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Lieber KI-Durst statt KI first: Duolingo-Chef rudert zurück
In einem internen Memo machte Luis von Ahn eine klare Ansage: Neueinstellungen von Menschen gebe es nur, wenn die KI passen muss. Was er inzwischen dazu sagt.

Chow polynomials of totally nonnegative matrices and posets
Petter Br\"and\'en, Lorenzo Vecchi
https://arxiv.org/abs/2509.17852 https://arxiv.org/…

Chow polynomials of totally nonnegative matrices and posets
Huh-Stevens and Ferroni-Schröter independently conjectured that the Hilbert-Poincaré series of the Chow ring of any geometric lattice has only real zeros, and Ferroni, Matherne and the second author extended this conjecture to the Chow polynomial of any Cohen-Macaulay poset. In this paper we address these conjectures by providing new defining relations and properties of Chow functions of posets and matrices. These are used, in conjunction with new techniques on interlacing sequences of polyno…

Louisiana’s Chief Election Official Confirms Lack of Widespread Noncitizen Voting | Brennan Center for Justice
https://www.brennancenter.org/our-work/analysis-opinion/louisianas-chief-election-official-confirms-lack-widespread-noncitizen

Higgs mode in superconducting Titanium nanostructures
Laurine Marian, Edouard Pinsolle, Samuel Houle, Maxime Durand-Gasselin, Christian Lupien, Bertrand Reulet
https://arxiv.org/abs/2509.15327

Higgs mode in superconducting Titanium nanostructures
We report observations of Higgs modes in superconducting Titanium nanostructures at very low temperature. They appear as anomalies in the microwave complex impedance of the samples revealed by the presence of a dc supercurrent. By varying the sample geometry and contact material, we probe how the Higgs modes are sensitive to the dimensionality of superconductivity, the penetration of the dc and ac current densities in the sample and the dissipation in the contacts.

Total Loss Functions for Measuring the Accuracy of Nonnegative Cross-Sectional Predictions
Charles D. Coleman
https://arxiv.org/abs/2507.15136 https://

Total Loss Functions for Measuring the Accuracy of Nonnegative Cross-Sectional Predictions
The total loss function associated with a set of cross-sectional predictions, that is, estimates or forecasts, summarizes the set's overall accuracy. Its arguments are the individual cross-sectional units' loss functions. Under general assumptions, including impartiality, about the forms of the individual loss functions, and the specific assumptions that the total loss function is anonymous and monotonic, only the additive, multiplicative and L-type (with restrictions) total loss functions are …

Product of nonnegative selfadjoint operators in unbounded settings
Yosra Barkaoui, Seppo Hassi
https://arxiv.org/abs/2507.14404 https://

Product of nonnegative selfadjoint operators in unbounded settings
In this paper, necessary and sufficient conditions are established for the factorization of a closed, in general, unbounded operator $T=AB$ into a product of two nonnegative selfadjoint operators $A$ and $B.$ Already the special case, where $A$ or $B$ is bounded, leads to new results and is of wider interest, since the problem is connected to the notion of similarity of the operator $T$ to a selfadjoint one, but, in fact, goes beyond this case. It is proved that this subclass of operators can b…

Un commentaire en dessous d'un article du Figaro https://sante.lefigaro.fr/social/sante-publique/a-quel-point-les-neonicotinoides-sont-ils-nocifs-pour-la-sante-humaine-et-pour-l-e…

Loi Duplomb: à quel point les néonicotinoïdes sont-ils nocifs pour la santé humaine et pour l’environnement?
DÉCRYPTAGE - La mesure la plus décriée de la loi agricole dite «Duplomb» est la réintroduction de l’acétamipride, un insecticide de la famille des néonicotinoïdes interdit en France depuis 2018 mais autorisé ailleurs en Europe jusqu’en 2033.

Cooperation and competition of basepairing and electrostatic interactions in mixtures of DNA nanostars and polylysine
Gabrielle R. Abraham, Tianhao Li, Anna Nguyen, William M. Jacobs, Omar A. Saleh
https://arxiv.org/abs/2507.16179

Cooperation and competition of basepairing and electrostatic interactions in mixtures of DNA nanostars and polylysine
Phase separation in biomolecular mixtures can result from multiple physical interactions, which may act either complementarily or antagonistically. In the case of protein--nucleic acid mixtures, charge plays a key role but can have contrasting effects on phase behavior. Attractive electrostatic interactions between oppositely charged macromolecules are screened by added salt, reducing the driving force for coacervation. By contrast, base-pairing interactions between nucleic acids are diminished…

Nonreciprocal plasmons in one-dimensional carbon nanostructures
\'Alvaro Rodr\'iguez Echarri, F. Javier Garc\'ia de Abajo, Joel D. Cox
https://arxiv.org/abs/2509.16109

Nonreciprocal plasmons in one-dimensional carbon nanostructures
The directional control of light in miniaturized plasmonic waveguides holds appealing possibilities for emerging nanophotonic technologies, but is hindered by the intrinsic reciprocal optical response of conventional plasmonic materials. While the ability of graphene to sustain large electrical currents shows promise for nonreciprocal plasmonics, studies have been limited to extended samples characterized by linear electrical dispersion. Here, we theoretically explore quantum finite-size and no…

Die deutschen Unternehmen halten sich bei Neueinstellungen im IT-Bereich derzeit stark zurück. Laut einer aktuellen Analyse des Instituts der deutschen Wirtschaft Köln ging die Zahl offener IT-Stellen zwischen 2023 und 2024 um mehr als ein Viertel zurück – ein Minus von rund 16.500 Stellen.
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