch silently for the past 18 months as the Trump administration assaulted everything from mRNA vaccine research to gender studies to the very idea of having universities.
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Peter @notalawyer.bsky.social · 23/08/2026
“if we don’t stand up for the free speech of racists, it puts everyone’s free speech in danger.” - guy who only ever talks about free speech when it’s racism
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shaunt @shaunvids.bsky.social · 23/08/2026
basically the whole war on science crew signed the cofnas support letter. always the same group of bigoted pricks
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Nate O @nateo.bsky.social · 21/08/2026
In the UK, there has been an almost universal memory-holeing of how Toby Young was personally invited to a secret, exclusive eugenics conference full of white supremacists spreading racist pseudo-science, then he disappeared, and reappared, founded the FSU and then became a life peer
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Peter @notalawyer.bsky.social · 22/08/2026
look at how seamlessly they transitioned from “we must evaluate Arday’s life and work no matter the motives of his critics” to the opposite position: defending Cofnas because of his critics’ motivations, no matter the quality of his work
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Pieter T. L. Beck @ptrbck.bsky.social · 13/03/2026
Nathan Cofnas was hired by my colleague Bouke De Vries, who attended the 2024 London Conference on Intelligence alongside Edward Dutton and Emil Kirkegaard. With more than 400 colleagues, I signed an open email to the rector to argue why we think this is problematic. www.vrt.be/vrtnws/en/20...
vrt.be
Appointment of controversial “race researcher” questioned by 300 staff and students at Ghent University | VRT NWS: news
300 staff and students are asking Ghent University to reconsider the appointment of a controversial American researcher. ‘The man spreads racist ideas, which is contrary to Ghent University's code of ...
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Sunder Katwala (sundersays) @sundersays.bsky.social · 21/08/2026
To say Cofnas was "sacked" at Cambridge over-simplifies. He was *employed* by Uni on a 3 year appointment, at philoaophy dept, with suppprt from Leverhulme. He completed those 3 years & left at end. But he was removed from an unpaid College Research Associste link with Emmanuel College during it
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Sunder Katwala (sundersays) @sundersays.bsky.social · 20/08/2026
"The College would not associate itself with an astronomer who believed that the sun orbited the earth, or a medic who believed scrofula could be cured by the touch of a king. The claim black people are only fit to be sports stars and entertainers has no more validity that these beliefs’ - a student
‘Mr Cofnas is entitled, I suppose, to think that black people are inferior to white people and to
express his views online. But this does not mean that those views should be given any
endorsement by the College. Any relationship with the College would suggest that the College
felt that such views had sufficient weight to be worthy of debate. Not all views are worthy of
debate or protection on the grounds of freedom of speech. The College would not associate
itself with an astronomer who believed that the sun orbited the earth, or a medic who believed
that scrofula could be cured by the touch of a king. The claim that black people are only fit to
be sports stars and entertainers has no more validity that these beliefs.
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Kalle Leppälä @kallelep.bsky.social · 20/08/2026
It should be obvious to any thinking person that Cofnas was hired because he's a racist, not despite being a racist. www.thecanary.co/skwawkbox/20...
thecanary.co
EXCLUSIVE: "shoddy" Cofnas was unfit for his Uni job say colleagues - months before Arday attack
Uni academics said in leaked emails that even Cofnas's presence detracts from their work, because they had to counter the 'flood of shit'
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Reposted by Kalle Leppälä
Gregory Kohn @kohngregory.bsky.social · 15/08/2026
In the wake of Arday's death, Nathan Cofnas (who led the X mob against him) states his motivation. Beyond whistleblowing, he states that after a 'revolution' removes professors like Arday, it will open opportunities for him to become 'head of the department of eugenics and race science at Harvard'.
