David Rousseau
@dhpmrou.bsky.social
Particle Physicist at IJCLab-Orsay, ATLAS experiment at CERN.
Higgs Boson and AI.
#ML competitions and open datasets Higgsml, TrackML, and now Fair Universe Higgsml Uncertainties
#ai4science
Higgs Boson and AI.
#ML competitions and open datasets Higgsml, TrackML, and now Fair Universe Higgsml Uncertainties
#ai4science
Then I drive to another spot with a full view of the lake. Barely out of the car, I hardly notice a very common Black-headed Gull landing next to a very common Herring Gull just meters from shore.
Wait, this Black-headed is minuscule, yes indeed, this is a Grey Phalarope!
#birds
2/3
Wait, this Black-headed is minuscule, yes indeed, this is a Grey Phalarope!
#birds
2/3
October 25, 2025 at 8:40 PM
Then I drive to another spot with a full view of the lake. Barely out of the car, I hardly notice a very common Black-headed Gull landing next to a very common Herring Gull just meters from shore.
Wait, this Black-headed is minuscule, yes indeed, this is a Grey Phalarope!
#birds
2/3
Wait, this Black-headed is minuscule, yes indeed, this is a Grey Phalarope!
#birds
2/3
#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
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
October 25, 2025 at 8:40 PM
#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
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
October 25, 2025 at 8:08 PM
Particle physicists be like
October 10, 2025 at 7:35 AM
This freedom feeling when I unlock my first bike in a foreign town
September 12, 2025 at 4:35 PM
This freedom feeling when I unlock my first bike in a foreign town
See for example #Llama Maverick ignores completely the statement about the goat not liking the cauliflower, and proceed with the usual more complex solution (which I truncated)
August 12, 2025 at 5:31 PM
See for example #Llama Maverick ignores completely the statement about the goat not liking the cauliflower, and proceed with the usual more complex solution (which I truncated)
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
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
July 9, 2025 at 7:33 AM
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
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
June 6, 2025 at 10:32 PM
May 25, 2025 at 8:21 PM
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…
Finished last, but finished nonetheless…
May 12, 2025 at 7:16 AM
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…
Finished last, but finished nonetheless…
May 8, 2025 at 1:28 PM
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
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
April 25, 2025 at 12:58 PM
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
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
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
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
April 19, 2025 at 2:19 PM
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
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
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.⚛️🧪
@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.⚛️🧪
April 12, 2025 at 7:53 PM
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.⚛️🧪
@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.
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.
April 12, 2025 at 7:32 PM
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.
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.
April 12, 2025 at 12:42 PM
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.
That feeling of freedom when you unlock your first shared bike in a foreign city…
March 27, 2025 at 11:09 AM
That feeling of freedom when you unlock your first shared bike in a foreign city…