Gro-Tsen Profile picture
21 Jan, 4 tweets, 2 min read
Two years later, this bug, which prevents opening single-page DjVu files with evince, is still present in Ubuntu 20.04 “Focal”, and now also in Debian 10 “Buster”. Despite trivial analysis, existence of a patch, and appropriate bug reports.
To wit, here is the bug-report in Ubuntu, which obviously NOBODY CARES ABOUT DESPITE THERE BEING AN OBVIOUS FIX IN THE BUG-REPORT: bugs.launchpad.net/ubuntu/+source…
The problem is:
⁃ for some idiotic reason, the MIME type of single-page DjVu files is reported as “image/vnd.djvu” and multipage DjVu as “image/vnd.djvu+multipage”,
⁃ for some idiotic reason, evince refuses to open the former (because of an explicit patch to break it‽),
⁃ neither of these idiotic things is getting fixed,
⁃ maintainers don't read bug-reports, and certainly don't act on them even when a fix is provided,

— so this bug keeps resurfacing, and I have to keep fixing it on my machines: gist.github.com/Gro-Tsen/2961f…

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More from @gro_tsen

21 Jan
J'ai eu le malheur d'avoir eu besoin de passer dans mon bureau sur le plateau de Saclay au moment où Macron était dans le coin à se gargariser de son «plan quantique» juste de l'autre côté de la rue. Petit récit et quelques réflexions sur les déplacements présidentiels. ⤵️ •1/36
Je vais m'abstenir de dire ce que je pense de la conception du pilotage de la recherche consistant à choisir un buzzword (blockchain, intelligence artificielle, informatique quantique…) et à inciter tout le monde à se précipiter dedans pour essayer de récupérer les sous. •2/36
Disons juste que ma conception de la science ce serait plutôt de cultiver le maximum de variété dans les sujets explorés, à la fois pour préserver la diversité écologique de la recherche conçue comme un organisme vivant et interdépendant, … •3/36
Read 36 tweets
20 Jan
#TIL that the oaths of office for the president and vice-president of the United States are quite different. The president is supposed to “preserve, protect and defend”, whereas the vp will “support and defend”. Also, the vp's oath mentions “enemies”, not the president's.
The vp makes an oath of allegiance which the president does not. The president will “faithfully execute the Office of President” (does one execute an office? that's a bit strange, isn't it?) whereas the vp will “faithfully discharge the duties of the office”.
And, perhaps more importantly, the president vows to do all this “to the best of [their] abilities”, whereas the vp will do this “without any mental reservation”.

I get the reason for these differences: one oath is in the Constitution, the other is in a 19th century law.
Read 4 tweets
19 Jan
I stumbled upon this paper which performs multivariate linear regression analysis to try to infer the effectiveness of various policy measures on covid-19 mortality.
ajtmh.org/content/journa…
One of their conclusions is that mask mandates are very effective. Another is that lockdown duration has no statistically significant effect (the model doesn't even conclude whether the effect is positive or negative). Image
I'm very skeptical as to whether we can draw any useful conclusion from such multivariate linear regressions between countries. There will be simply too many unknown variables and confounders. But this isn't really my point here.
Read 7 tweets
19 Jan
These cool images remind me of a physics question I have: I've been told before that “for thermodynamical reasons”, it's not possible to achieve a temperature greater than that of the surface of the sun (~6000K) in a solar furnace. Several questions: … •1/3
Is this correct? What exactly is the thermodynamical argument in question? (It sounds superficially reasonable, but I can't figure out how to formalize it.) Can we reformulate it in the context of geometrical optics? What would it then say? And, more importantly: … •2/3
… what, exactly, are the assumptions used in the reasoning? (Clearly we can use solar panels and electric heating to produce a temperature far beyond 6000K, so I'd like to know exactly what the “solar furnace” hypothesis means. Something like “no cold sink involved”?) •3/3
Read 10 tweets
19 Jan
Quelques remarques sur une petite particularité du réseau routier francilien: la sortie de l'A86 intérieure vers Jouy-en-Josas. Ça se passe à peu près ici sur la carte: openstreetmap.org/#map=15/48.782… — l'A86/N12 est la grande route est-ouest. •1/22
Jouy-en-Josas est au sud, Versailles et Vélizy au nord (Versailles au nord-ouest, Vélizy au nord-est). On vient de l'est. L'A86 bifurque: elle devient N12 si on va tout droit vers l'ouest, et passe en tunnel «duplex» si on tourne vers le nord. •2/22
Mais mettons que (venant de l'est, donc) on cherche à aller vers Jouy-en-Josas. Si on suit les panneaux routiers, voici ce qui se passe: on prend la branche N12 de la bifurcation, on prend la sortie nº2 étiquetée Versailles et Jouy-en-Josas: google.com/maps/@48.78459… •3/22
Read 22 tweets
29 Dec 20
Je voudrais poser une question sur la perception des coûts et dommages liés à la pandémie, dont j'espère tirer un enseignement utile sur la perception psychologique des choses. Il faut que ma question soit précise, donc c'est un peu long: merci d'avance de bien lire. ⤵️ •1/10
On va considérer la France pour essayer de garder les choses un peu concentrées, donc ma question s'adresse à ceux qui vivent en France pendant le covid, et elle porte sur la perception des coûts et dommages de cette pandémie et des confinements. •2/10
Je me place dans une perspective utilitariste, c'est-à-dire que quand je dis qu'un coût X est moindre qu'un coût Y (noté X<Y), ça signifie que X est préférable, ou est le moindre mal, que Y, et donc que la société devrait choisir X sur Y, c'est uniquement ça. •3/10
Read 10 tweets

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