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Join the Virtual Lobby Training this Sun 6/22
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Our Revolution Virtual Lobby Training
Our Revolution Virtual Lobby Training Your elected officials in Congress need to hear from you to build support for progressive policies and make democracy work for the many! Come learn about Our Revolution’s virtual lobby model, how you can get involved, and opportunities to join your neighbors to meet with your Senators and Representatives. Event Details: Date: Sunday, June 22, 2025 Time: 7pm ET (4pm PT) Location: Virtual Training - Zoom Link

Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images
Anatoli Ulmer, Phay J. Ho, Bruno Langbehn, Stephan Kuschel, Linos Hecht, Razib Obaid, Simon Dold, Taran Driver, Joseph Duris, Ming-Fu Lin, David Cesar, Paris Franz, Zhaoheng Guo, Philip A. Hart, Andrei Kamalov, Kirk A. Larsen, Xiang Li, Michael Meyer, Kazutaka Nakahara, Robert G. Radloff, River Robles, Lara R\"onnebeck, Nick Sudar, Adam M. Summers, Linda Young, Peter Wal…

Nonlinear reversal of photo-excitation on the attosecond time scale improves ultrafast x-ray diffraction images
The advent of isolated and intense sub-femtosecond X-ray pulses enables tracking of quantummechanical motion of electrons in molecules and solids. The combination of X-ray spectroscopy and diffraction imaging is a powerful approach to visualize non-equilibrium dynamics in systems beyond few atoms. However, extreme x-ray intensities introduce significant electronic damage, limiting material contrast and spatial resolution. Here we show that newly available intense subfemtosecond (sub-fs) x-ray F…

Prime simplicial complexes of finite groups
Melissa Lee, Kamilla Rekv\'enyi
https://arxiv.org/abs/2506.19032 https://arxiv.org/pd…

Prime simplicial complexes of finite groups
The prime simplicial complex $Π(G)$ of a finite group $G$ is composed of all sets of primes $S$ where $G$ has an element of order the product of primes in $S$, with the subsets partially ordered by inclusion. This complex was introduced by Peter Cameron as the generalisation of the well-studied prime (or Gruenberg-Kegel) graphs. In this paper, we establish new results concerning two key properties of $Π(G)$: recognisability and purity. We demonstrate that recognisability by the prime simplici…

Laki Tasi steps from rugby pitch to the gridiron through NFL International Player Pathway Program https://www.raiders.com/news/laki-tasi-rugby-pitch-to-gridiron-2025-nfl-international-pathway-program-australia

May 2025 recap | The latest edition of the GÉANT School of Software Engineering, hosted by PCSS, brought together developers and experts from across Europe to explore generative #AI tools, risks, secure coding practices.
Highlights:
🔹#GenAI Buzz-Free Programming with LLMs – training by Maciej Łabędzki…

Responsible AI in Practice: Shaping a Safer Future for AI-Powered Software Development | GÉANT CONNECT Online
Poznań, 20–22 May 2025 — The latest edition of the GÉANT School of Software Engineering, held at the Poznań Supercomputing and Networking Center (PSNC), brought together top-tier developers and experts from across Europe for a deep-dive into generative AI tools, risks, and secure coding practices. At the core of the event was the acclaimed training

Recap of the day at #OSR25CH
Games are being created, educational resources are being built, zines are being put together, assessments were mapped out, change is being prepped,...
We hiked, laughed, discussed, ate,...
And the day is not even over!
Science karaoke, silent disco & more to come 🎶

A Bimodal Metallicity Distribution Function in the Ultra-Faint Dwarf Galaxy Reticulum II
Alice M. Luna, Alexander P. Ji, Anirudh Chiti, Joshua D. Simon, Daniel D. Kelson, Minsung Go, Guilherme Limberg, Ting S. Li, Anna Frebel
https://arxiv.org/abs/2506.16462

A Bimodal Metallicity Distribution Function in the Ultra-Faint Dwarf Galaxy Reticulum II
Star formation in ultra-faint dwarf galaxies (UFDs, $M_* <10^5M_\odot$) is suppressed by reionization, but may not be completely quenched. The metallicity distribution function (MDF) of stars in ultra-faint dwarf galaxies could show these signatures of reionization. However, past studies of UFD MDFs have been limited, because there are only a few dozen red giant branch (RGB) stars in such low-mass galaxies. We present low-resolution Magellan/IMACS spectroscopy of 167 stars in the UFD Reticulum …

Boundless, which bought crowdfunding publisher Unbound in March, tells authors that royalties accrued before March won't be paid until Boundless is cash stable (The Bookseller)
https://www.thebookseller.com/news/unbound…

Unbound authors will not receive unpaid royalty payments until new publisher Boundless 'is cash stable'
As founder John Mitchinson leaves, Unbound authors learn they will not receive historic royalty payments for sales of their books unless Boundless "survives and thrives".

Aaron Donald granted Jared Verse's request, puts him through an intense workout: 'Ask and you shall receive'

https://www.cbssports.com…

Laki Tasi steps from rugby pitch to the gridiron through NFL International Player Pathway Program https://www.raiders.com/news/laki-tasi-rugby-pitch-to-gridiron-2025-nfl-international-pathway-program-australia