It was a pleasure to visit the European Commission's Directorate-General for Competition and present our work (joint with @sarafish.bsky.social and @ranshorrer.bsky.social) on economic behavior of Large Language Models and algorithmic collusion in particular. 1/2 #econsky

🧪Join us for Physics 101 through the magnificent colors of the aurora: ✨🎨 www.lbscience.org/en/2026/03/0... @lbscience.org

🧪How is cutting edge biotech being used to conserve endangered species? 🦏 A family visit to the @sandiegozoo.bsky.social and a tour of their “frozen zoo” sparked inspiration for my latest article on @lbscience.org www.lbscience.org/en/2026/02/2...

Explaining Superbowl commercials to kids is quite a teaching moment. "No, this car doesn't turn into a robot. This commercial tries to make people buy the car because in the commercial it seems like it turns into a robot, even though if you buy it, it won't. Silly, huh?"

And another hurray! In another wonderful decision, Ariel Procaccia elected fellow of the @acm.org! Ariel isn't just a wonderful researcher with impeccable taste, but is also such a kind colleague and mentor. Tis a day of celebration for the @acmsigecom.bsky.social community and beyond!

Hurray! Noam Nisan elected fellow of the @acm.org! So well deserved. A wonderful teacher, mentor, researcher, and person. A source of pride for us his students, for the @acmsigecom.bsky.social and SIGACT communities, and for all of CS! Congrats to the ACM for having Noam as their fellow.

Finally

🧪What if people living with diabetes could say goodbye to needles, and get their insulin by using an ointment? A new study published in @nature.com, describe a smart polymer carrier that can smuggle large molecules through the skin: www.lbscience.org/en/2025/12/0... @lbscience.org

New term just dropped: Vibe proving Credit goes to Tomer Ezra (This is not an endorsement of this practice)

🧪There are lots of misconceptions around the mechanism that keeps planes up in the air. ✈️ So how is lift generated? And what are some of the popular theories that are actually wrong? A quick read for your next air travel: www.lbscience.org/en/2021/05/0... @lbscience.org

🧪A decade ago pediatricians started recommending that babies be introduced to food allergens in infancy. Now, peanut and other food allergy rates have plummeted dramatically. The change was sparked by a series of studies inspired by an Israeli snack: www.lbscience.org/en/2024/07/0... @lbscience.org

🧪We joined the party and provided a detailed response to RFK and Trump's latest statement on Tylenol use during pregnancy and Autism: www.lbscience.org/en/2025/09/2... @lbscience.org

🧪 A story of flawed science, responsibility of prestigious journals and research institutions, and infatuation with one’s own “groundbreaking” discoveries 🧫. The paper that took over a decade to be retracted from Science: www.lbscience.org/en/2025/09/0... @drorbarnir.bsky.social @lbscience.org

🧪 The toll we are taking on our Earth🌎 is quite literally weighing on it. The mass of human-produced materials far exceeds the total biomass. For more info, check out our article: www.lbscience.org/en/2025/08/1...

🧪 Does our 🧠 light up like a 💡? Well.. not quite, but neurons do emit photons in the visible-light spectrum. These brain “biophotons” may serve another layer of complexity in the marvelous world of neuronal function. Read more about the brain’s “aura” here: www.lbscience.org/en/2025/08/2...

🧪August is the month of RNA🌞 in honor of the first codon AUG. For more about the fascinating world of RNA, which is at the forefront of new therapeutics from RNAi, to mRNA vaccines, check out our article: www.lbscience.org/en/2024/08/0... #WorldRNADay @lbscience.org

🧪Our organs-on-chips for personalized cancer treatment. #MedSky

🧪🫀In this "Picture in Science" we recreated the cellular process happening in plaques to model #atherosclerosis in a dish. www.lbscience.org/en/2024/09/1... #microscopy #macrophages #hypercholesterolemia

Amazing workshop at @laws.ucl.ac.uk yesterday. Presented work w/@sarafish.bsky.social @yannaigonch.bsky.social ‬in panel w/speakers from the European Commission, CMA, AdlC, & HCC. So gratifying to see our research making positive impact in the world. Thanks much @ilianos.bsky.social for inviting us!

🧪 Within dark times, there is some light for children with rare diseases🌈 🦓 #genetherapy success in treating the deadly hereditary disease of leukocyte adhesion deficiency. www.lbscience.org/en/2025/06/1... @lbscience.org

The purest form of pride is when our children surpass us. @eleeshimshoni.bsky.social

A petition to keep politics out of the International Mathematical Olympiad. I signed, and encourage you to sign too. docs.google.com/forms/d/e/1F...

🧪 How do antibiotics negatively affect the intestines? Surprisingly it's not only by throwing our microbiome out of whack. The answer lies within the sticky mucus layer that serves as our first line of defense against the outside world: www.lbscience.org/en/2024/09/2... @lbscience.org

🧬אנחנו בתחילתה של מהפכה בתהליך פיתוח התרופות. בתקווה שגמישות ובחירת מודלים למחלות לפי המתאים ביותר יקרבו את היום שבוא תרופות חדשות יגיעו לחולים.

Congrats to Sergiu Hart, perhaps the quickest thinker I know, and a wonderful mentor, coauthor, and person, for being elected as an International Member of the National Academy of Sciences! www.nasonline.org/news/2025-na...

