Stephan Mescher

Mathematiker an der Uni Halle. Vorher Leipzig, London, Bochum, Bielefeld, Vechta. Manchmal etwas altmodischer Geek mit vielen Interessen.

[Jamie Walters, CAIA @JWalters314]

The European mind understands it perfectly. This is what imperial decadence looks like: public institutions converted into branded spectacle, civic memory replaced by adrenaline theater, and the People’s House turned into a content backdrop for regime propaganda.

The joke is not that Europe cannot comprehend it. The joke is that America no longer recognizes what it is becoming.

[Hillary Clinton @HillaryClinton]

This is what Trump's done to the people's house:

A third of it is rubble.

Another third is a cage match.

What a metaphor.

[Pope Leo XIV @Pontifex]

Artificial intelligences do not undergo experiences, do not possess a body, do not feel joy or pain, do not mature through relationships, and do not know from within what love, work, friendship or responsibility mean. Nor do they have a moral conscience, since they do not judge good and evil, grasp the ultimate meaning of situations, or bear responsibility for consequences. They may imitate or even simulate, but they do not understand what they produce, for they lack the affective, relational, and spiritual perspective through which human beings grow in wisdom. #MagnificaHumanitas

[Tobias Escher @TobiasEscher]

In der ganzen Causa konnte man im Schnelldurchlauf beobachten, wie es diesem Land ergeht, wenn man die Entscheidungsgewalt einer lauten Minderheit aus Verschwörungstheoretikern, Influencern und TikTok-Süchtigen in die Hand gibt.

[Sarah Necker @SarahNecker]

Thrilled that our paper "Almost fare free: Impact of a cheap public transport ticket on mobility patterns and train delays" - the 9-Euro Ticket - is now out at @JPubEcon:
https://t.co/OzFA3Dy0ou
Using three different datasets and MVPF analysis, we find that...

[Mathew @mathewclarke]

That's what happens when you meet a guy whose entire job for decades has been shaking hands

[Rieke @Riekerambo]

Ich hätte nie gedacht, dass ich mal eine Person sein würde, die um 6:00 aufsteht, um vor der Arbeit noch zum Sport zu gehen.
Und ich hatte Recht.

[Ben Eisenhart @BEisenhart]

Being in your early 40s is weird, man. People around your age are in every stage of life. You have people who are grandparents. You have people who have newborns. You have people dating 25-year-olds. You have people celebrating their 20th wedding anniversary. Some of them look 60, and some of them look 30. All the bases are covered when you are in your early 40s.

[Bogáta Timár @BogataTimar]

okay I guess I have to talk about Péter Magyar here.
Let me just start with saying, in a very unladylike way, that you guys seem to have zero clue what happened in Hungary in the last two years, you completely miss the point, and you're a disappointing bunch.
Let's go.

[Dario Schramm @darioschramm]

Schlimmer als Trump sind nur die ganzen Republikaner, die aus eigenem Machterhalt (seit Jahren) wirklich jeden Funken Moral und Anstand über Bord geworfen haben.

[Justin Wolfers @JustinWolfers]

It is utterly dispiriting how few of these bubbles are reliable sources of information.

[Fermat's Library @fermatslibrary]

Bernhard Riemann died in 1866 at the age of 39. Here is a list of things named after him.

Riemann bilinear relations
Riemann conditions
Riemann form
Riemann function
Riemann–Hurwitz formula
Riemann matrix
Riemann operator
Riemann singularity theorem
Riemann surface
Compact Riemann surface
The tangential Cauchy–Riemann complex
Zariski–Riemann space
Cauchy–Riemann equations
Riemann integral
Generalized Riemann integral
Riemann multiple integral
Riemann invariant
Riemann mapping theorem
Measurable Riemann mapping theorem
Riemann problem
Riemann solver
Riemann sphere
Riemann–Hilbert correspondence
Riemann–Hilbert problem
Riemann–Lebesgue lemma
Riemann–Liouville integral
Riemann–Roch theorem
Arithmetic Riemann–Roch theorem
Riemann–Roch theorem for smooth manifolds
Grothendieck–Hirzebruch–Riemann–Roch theorem
Hirzebruch–Riemann–Roch theorem
Riemann–Stieltjes integral
Riemann series theorem
Riemann sum
Riemann–von Mangoldt formula
Riemann hypothesis
Generalized Riemann hypothesis
Grand Riemann hypothesis
Riemann hypothesis for curves over finite fields
Riemann theta function
Riemann Xi function
Riemann zeta function
Riemann–Siegel formula
Riemann–Siegel theta function
Free Riemann gas
Riemann invariant
Riemann–Cartan geometry
Riemann–Silberstein vector
Riemann-Lebovitz formulation
Riemann curvature tensor
Riemann tensor
Riemannian graph
Riemannian group
Riemannian holonomy
Riemannian manifold also called Riemannian space
Riemannian metric tensor
Riemannian Penrose inequality
Riemannian polyhedron
Riemannian singular value decomposition
Riemannian submanifold
Riemannian submersion
Riemannian volume form
Riemannian wavefield extrapolation
Sub-Riemannian manifold
Riemannian symmetric space
Riemann's differential equation
Riemann's existence theorem
Riemann's explicit formula
Riemann's minimal surface
Riemann's theorem on removable singularities