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Kalle Leppälä @kallelep.bsky.social · 13/02/2026
My article "Unknown Title" has so profoundly impressed a publishing house that they're inviting me to write a book on tensor methods 🤩
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Reposted by Kalle Leppälä
Kevin Bird @stairwaytokevin.bsky.social · 24/01/2026
An excellent, bone-chilling story about a cadre of online racists who stole genetic data from studies on children so they could make specious arguments for the innate inferiority of non-white people, it's embrace by Elon Musk/twitter & how the Trump administration might make it easier to do again.
nytimes.com
Genetic Data From Over 20,000 U.S. Children Misused for ‘Race Science’
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Gen Wojcik @genandgenes.bsky.social · 24/01/2026
Incredibly important story that everyone should read. These are not disorganized lone actors, but well-funded and powerful networks to be treated as serious threats. They are using our work to push a eugenicist and racist agenda that is scientifically invalid and morally reprehensible.
nytimes.com
Genetic Data From Over 20,000 U.S. Children Misused for ‘Race Science’
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Gregory Kohn @kohngregory.bsky.social · 24/01/2026
Great piece in the NYtimes with quotes from @stairwaytokevin.bsky.social and @sashagusevposts.bsky.social. The misuse of NIH datasets with sensitive personal information for racist aims should be concerning for anybody interested in scientific integrity. www.nytimes.com/2026/01/24/u...
nytimes.com
Genetic Data From Over 20,000 U.S. Children Misused for ‘Race Science’
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Kalle Leppälä @kallelep.bsky.social · 27/12/2025
Here's a new manuscript I wrote about unrooted f4-ratio estimation. The fact that an unrooted version of the method works is not novel, but I propose it's not widely known and I present some applications that will hopefully be found interesting. www.biorxiv.org/cgi/content/...
biorxiv.org
Notes on f4-ratio estimation
The f4-ratio estimation is a popular technique for estimating gene flow proportion as a ratio between two f4 -statistics. We point out the underappreciated fact that the root is not important in f4 -r...
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Reposted by Kalle Leppälä
Sasha Gusev @sashagusevposts.bsky.social · 13/12/2025
I wrote about the bizarre case of Herasight, the embryo selection company going all in on eugenics.
open.substack.com
Embryo selection company Herasight goes all in on eugenics
...
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Kalle Leppälä @kallelep.bsky.social · 12/12/2025
All right, so Graham Hancock is on Colossal's cultural advisory board. What a serious company, what a serious country, what a serious timeline!
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Chris S @stylistic.bsky.social · 30/11/2025
Remember when it was imperative that we take Haidt seriously?
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cyber professional @permadeath.com · 28/11/2025
was idly curious if you could get a 2d6 probability curve as a single die and the answer is: yes, it's a "hendecahedron" that looks like this, and they work when 3D printed hbaktash.github.io/projects/put...
12 • Baktash, Sharp, Zhou, Crane, and Jacobson
Initial Shape Initial
MS Complex Optimized Shape Optimized
MS Complex
Fig. 14. A variety of dice representing the distribution of the sum of two
six-sided dice are shown, all starting from different polygonal shapes with
11 faces. The first and second rows use the same initial shape but different probability assignments to faces. In all these examples, the goal is to
keep all faces stable and polygonal faces planar. Outcome of the optimized
shapes are engraved on corresponding faces in a post-process.The dice energy parameters used for these shapes, (𝜆𝑐𝑙, 𝜆𝑏𝑐, 𝜆𝑛𝑏 ), from top to bottom:
(1, 0.1, 1), (0.8, 0.01, 0.8), (0.2, 2, 0.2).
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Rebecca Sear @rebeccasear.bsky.social · 26/11/2025
Retraction Watch has covered the problem of the “national IQ” database. Should be noted I’m far from alone in working to remove these publications. The spreadsheet of pubs which use NIQ - linked to in the article - was started by @kohngregory.bsky.social; a project also worked on by Cathryn Townsend
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Kalle Leppälä @kallelep.bsky.social · 26/11/2025
The probability that a schizophrenic's polygenic score for schizophrenia is in the highest percentile is about 1.1%. The probability that Hitler's (not even schizophrenic) polygenic scores for schizophrenia, autism and bipolar are in the highest percentile each is about 0.0%.
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Reposted by Kalle Leppälä
David Wearing @davidwearing.bsky.social · 20/10/2025
The entire "free speech on campus" moral panic was manufactured to blackmail us into making space in intellectual life for bigots and charlatans who couldn't get there on their own merits. Its a DEI scheme for fascism. Congratulations to everyone who took it at face value.
