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Tal Korem

@tkorem.bsky.social
560 followers 444 following 82 posts

Microbiome, metagenomics, ML, and reproductive health. All views are mine. So are all your base

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Reposted by Tal Korem
Sarah Andersen @sarahseeandersen.bsky.social · 19/09/2026
The image is of a four panel comic.
The first panel shows a brain. The brain is saying "I'm 30 and YOUNG! I only recently fully developed!"
The second panel shows a heart. The heart says "I hear ya! I can keep going for DECADES more!"
The third panel shows a spine's face. It weakly says, "I am old".
We zoom out and the spine is using a walker. It continues, "so very old".
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Reposted by Tal Korem
Will McKinley @willmckinley.bsky.social · 26/08/2026
"It's given a lot of people permission to be themselves, to not dream it, be it, which is the motto of the movie, really. I would like to be remembered for that." Farewell to Tim Curry (1946-2026) #RIP
Tim in costume as Dr. Frank-N-Furter
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Reposted by Tal Korem
Smooth Dunk @smoothdunk2.bsky.social · 05/08/2026
4 panel comic

Panel 1:
A post from “kavishj9611” that reads: 

“All the people who are anti-Al or want to slow Al progress, I have one question:
If Al disappeared tomorrow, could you still get through an entire workday without ChatGPT, Claude, or any other
Al tool?
Imagine Al was suddenly banned.
Would you actually be willing to give it up?”

Panel 2:
And Orange Guy and a Pink Guy are standing in a room that has two pipes in it. Both pipes are pumping raw sewage into the room. The characters are waist deep in it.
Orange Guy says smugly “Ok Mr “I don’t want to be in a room that’s filling up with raw sewage” let me ask you this”

Panel 3:
The sewage has reached their chests. Pink Guy is gagging. Orange Guy smugly continues “If all this sewage disappeared right now, could you get through the day without it?”

