i have very rapidly become incapable of thinking about anything that isn’t this video

I spent entirely too much time on this illustration, but now it's done: the two different kind of information you can glean from a spectral line that you get from observing a bunch of stars. If the stars are moving in a concerted way ("bulk motion"), the Doppler shift will tell you at least 🧪🔭⚛️ 🧵1/

First IG ad breaks making me want to exit the app instantly. Now Messenger being reintegrated into fb. All of this while flooding markets with pervert glasses nobody wants. Does Meta ever get tired of shooting itself in the dick?

🌞😎 #GuidedTours #200years On 14 April at 14h (in French) and 15h (in Dutch), our Solar Physics and Space Weather Department opens its doors for #guidedtours. Now’s your chance to learn more about the Sun! Anyone is welcome but the number of participants is limited. 200year.observatory....#GuidedTours

Today is the official first day of spring (in the N. Hemisphere). We passed the equinox on March 20 at 2:46pm (UTC). (Figure: Cosmografia, 1544 – Sebastian Münster).

Brilliantly said by @emilymbender.bsky.social This strategy is the usual conservative playbook: debate is not being suppressed, it’s permanently happening and they keep loosing to serious people. They can’t admit it so they whine about not being heard.

A while ago, I started playing around with some world building for a fictional setting. The obvious place to start was with astronomy. I thought I'd share some of that on the blog. 🔭 jrekier.github.io/bit-blog/pos...

Yes his rhetoric was alarmist, and turned out not to be true. But it was also racist? The population bomb was about gross Other people not controlling their animal fertility. All paths of birth rates talk lead to one place.

🚨Paper alert🚨 In our new study, we show how internal waves shape the seafloor and affect sediment distribution and resuspension. Check it out here in open access 👇 doi.org/10.1002/esp....

Large Language Models killed the em-dash. I can’t read it, or use it myself, without immediately thinking of #AI.slop

There’s so much AI slop around. I was just searching for art ideas online and found a YouTube video from 2017. I genuinely thought ‘oh yeah, good stuff’ when I read the date. WTH are we doing? 😵‍💫

“I wanna leave and go to the spelling bee.”

À qui l'Assemblée nationale a consacré une minute de silence le 17 février? @mediapart.fr a pu consulter les milliers de tweets anonymes postés par Quentin Deranque. Il s'y revendiquait "fasciste", glorifiait le nazisme et affichait un racisme d'une rare brutalité. avec @turcanmarie.bsky.social

This is so so upsetting. So Grammerly is violating the memory of bell hooks AND making AI versions of the rest of us before we're even dead. Someone tell me who to sue, not even joking.

This dumb take is doing grueling numbers.

Ever noticed how there are more days between spring and fall than between the fall and spring (in the northern hemisphere)? That is due to the eccentricity of the Earth's orbit. I talk about it and do the math in this blog post ⚛️ 🧪 jrekier.github.io/bit-blog/pos...

If my students don’t immediately understand the lesson, I’m a bad teacher. If they understand it quickly, that means I’m boring them, which also makes me a bad teacher. Yes, I do have anxiety. 🎓🧪

I find myself slightly suprised to be recommending a video from the Norwegian Consumer Council, but it's bloody good. www.youtube.com/watch?v=T4Up...

Pas un jour sans que les Insoumis, à propos des porosités entre droite et extrême droite, ne citent l'excellent livre de Johann Chapoutot, Les irresponsables. Je l'avais reçu en mars dernier. L'émission n'a rien perdu. www.arretsurimages.net/emissions/je...

This is heart-wrenching. Please take some time to read his story and reflect.

If "AI" was being built, used, and planned for in responsible ways--the way a civilization designed to enhance human thriving would do--then a lot more people would be enthusiastic about its potential. But the people in charge of defining what AI will be are the fucking worst short-term scumbags.

Best Valentine’s Day selfie ever.

I made this gif using Tikzpicture. It represents the diurnal rotation of Earth, the slow precession of its rotation axis and its nutation.

“All children held in immigration detention should be immediately released, and these facilities should be permanently shuttered.”

its amazing how chatgpt knows everything about subjects I know nothing about, but is wrong like 40% of the time in things im an expert on. not going to think about this any further

🚀 LIFTOFF! ESA astronaut Sophie Adenot and #Crew12 are on their way. GO #εpsilon!

Writing a book worth reading *should* take time. It should take effort. The crafting of it and the thinking in it go hand in hand. And the rewards, for both the author and the readers, come from that effort. That the AI bros don't understand this is disturbing and revealing.

You can find more of these incredible ideas in the Journal of Applied Buzzwords.

Bad bunny on the other hand. Oh my god are you kidding me? 🇵🇷

"Such is the modern centrist credo: to overcome a perception rooted in fantasy, it may be necessary to make the reality of people’s lives worse."

I say this regularly. People use performative as a substitute for 'inauthentic' and we could all just say the words we mean to say. Erving Goffman helps us to understand that we perform all of the time in real life. Life itself is often a performance of self.

I'm convinced AI is our generation's radium - a discovery with genuinely useful applications in specific, controlled circumstances that we stupidly put in everything from kid's toys to toothpaste until we realised the harm far too late where future generations will ask if we were out of our minds.

It’s baseball season And Green Day are sell outs ⚾️

Today in enshitification: iOS 26. Omg Apple, go die!

An advice for young folks learning to code. Please get comfortable coding the old school way, looking up solutions on stackoverflow etc before you start getting AI assist. You can trust AI with menial tasks but not with critical code components. It is nowhere even close to the human brain. 🧪⚛️

Thought I was done writing about the bullshit that outside media says about S.F. But this pair — making fun of unhoused people in wheelchairs — coaxed me out of retirement. On loving the city, and the fragility of visiting adult male Patriots fans. Gift link 🎁 www.sfchronicle.com/totalsf/arti...

Tom Morello takes the stage at his Defend Minnesota! benefit concert at First Avenue 🎸 📸: @chrisrstrib.bsky.social

☠️Perilous Shores 1.7.3: farmlands www.patreon.com/posts/149496...

There are 3,800 kids in ICE custody.

I wrote this song on Saturday, recorded it yesterday and released it to you today in response to the state terror being visited on the city of Minneapolis. It’s dedicated to the people of Minneapolis, our innocent immigrant neighbors and in memory of Alex Pretti and Renee Good. Stay free

What a day for the O-ring of my water bottle to fail me. #NASAchallenger #OTD

I had to stop reading for a bit when I got here because I started to cry. Alex Pretti seems to have grown up to be everything his parents could have hoped he would be. And then they killed him literally because he was good and decent, brave and righteous.

Forty years after the Challenger disaster, engineers who fought to stop the launch still grapple with the guilt of "what if." The tragedy remains a definitive lesson in the danger of prioritizing management goals over engineering truths and the fatal cost of silencing dissenting voices.

In 2026, I want to start blogging again. I have migrated my blog to a new template by @flo-bit.dev jrekier.github.io/bit-blog/

Tomorrow’s front page of the Minnesota Star Tribune: Jan. 23, 2026

This account stuck my comic through an ugly AI filter, removed my @ from the bottom and blocked me when I called them out.

Short timelapse from last night's aurora in Belgium! Annoying clouds though #aurora

Absolutely insane messaging to write this long detailed account of all the violent horrors being inflicted on your voters and capping it off with "pls don't do anything about it"

The Right likes to incite panics about birthrates (I think those rates are fine). They also expect debt-ridden parents to shoulder all the pressure and responsibilities of raising kids. Give people free child care, health care, schools, etc. You'll soon see birthrates go up! It takes a village.