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Kalle Leppälä @kallelep.bsky.social · 06/10/2025
I use Google Scholar to fetch BibTeX form citation information of articles and books, but it's not really great that capital letters in titles are not protected with curly braces, and LaTeX then renders something like genus names or "D-statistic" lower case. Come on 😤
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Christopher Mathias @letsgomathias.bsky.social · 14/09/2025
Last year: Austin Peay State University learns prof is Nazi who went to Charlottesville rally. Admin drags heels, pays him $56k severance to leave This week: APSU prof posts screenshot of headline - Charlie Kirk Says Gun Deaths ‘Unfortunately’ Worth it to Keep 2nd Amendment- & is immediately fired
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Nic Rawlence @nicrawlencenz.bsky.social · 31/07/2025
Thanks @newscientist.com for shining a light on the smear campaign against @toriherridge.bsky.social, @devoevomed.bsky.social, @flintdibble.bsky.social & myself just for fulfilling our critic & conscience role to provide expert commentary about de-extinction www.newscientist.com/article/2490...
newscientist.com
Critics of de-extinction research hit by mystery smear campaign
Several researchers who have been critical of Colossal Biosciences’ plans to revive extinct animals say they have been targeted by online articles trying to discredit them
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Mother Jones @motherjones.com · 17/07/2025
After he leaked Zohran Mamdani's Columbia application data to the New York Times, critics called Jordan Lasker a "eugenicist." A Mother Jones report shows there's much more to his backstory. Read @nlanard.bsky.social on the shocking rise of one of the tech-right’s favorite posters.
motherjones.com
The shocking rise of one of the tech-right’s favorite posters
After he leaked Zohran Mamdani's Columbia application data to the New York Times, critics called Jordan Lasker a "eugenicist." A Mother Jones report shows there's much more to his backstory.
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Kevin Bird @stairwaytokevin.bsky.social · 09/07/2025
In a long, whiny post about a recent Atlantic article about him, white supremacist Jordan Lasker posts an incompetent analysis using the Adolescent Brain Cognitive Development (ABCD) study dataset that appears to have been illegitimately accessed and then stolen by one of his coauthors.
Crémieux
@cremieuxrecueil
Follow
The Atlantic (@TheAtlantic) does not seem to have fact-checkers, or at least they're very lazy and perhaps incompetent.
Brieflv…Four panel plot showing two distributions for white and black populations alleging for A) additive genetics, B) shared environment, C) nonshared environment, and D) IQ scores
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Ari Pekka Mähönen @apmahonen.bsky.social · 02/07/2025
How plants sense injury in their barrier tissue, periderm? Painstakingly detailed and amazing work by post doc Hiroyuki Iida shows that wounding is sensed by the diffusion of two gases: ethylene and oxygen. @treebiocoe.bsky.social‬ @erc.europa.eu‬ 1/x 🧵 www.nature.com/articles/s41...
nature.com
Plants monitor the integrity of their barrier by sensing gas diffusion - Nature
A study using Arabidopsis shows that plants can monitor the integrity of their outer barriers by sensing gas diffusion, enabling them to initiate wound repair to prevent water loss and pathogen entry.
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Laurits Skov @lauritsskov.bsky.social · 05/05/2025
We ( @zeniabaek.bsky.social @moicoll.bsky.social and @asgerhobolth.bsky.social ) present a new cool way to visualize the optimal trade off for hmm decoding called Artemis plots! arxiv.org/pdf/2504.15156 www.biorxiv.org/content/10.1...
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Carl Zimmer @carlzimmer.com · 17/04/2025
Patenting de-extinction. Story by @antonioregalado.bsky.social www.technologyreview.com/2025/04/16/1...
technologyreview.com
Jurassic Patent: How Colossal Biosciences is attempting to own the “woolly mammoth”
The company claiming it can restore lost species also wants to patent them.
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Kalle Leppälä @kallelep.bsky.social · 12/04/2025
If someone tried to convince me that 14 edits to gray wolf genome makes the animal functionally dire wolf, I'd probably ask for a positive control: turn the wolf functionally jackal with just 14 edits. An easier task, and we at least know what jackals look like and how they act.
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Kalle Leppälä @kallelep.bsky.social · 09/04/2025
My new preprint: When R ~ B(n, p) and n/k -> b > 0, then the k:th raw moment of R is asymptotically k^k (Psi +/- epsilon)^k. Earlier only upper and lower bounds of Psi existed, and a recent sharp result when n/k -> infinity. TODO: the case n/k -> 0. arxiv.org/abs/2504.05766
arxiv.org
On raw moments of the binomial distribution
We study the $k$:th raw moment of a variable $R$ following the binomial distribution $\text{B}(n, p)$, where $n/k \rightarrow β> 0$. It is known that $\mathbb{E}(R^k)$ is bounded both from below and f...