Panel 4:
The sewage is almost up to their eyeballs. Orange Guys says “Look at that shit floating past your face. Are you willing to give that up?”
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Reposted by Tal Korem
Amy D Willis @amydwillis.bsky.social · 25/06/2026
I'm hiring a #postdoc 🥳 and applications are open 🤩 Candidates with interests in EITHER statistical methodology or microbial ecology / microbiome are welcome to apply. The position / projects will be tailored to the candidate 🌟📈🎤 Thank you for sharing widely! apply.interfolio.com/188571
apply.interfolio.com
Apply - Interfolio {{$ctrl.$state.data.pageTitle}} - Apply - Interfolio
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Reposted by Tal Korem
Marisa Kabas @marisakabas.bsky.social · 19/05/2026
this is a masterpiece
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A. Murat Eren (Meren) @merenbey.bsky.social · 16/04/2026
How every layer of science's "self-correcting machinery" failed when Iva Veseli and I simply wanted to reproduce the findings of a high-profile study on gut microbiome and autism: merenlab.org/2026/04/15/u...
merenlab.org
Unfalsifiable by Design: A Year of Trying and Failing to Reproduce a Human Microbiome and Autism Study
The myth of open data, reproducibility, responsibility, and accountability in science, and your role in it
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Alex Crits-Christoph @acritschristoph.bsky.social · 14/04/2026
Absolute banger: "find that metaSPAdes consistently outperforms MEGAHIT" "Binning refinement, which combines bins from multiple different algorithms, leads to reduced performance" "We further show that CheckM2 systematically overestimates completeness and underestimates contamination"
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Sebastian Schmidt @tsbschm.bsky.social · 14/04/2026
This simulation-cum-benchmark study on MAG making by @tkorem.bsky.social & team looks really interesting. Loads of plots and results to work through! www.biorxiv.org/content/10.6...
biorxiv.org
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J. L. Westover @mrlovenstein.bsky.social · 09/04/2026
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Seth Rosenthal @sethrosenthal.bsky.social · 31/03/2026
i've yet to see evidence that this man is anything other than the fucking coolest to ever do it
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Michael Baym @baym.lol · 03/02/2026
The truly visionary thing for Simons to do would be to map the collaboration graph of submitted proposals, find the bridges between large connected components, and offer them unrestricted awards
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Reposted by Tal Korem
Prof Peter Hotez MD PhD DSc(hon) @peterhotezmdphd.bsky.social · 11/01/2026
Schopenhauer
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Dave Levitan @davelevitan.bsky.social · 23/12/2025
Pollution dropping by that much likely means a whole bunch of people are alive who otherwise wouldn’t be. Incredible stuff.
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Amir Mitchell @amitchell.bsky.social · 17/12/2025
We just published in @molsystbiol.org with the Mugler lab (UPitt) on bacterial population dynamics during tumor colonization (mouse model). Our study was guided by a Luria–Delbrück-style idea: infer mechanism from statistics (1/7) 🧪🦠 doi.org/10.1038/s443...
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Reposted by Tal Korem
Tal Korem @tkorem.bsky.social · 28/11/2025
Out after peer-review: www.science.org/doi/full/10.... Our bottom line stayed: never use leave-one-out cross-validation as it has inherent train-test leakage. Consider our Rebalanced version instead! We now also account for regression and nested cross-validation, with more extensive benchmarking.
science.org
Distributional bias compromises leave-one-out cross-validation
Leave-one-out cross-validation, a common machine learning evaluation method, has a pernicious flaw; a practical fix is presented.
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Reposted by Tal Korem
AnniZLab: [🦠, 🧬 , ✨] @annizlab.bsky.social · 29/11/2025
Using leave-one-out cross-validation to calculate metrics such as AUC and R^2 creates bias! This can be fixed by removing one of each class in the meanwhile to maintain the training data distribution - great work by Tal and his team 🧪🧬🖥️
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Emil Privér @priver.dev · 01/10/2025
I found a flowchart which helps you navigate the IT landscape
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Mike Feigin 🥯 @mikefeigin.bsky.social · 29/11/2025
Back when we hid beer in the cold room in a box labeled “yeast embryos.”
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Tal Korem @tkorem.bsky.social · 28/11/2025
Out after peer-review: www.science.org/doi/full/10.... Our bottom line stayed: never use leave-one-out cross-validation as it has inherent train-test leakage. Consider our Rebalanced version instead! We now also account for regression and nested cross-validation, with more extensive benchmarking.
science.org
Distributional bias compromises leave-one-out cross-validation
Leave-one-out cross-validation, a common machine learning evaluation method, has a pernicious flaw; a practical fix is presented.
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Reposted by Tal Korem
Ashton Pittman @ashtonpittman.bsky.social · 13/11/2025
"This could take down Democrats, too." I know. And I frankly wouldn't give even an itty bitty damn if it implicated every Democratic man in Congress, every Democratic hopeful for 2028 and every Democrat who has even thought about running for office. Down with the sex predators, wherever they are.
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Mohammed AlQuraishi @moalquraishi.bsky.social · 28/10/2025
White paper: github.com/aqlaboratory... GitHub Repo: github.com/aqlaboratory... Huggingface: huggingface.co/OpenFold/Ope... Testimonials: openfold.ghost.io/openfold3-co...
github.com
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Mohammed AlQuraishi @moalquraishi.bsky.social · 28/10/2025
OpenFold3-preview (OF3p) is out: a sneak peek of our AF3-based structure prediction model. Our aim for OF3 is full AF3-parity for every modality. We now believe we have a clear path towards this goal and are releasing OF3p to enable building in the OF3 ecosystem. More👇