[Andreas Püttmann @Puettmann_Bonn]

Da haben Italiens machtgierige Rechte was auf ihre klebrigen Finger gekriegt. Immer wollen sie die Regeln des Spiels zu ihren Gunsten ändern, wenn sie an die Macht gelangt sind.

[Tim Siedell @badbanana]

Man was not meant to monitor this many situations.

[David Perell Clips @PerellClips]

Ezra Klein: "Having AI summarize a book or paper for me is a disaster.

It has no idea what I really wanted to know and wouldn't have made the connections I would've made. I'm interested in the thing I will see that other people wouldn't have seen, and I think AI typically sees what everybody else would see.

I'm not saying that AI can't be useful, but I'm pretty against shortcuts.

And obviously, you have to limit the amount of work you're doing. You can't read literally everything. But in some ways, I think it's more dangerous to think you've read something that you haven't than to not read it at all.

I think the time you spend with things is pretty important."

@ezraklein

[Simon Maechling @simonmaechling]

I’m a chemist. I need to say this - because it’s getting dangerous out there. The biggest health myth in the world isn’t about vaccines.

Or GMOs. Or fluoride.

It’s the root of all of them.
It’s called chemophobia - and it’s killing science.

Fear of “chemicals” now drives vaccine rejection, GMO bans, food hysteria, and entire political movements.

From tampons to tap water, people have been taught to fear chemistry - the very thing that keeps us alive.

Chemophobia tells us:
“Natural is good.”
“Synthetic is bad.”

That’s a lie.

Botulinum toxin is 100% natural and one of the deadliest molecules known.

Aspirin is synthetic and life-saving.

We’ve gone from banning harmful substances for good reason…to banning safe, well-tested molecules for emotional reasons.

You’ve seen the slogans:

“If you can’t pronounce it, don’t eat it.”
“Paraben-free.”
“Clean beauty.”

They sound empowering. But they’re not science - they’re marketing.

And they’re making the world dumber, poorer, and sicker.

Your body doesn’t care if a molecule comes from a plant or a lab.
Vitamin C is vitamin C.

Formaldehyde is formaldehyde and your body makes more of it every day than any vaccine ever could.

Dose matters. Source doesn’t.
This fear isn’t harmless.

It shapes public policy.
It blocks innovation.
It raises food prices.
It slows down cancer treatments.

Chemophobia is now mainstream and it’s costing lives.

Scientists aren’t losing because we’re wrong. We’re losing because fear spreads faster than facts.

Because influencers sell fear for clicks. Because lawyers monetize doubt.

And because scientists are too tired to fight back. So here’s my message, as a chemist and as a citizen:

Learn how toxicology works.
Call out chemical fear-mongering.
Support policies based on evidence, not emotion.

Chemistry isn’t the enemy.
It’s the reason you have clean water, safe food, and modern medicine.

If we let fear win, we lose all of it.

[Stephan Mescher @FullMescher]

@BBCBreaking It‘s not exactly Franklin D. Roosevelt either…

[Mathieu von Rohr @mathieuvonrohr]

Jeder amerikanische Krieg im Nahen Osten sollte kurz werden. Keiner wurde es. Die einzige ehrliche Antwort auf “Was passiert jetzt?” ist: Niemand weiß es. Ein demokratischer, freier Iran ist wünschenswert. Ob er das Ergebnis sein wird? Die nächsten Wochen werden es zeigen.

[Sarah Longwell @SarahLongwell25]

Today is a good reminder of how Elon Musk absolutely destroyed Twitter’s utility as an information tool.

[Mathieu von Rohr @mathieuvonrohr]

Be careful with those who once again frame complex conflicts as moral litmus tests — dividing the world into the “free” and those who supposedly side with extremists. This rhetoric has a history, and it has led to disastrous decisions before.