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Kalle Leppälä @kallelep.bsky.social · 03/04/2025
New paper out: academic.oup.com/genetics/adv...
academic.oup.com
Posterior estimation of longitudinal variance components from nonlongitudinal data using Bayesian Gaussian process model
Abstract. Many quantitative traits can be measured from a single individual only once, making acquisition of longitudinal data impossible. In this paper, w
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Bird account @dialecticbio.bsky.social · 03/03/2025
It's finally official and verified: The X user "Cremieux" is ID'd as a guy called Jordan Lasker. Lasker has been LARPing as an expert in genetics on X to promote racist pseudoscience. @sashagusevposts.bsky.social has been calling out his bullshit for ages
Jordan Lasker, AKA ‘Cremieux’
One of the speakers at the conference is billed under a social media alias, Cremieux, but the Guardian has corroborated that the account is apparently run by Jordan Lasker, a long-time proponent of eugenics.

The @cremieuxrecueil X account has been boosted or engaged with dozens of times by that platform’s proprietor, Elon Musk, often on the topic of falling birthrates.
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Cat T @cattownsend.bsky.social · 03/03/2025
So it’s finally in the public domain that the eugenicist Twitter account ‘Cremieux’ is Jordan Lasker. Also these people keep using public universities to incubate eugenics ideology. It’s disgusting.
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Kevin Bird @stairwaytokevin.bsky.social · 03/03/2025
So weird & inscrutable that Musk & his core ideology keeps having strong connections to eugenics & race science, including the pseudonymous race science account Cremieux revealed to be ran by Jordan Lasker whose race science paper was at the center of a scandal involving NIH data misuse & deception
theguardian.com
US natalist conference to host race-science promoters and eugenicists
Details emerge about Natal conference in Austin later this month, set to feature figures linked to far-right politics
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Kevin Bird @stairwaytokevin.bsky.social · 13/12/2024
Three cheers for the death of one of the last bastions of race science! (archive link so you don’t give them clicks) web.archive.org/web/20241213...
web.archive.org
Mass resignations at the journal Intelligence
Numerous members of the editorial board resign after publisher installs new editors-in-chief.
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Rebecca Sear @rebeccasear.bsky.social · 14/12/2024
The flat-earth paper argues that people who live further from Africa are more intelligent, but the method used to measure distance from Africa assumes the earth is flat. When this error was pointed out, nothing was done because it was a “nit-picking” criticism www.frontiersin.org/journals/com...
frontiersin.org
Frontiers | Letting the daylight in: Reviewing the reviewers and other ways to maximize transparency in science
With the emergence of online publishing, opportunities to maximize transparency of scientific research have grown considerably. However, these possibilities ...
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Laurits Skov @lauritsskov.bsky.social · 02/12/2024
Very excited (and a bit nervous) to announce that I will be hiring two Postdocs for my new group(!) in Copenhagen to study the Neanderthal and Denisovan DNA which survives in present-day humans. Retweet will be much appreciated :) Link for application: candidate.hr-manager.net/ApplicationI...
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Victor A. Albert @plantgenomes.bsky.social · 23/11/2024
Final text and PDF of our new approach - Delta-statistics - to detecting directionality of admixture (introgression, hybridization) between species/populations - empirical example reanalyzes gene flow between polar and brown bears academic.oup.com/mbe/article/...
academic.oup.com
Five-leaf Generalizations of the D-statistic Reveal the Directionality of Admixture
Abstract. Over the past 15 years, the D-statistic, a four-taxon test for organismal admixture (hybridization, or introgression) which incorporates single n
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Carl T. Bergstrom @carlbergstrom.com · 22/11/2024
When I was 5, I loved science, which I took to be planets and magnets and chemicals and shit. Soon I realized science was a collective human activity, and these were just the objects of its attention. Anyway, whenever I read an OpEd on how science isn't political, I think "Are you 5 years old?"
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Kalle Leppälä @kallelep.bsky.social · 14/11/2024
A new/old paper of mine just published in Annales Fennici Mathematici. I show that you can almost always row-scale a rectangular matrix so that if you were to orthonormalize the columns, the rows would attain equal Euclidean lengths in the process. afm.journal.fi/article/view...
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