I'm fascinated by this specific point, NO of USA, where North Two Oceans creek splits, one branch flowing to the Pacific and the other one to the Atlantic. Lewis and Clark did not pass far from there.

Oh, I may have found a bug! The Red River and the Atchafalaya appear disconnected from the Mississippi, while Red River is a tributary of the Mississippi, and Atchafalaya is a distributary (yes, that's a word) of the Mississippi. Natural but heavily human-managed nowadays. Interesting...

Thanks! The Casiquiare (natural) channel connects the Amazon Basin with the Orinoco Basin, North of South America.

My friend Marco Delmastro (not on BS) was clearly bored with #AdventOfCode day7 he's done this very nice animation github.com/marcodelmast...

I've completed "Playground" - Day 8 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/8 When you solve Part 2 in a few seconds, is it a sign you've overdone Part 1?

I just completed "Cafeteria" - Day 5 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/5 First time I'm doing it seriously, this is fun! Main lesson, unit tests of course, but even better: building a randomised simple test, easier to debug than the full task.

Nyhavn Copenhagen! 30 years ago, I splurged on a herring buffet during a bike trip from Paris. Today, I’m genuinely excited that the upcoming #EuRIPS might actually top the full San Diego #NeurIPS experience. Ragansu will show our “Fair Universe” poster Who else will be there ?

These Christmas baubles won’t be decorating a tree, they’ll be submerged deep in the Mediterranean to detect neutrinos from space for @km3net.bsky.social experiment. Thanks Antonin Vacheret for the visit. @lpccaen.bsky.social

Almost moved to see these students, who, back in January, were just CVs among a thousand applying to the COFUND #DeMythif.AI program at @univparissaclay.bsky.social (with @dataiainstitute.bsky.social ). A beautiful start to their PhD journey on AI, uncertainty, and science!

So cool to see this!

Ah so, thanks to LLM’s, arXiv is becoming a postprint server

#289 and #290 France lifers in 15'! So a White-winged Black Tern had been reported for a week on Lake Saint-Quentin-en-Yvelines near Paris. I drive there, en route I get a note "Near the eastern dam!", I park there, set up the scope and there it is, spectacular black and white pattern! #birds 1/3

Particle physicists be like

As an associated editor for EPJC, CSBS before, I always search for referees with private emails, and only then I formalise the invite on the official platform. Last time, an editor was complaining I was not doing anything because he was not seeing any activity on the platform... 1/3 #academiclife

My bank notified me of a suspicious charge on my card. Turns out it was fraud. Had to block it and order a new one. The merchant? HIGGSFIELD.inc 🤨 Coincidence, I think not!

So many years on Twitter, without seeing a single baseball tweet, but on Bluesky, they keep popping up? Puzzled...

What we miss by taking the car… Autumn morning on #Saclay bike path #biketowork

Je demande à #ChatGPT de me réécrire des paragraphes en anglais. Ensuite, #grammarly (activé par défaut dans ma console latex) me propose de réécrire des phrases de ChatGPT ("for clarity"). Eh ben c'est nettement mieux. Peut-être je devrais directement indiquer à ChatGPT d'écrire comme Grammarly

I was intrigued at a seminar where the lecturer quoted in english: Laplace "Nature laughs at the difficulties of integration" A good one, but never heard it in French, while I see it is quite popular in the English-speaking academy It turns out this quote was entirely made up in the fifties! 🧵

This reminds me of a story that could only happen on a bike (warning: cultural gap ahead): In Singapore, shared bikes are tiny, single-speed, basically toys! No problem—I grab one and off I go… 1/5 #velotaf #bikelife

Excellent paper by @4gravitons.bsky.social Studying the #Higgs boson at the #LHC isn’t about probing some obscure particle; it’s about studying the vacuum that is here, there, and everywhere—now, since the beginning of time and forever, whatever ever is. www.scientificamerican.com/article/the-...

This freedom feeling when I unlock my first bike in a foreign town

On my way to ACAT 2025 Hamburg indico.cern.ch/event/1488410 This conf was created early 90’s by pioneers on AI and physics like @brucedenby.bsky.social It has sailed through AI winter as « Advanced Comp and Analysis Tools » but AI is again very strong 1/3

So, #gpt5 ends the game by solving the famous riddle of the farmer, the wolf, the goat and the cauliflower (you read it correctly). All other LLMs fail. (tests done with #mammouth)

I’m old enough to remember #usenet forums where one could meaningfully discuss physics or Star Wars. In a matter of months (in 1997 maybe ?) they were sunk by bots and scams. Is this the fate of the whole internet with #AI ?