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Joe Bak-Coleman @jbakcoleman.bsky.social · 17/10/2025
Just to be super clear, if you’re phoning in your peer review to ai you should quit your job so someone else who actually likes science can have it.
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Tal Korem @tkorem.bsky.social · 16/08/2025
I never knew I needed this thread
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Tal Korem @tkorem.bsky.social · 07/08/2025
We are hiring a postdoc - come work with us (www.koremlab.science) at the intersection of #microbiome, data science, and women's health! Message or email me if interested. 🖥️ 🧬
koremlab.science
Korem Lab - Microbiome Systems Biology @ Columbia | New York, USA
We apply systems biology approaches to decipher the metabolic interactions between the microbiome and its human host in diverse clinical settings, aiming towards personalized microbiome-based therapeu...
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Reposted by Tal Korem
Nandita Garud @nanditagarud.bsky.social · 22/07/2025
I am seeking a postdoc for my group at UCLA. We work at the intersection of population genetics x microbiome (garud.eeb.ucla.edu). If interested, please message me!
garud.eeb.ucla.edu
Garud Lab
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Reposted by Tal Korem
Noah Fierer @noahfierer.bsky.social · 21/06/2025
Hope this is useful - consensus statement "Guidelines for preventing and reporting contamination in low-biomass microbiome studies" rdcu.be/er3Io
rdcu.be
Guidelines for preventing and reporting contamination in low-biomass microbiome studies
Nature Microbiology - In this Consensus Statement, the authors outline strategies for processing, analysing and interpreting low-biomass microbiome samples, and provide recommendations to minimize...
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Reposted by Tal Korem
Erin Biba @erinbiba.bsky.social · 25/05/2025
The trolley problem graphic where one side is several people tied to the train tracks except the other side has no one on the tracks. A man is standing holding a lever trying to decide which track the trolley should take. The text reads “You can pull the lever, but to do so you must wear a mask at the grocery store.”
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Reposted by Tal Korem
Timothy McBride @mcbridetd.bsky.social · 22/05/2025
Not getting much attention, except in a recent NYTimes story, is a provision to increase the tax on university endowments and those of other nonprofits.
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Reposted by Tal Korem
Justin Silverman @inschool4life.bsky.social · 22/05/2025
New paper in Genome Biology! genomebiology.biomedcentral.com/articles/10.... We introduce scale models, a generalization of normalizations that explciitly account for uncertainty in biological system scale (e.g., microbial load).
genomebiology.biomedcentral.com
Incorporating scale uncertainty in microbiome and gene expression analysis as an extension of normalization - Genome Biology
Statistical normalizations are used in differential analyses to address sample-to-sample variation in sequencing depth. Yet normalizations make strong, implicit assumptions about the scale of biologic...
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Reposted by Tal Korem
daniel sieradski @self.agency · 18/05/2025
as a resident of syracuse, ny, a rust belt town that used to be an economic epicenter for the nation: syracuse university is our largest local employer now and if it goes under, so does my town, which has the largest concentration of child poverty in the nation.
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Lynn Jolicoeur @lynnjolicoeur.bsky.social · 16/05/2025
"I'm still in shock. I know that there have been political issues around Harvard in recent weeks, but antibiotic resistance isn't one of them." My conversation with Harvard microbiologist @baym.lol, one of many researchers there who just lost millions in fed. grants. www.wbur.org/news/2025/05...
wbur.org
Antibiotic research at Harvard lab threatened by federal funding cuts
Microbiologist Michael Baym studies antibiotic resistance at Harvard Medical School. He lost millions in federal funding this week.
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Reposted by Tal Korem
Tal Korem @tkorem.bsky.social · 02/05/2025
Our paper explaining why Gihawi et al. failed to prove an error in the normalization used by the 2020 cancer #microbiome analysis now out as a Matters Arising in @asm.org #mSystems (w/ @george-austin.bsky.social) 🖥️ 🧬 Thread explaining the key points below. journals.asm.org/doi/10.1128/...
journals.asm.org
Compositional transformations can reasonably introduce phenotype-associated values into sparse features | mSystems
Gihawi et al. claim that finding that a transformation turned highly sparse (mostly zero) features into features that are associated with a phenotype is sufficient to conclude that there is informatio...
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Tal Korem @tkorem.bsky.social · 02/05/2025
Our paper explaining why Gihawi et al. failed to prove an error in the normalization used by the 2020 cancer #microbiome analysis now out as a Matters Arising in @asm.org #mSystems (w/ @george-austin.bsky.social) 🖥️ 🧬 Thread explaining the key points below. journals.asm.org/doi/10.1128/...
journals.asm.org
Compositional transformations can reasonably introduce phenotype-associated values into sparse features | mSystems
Gihawi et al. claim that finding that a transformation turned highly sparse (mostly zero) features into features that are associated with a phenotype is sufficient to conclude that there is informatio...
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Reposted by Tal Korem
Emily White @emily-white.bsky.social · 11/04/2025
Come and work with me! The Nature Micro team is expanding and we're looking for someone to champion microbial ecology, plant micro & related areas for the journal Knowledge of microbial ecology/plant micro is desirable but we're open to applications from all microbiologists Link below 👇
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Nature Microbiology @natmicrobiol.nature.com · 27/03/2025