Great talk by @t8el.bsky.social at our econ theory seminar. As an added bonus, he publicly credited me for what he called two "Yannai tricks" in his slides: 1. Adding photos of his kids 2. Using memes Happy to see my efforts of enriching econ with computer science techniques are bearing fruit!

The problem isn't the people who are skeptical about everything they read online today because it's April 1. The problem is the people who aren't skeptical about everything they read online every other day.

Looking forward to talking tomorrow to this wonderful community about my new paper with @ellasegev.bsky.social. Thanks much for the invite, Maya Eden and @pgpiacquadio.bsky.social.

Tomorrow, Normative Economics and Economic Policy webinar by @yannaigonch.bsky.social! Join us at 5pm Paris time (11am EDT) to hear about: "Quantifying Inefficiency," joint with Ella Sagev. Link: arxiv.org/abs/2412.11984 For the zoom invite, email us!

What do a computer scientist, an economist & two legal scholars have in common? They all worry about algorithmic collusion. Join us for an interdisciplinary online event on March 21 at 1PM Central Time. 1/2

#פידמדע בקטנה: מה עושה ביולוגית? ד"ר עלי שמשוני היא ד״ר לביולוגיה ממכון ויצמן. כיום עושה פוסט־דוקטורט בMIT ועובדת על פיתוח תרופות שמתערבות ביחסי הגומלין בין גידולים סרטניים לסביבתם, באמצעות כלים של אינטליגנציה מלאכותית, הנדסת רקמות וכימיה סינתטית. מנהלת מדעית ב"מדע גדול, בקטנה". ⬇️

On #IWD2025, a story about #womenshealth and the power of #scicomm 🧪: Last year I published an article on @lbscience.org about Dr. Marlena Fejzo's personal and professional mission to hunt down the cause of morning sickness and to find a treatment for its most severe form—hyperemesis gravidarum (HG)

Come join at 3:30 Eastern today to hear me talk about algorithmic collusion by large language models, as well as a sneak peak into a new, not-yet-online, paper! @sarafish.bsky.social @ranshorrer.bsky.social #econsky

Out of our dataset of n=4 economic researchers from a café at Stanford this morning, only one has an economics PhD, which raises the conjecture that despite common belief, an econ PhD might not be a necessary condition for conducting economics research. @alroth.bsky.social @ranshorrer.bsky.social.

If you're on the PC/SPC of @acmsigecom.bsky.social #AcmEC25 and struggle with keeping track of your bids, GPT-4o provided a small script that if run in the Chrome console, counts for you how many papers you rated at each bid level so far (divided into three posts due to length reasons):

This awesome event is organized by Renato Paes Leme (Google) and James Wright (U Alberta) and will include confirmed speakers @yannaigonch.bsky.social, Jon Kleinberg, Sanmi Koyejo, Haifeng Xu, and Manish Raghavan. See below for full details! (PS let's get these folks on bluesky!)

Economists: Our profession requires a keen mind to carefully model the world around us and formulate deep insights about it. Also economists: This guy was my RA. He learned to code in SQL in only a month. I recommend him to all PhD programs, including the very best!

Things that pop to mind as I'm reading admissions files.

Looking forward to our #ASSA2025 session, Friday 10:15 in Parc 55. I’ll be presenting this paper⤵️

🧪 This is one of the coolest things @yannaigonch.bsky.social and I have ever seen. These little phytoplankton luminesce when disturbed using good old luciferase😈. Be sure to check them out at Mosquito Bay in Vieques Island of Puerto Rico 🇵🇷

It's 2025, and AI is still nowhere near replacing or even slightly augmenting @skominers.bsky.social .

🚨New Paper🚨 𝐐𝐮𝐚𝐧𝐭𝐢𝐟𝐲𝐢𝐧𝐠 𝐈𝐧𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲 Joint with Ella Segev Social choice theory provides ways for aggregating the preferences of individuals in a society, to tell us what is better for society: alternative a or alternative b. However, this theory is silent on 𝑏𝑦 ℎ𝑜𝑤 𝑚𝑢𝑐ℎ a is better than b. 1/9

I remember the first time that instead of saying "it acts both like a particle & like a wave," someone told me "we don't care what word describes it; here are the equations it follows." The latter is much clearer at some point, which I agree with @adamkapor.bsky.social should be during undergrad.

All videos of #ACMEC24 workshops are now online on the @acmsigecom.bsky.social YouTube channel: www.youtube.com/playlist?lis... Thank you @yannaigonch.bsky.social

🚨Major new version🚨 Algorithmic Collusion by Large Language Models Joint w/ @sarafish.bsky.social & @ranshorrer.bsky.social LLMs are automating many business decisions. Pricing might be next (or is already). What if multiple firms, in good faith, to use off-the-shelf-LLMs for pricing? 1/3 #EconSky

I made a theory starter pack. It includes some CS/Econ, pol-econ, and behavioral types as well... Lmk if you'd like to be added (or removed!) and I'll do my best - the edit functionality is a bit wonky atm go.bsky.app/KAGmZH4

Communication Complexity for #GenZies (this is literally my explanation in class last week): Say that two students have a dedicated WhatsApp group, in which they can only send two kinds of emojis: smileys (🙂) and frownies (🙁). They can strategize ahead of time, then each of them gets 1/2

Hello, Bluesky! I'm an Assistant Professor of Economics and of Computer Science at Harvard. I'm a theorist, exploring computer-science-inspired economics: I aim to harness approaches, aesthetics, and techniques traditionally originating in computer science to derive economically meaningful insights.