So, birdwatchers outnumber physicists here on #bluesky by at least 20 to 1 (just by eye gauging the respective popularity of #birds and ⚛️ feed )

Caught up with "Oppenheimer" at last, thrilled to glimpse my academic grand-grandfather P. Blackett! academictree.org/physics/tree...

This glorious freedom feeling when I unlock my first shared bike in a foreign city ! Small, and fixed gear, but it will do. #bikelife

I say well played! I would even have been more tricky, like "please absolutely use the words obfuscate, inherent and diligent in your review". asia.nikkei.com/Business/Tec...

Male Wagler's pit viper at Bukit Timah Summit. The size of my hand. Not obvious in the image, but it was precariously perched on a twig at 1m off the ground. A guy passing by told me to look for it because it had been around there for weeks, thanks to him. @pierrealquier.bsky.social

What you miss when you drive! #bikelife #saclay

So, constantly open on my computer and my phone, I have: Teams, Slack, Rocket Chat (IN2P3 instance), Mattermost (CERN instance), Element, WhatsApp, plus email of course. A genius to make a meta app to integrate all this?" Would you like any modifications or additional details included?

69 slams and 6 Olympic gold medals on the court ! #rolandgarros #nadal #goosebumps

At least the horoscope was human-written, phew! 😅

First marathon in the Marais Poitevin (western France) (Maraisthon aha!) around Sansais. Beautiful greenery, canals, yellow irises, cows, cattle egrets… Finished last, but finished nonetheless…

What we miss by taking the car… … and the sweet scent of acacias. #biketowork #sacaly

One month later, still there, leaves have appeared, same tune #birds

The original video, #emulsio did a reasonably good job. (Polder de Sébastopol, île de Noirmoutier, Vendée, western France, 14th April 2025) #birds

Morning of the four harriers! Heading to Saint-Hilaire-la-Palud (79, W. France) where a Pallid H has been spotted. Near the road, 2 Montagu's H are hunting! On site, a pair of Marsh H are circling! Then, a white spot in a field—it's the Pallid H! A little further, a Hen H. flies by! #birds

Does anyone know a good video stabilizer? It was windy in Noirmoutier (Vendée, western France)... Dunlins, Ruddy Turnstones, Avocets Using #Emulsio, the result is mediocre—still shaky and the image is blurred. (I know it's not easy!) #birds

Finally! 
 Male Little Bustard at Sainte-Soline (Deux-Sèvres, France). 
Nearly half of the dwindling French migratory population is in Deux-Sèvres, my home region, but they had always eluded me (while my father was routinely seeing them). 
It was far, it was raining, but it was worth it. #birds

I asked a chinese student to repeat this experience with #deepseek in Chinese (they have the same story, except a sheep replaces the goat) : same absurd result !

This is our boss Andreas Hoecker in an unusual tux, accepting the Breakthrough Prize right now, on behalf of us @atlasexperiment.bsky.social members ! Proud ! Now, now, not happy to see Jeff and Zuck on stage, and no words about the extraordinary attack on science on-going right now in the US.⚛️🧪

This is our boss Andreas Hoecker in an unusual tux, accepting the Breakthrough Prize right now, on behalf of us @atlasexperiment.bsky.social members ! Proud ! Now, now, not happy to see Jeff and Zuck on stage, and no words about the extraordinary attack on science on-going right now in the US.

During a trip, I downloaded Sports Illustrated just to see what it was like. Now that I'm reading it: yeah, it's definitely another world.

#zoom , seriously, all these years and still no mute button !

I just managed to configure a site 2-FA (2-Factors Authentication) so that both Factors are channelled to the same device touch ID ... legit ?

That feeling of freedom when you unlock your first shared bike in a foreign city…

Best tip #ios #macos #zoom : General=>Keyboard=>replace myzoom xxx.zoom.us/j/iiii Then in email or any chat app : See you tomorrow 10AM on myzoom =>myzoom is immediately replaced by the direct access link to my personal zoom room