OUT NOW: Processing-bias correction with DEBIAS-M improves cross-study generalization of microbiome-based prediction models @tkorem.bsky.social & co #microsky #microbiomesky 🧪 www.nature.com/articles/s41...
nature.com
Processing-bias correction with DEBIAS-M improves cross-study generalization of microbiome-based prediction models - Nature Microbiology
DEBIAS-M corrects technical variability in microbiome data in a manner both interpretable and suitable for machine learning. In extensive benchmarks, DEBIAS-M facilitates robust analyses that generali...
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Tal Korem @tkorem.bsky.social · 27/03/2025
Happy to share DEBIAS-M, our new method for domain adaptation and bias correction in #microbiome data.🧬🖥️ Microbiome data is very variable, with substantial study- and batch-effects. DEBIAS-M corrects these, enabling robust and generalizable analyses. A quick thread: www.nature.com/articles/s41...
nature.com
Processing-bias correction with DEBIAS-M improves cross-study generalization of microbiome-based prediction models - Nature Microbiology
DEBIAS-M corrects technical variability in microbiome data in a manner both interpretable and suitable for machine learning. In extensive benchmarks, DEBIAS-M facilitates robust analyses that generali...
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Mike Feigin 🥯 @mikefeigin.bsky.social · 11/03/2025
Just let me try and cure cancer for fucks sake.
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Annika Barber @annikabarber.bsky.social · 23/01/2025
Whomst among ass profs is not tired of Unprecedented Times? I want a precedent of faculty position straight from PhD and uninterrupted federal science funding for a 50 year career pls.
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Xi Fu @fuxialexander.bsky.social · 08/01/2025
GET is finally published! - Paper: t.ly/iQct_ (new validations, dry and wet) - Model: t.ly/4jnUI (new tutorial on PBMC 10x Multiome data, and yes you can even fine-tune it on a Macbook) - Analysis package: t.ly/OqLAL - Demo: t.ly/rbFQB - Docker: t.ly/86n_i
t.ly
A foundation model of transcription across human cell types - Nature
A foundation model learns transcriptional regulatory syntax from chromatin accessibility and sequence data across a range of cell types to predict gene expression and transcription factor interactions...
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Tal Korem @tkorem.bsky.social · 22/12/2024
Now out "in print": we review domain adaptation methods, along with gaps and considerations for datasets of "biological scale" (many features, few samples, etc.). A fun CIFAR-funded collaboration with @meganakpeters.bsky.social 🧬 🖥️ www.science.org/doi/full/10....
science.org
Domain adaptation in small-scale and heterogeneous biological datasets
Research using biological data can benefit from domain adaptation modeling approaches, but it also carries distinct challenges.
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Prachee Avasthi @pracheeac.bsky.social · 18/12/2024
• Author accepted manuscripts (peer reviewed articles) must be made available in Pubmed Central WITHOUT EMBARGO upon the official date of publication. • Policy effective date is Dec 31, 2025 (no end date).
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Tal Korem @tkorem.bsky.social · 04/12/2024
Probably an unpopular opinion, but I’ve seen it advertised recently so a warning: I believe that junior group leader positions are typically a bad career move.
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Tal Korem @tkorem.bsky.social · 26/11/2024
I hope events over the past month demonstrate once and for all that especially in such challenging times men are just too emotionally volatile to be allowed to vote
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Emily Davenport @erdavenport.bsky.social · 04/11/2024
Thrilled to share our paper on differences in oral microbiome composition across subsistence strategies in Nepal is now out in Microbiome: link.springer.com/article/10.1...
link.springer.com
Nepali oral microbiomes reflect a gradient of lifestyles from traditional to industrialized - Microbiome
Background Lifestyle plays an important role in shaping the gut microbiome. However, its contributions to the oral microbiome remain less clear, due to the confounding effects of geography and methodo...
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Tal Korem @tkorem.bsky.social · 28/10/2024
This age of publicly funded and highly valued pursuit of scientific knowledge is an outlying bleep in human history. Could (and the way things are going, would) change before we know it
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Tal Korem @tkorem.bsky.social · 13/09/2024
An absolute game-changer for my / students' grant writing.
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Tal Korem @tkorem.bsky.social · 28/08/2024
It's been a rough year for low-biomass microbiome research - but we've also learned a lot, and the challenges are surmountable. Here, we discuss how proactive study design and careful data analysis can help. 🖥️ 🧬 #microbiome academic.oup.com/jid/advance-...
academic.oup.com
Planning and Analyzing a Low-Biomass Microbiome Study: A Data Analysis Perspective
Low-biomass microbiome studies show great potential alongside major controversies. This review surveys key methodological challenges and discusses experime
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Tal Korem @tkorem.bsky.social · 11/06/2024
New preprint! In a few words: we don't think you should use leave-one-out cross-validation (LOOCV). In a lot of words (+RebalancedCV, a LOOCV alternative): arxiv.org/abs/2406.01652 In a thread:
arxiv.org
Distributional bias compromises leave-one-out cross-validation
Cross-validation is a common method for estimating the predictive performance of machine learning models. In a data-scarce regime, where one typically wishes to maximize the number of instances...
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Tal Korem @tkorem.bsky.social · 15/05/2024
Very apt sequence from the other place ( @baym.lol )
A tweet from Michael Baym saying: "The depth of burnout I feel doing anything remotely grant-related is starting to make me question whether I'm actually cut out to be a PI" Followed by a tweet by Michael Eisen saying "It's the hope that kills you"
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