Tootfinder

January 20, 2026 -- World leaders are gathered at the World Economic Forum annual meeting in Davos ... (Heather Cox Richardson/Letters from an American)
https://heathercoxrichardson.substack.com/p/january-20-2026
http://www.memeorandum.com/260121/p48#a260121p48

Luxembourg-based Hydrosat, which builds AI-based thermal infrared satellite tech to provide data for water resource management and more, raised a $60M Series B (Ingrid Lunden/Resilience Media)
https://resiliencemedia.co/hydrosat-rais…

Hydrosat raises $60M for its thermal satellite imaging tech
A startup building AI-based thermal infrared satellite technology to provide data for water resource management, public safety and defence applications

Convergence Guarantees for Federated SARSA with Local Training and Heterogeneous Agents
Paul Mangold, Elo\"ise Berthier, Eric Moulines
https://arxiv.org/abs/2512.17688 https://arxiv.org/pdf/2512.17688 https://arxiv.org/html/2512.17688
arXiv:2512.17688v1 Announce Type: new
Abstract: We present a novel theoretical analysis of Federated SARSA (FedSARSA) with linear function approximation and local training. We establish convergence guarantees for FedSARSA in the presence of heterogeneity, both in local transitions and rewards, providing the first sample and communication complexity bounds in this setting. At the core of our analysis is a new, exact multi-step error expansion for single-agent SARSA, which is of independent interest. Our analysis precisely quantifies the impact of heterogeneity, demonstrating the convergence of FedSARSA with multiple local updates. Crucially, we show that FedSARSA achieves linear speed-up with respect to the number of agents, up to higher-order terms due to Markovian sampling. Numerical experiments support our theoretical findings.
toXiv_bot_toot

🚀 CfP: For all those who are interested in the development of systematic approaches and advanced technologies for handling heterogeneous, diverse and challenging humanities data:
📅 Until March 3rd you can apply for the International Workshop of Semantic Digital Humanities (@https://sigmoid.social/@semdh). This event enables a collaboration and networking across diverse fields and all members of Semantic Web, CH and DH communities.
➡️ CfP: :

"Atoms are binary. They are either intended to be hydrogen or helium. We can't just scrap this worldview just because of a handful of exceptions" 🤣
#oganesson #mentalillness
https://www.tumblr.com/teledyn/809110880047562752?source=share

February 20, 2026 -- Today, in a 6-3 decision, the U.S. Supreme Court found ... (Heather Cox Richardson/Letters from an American)
https://heathercoxrichardson.substack.com/p/february-20-2026
http://www.memeorandum.com/260221/p26#a260221p26

NASA is taking steps to potentially roll back the #ArtemisII rocket and Orion spacecraft to the Vehicle Assembly Building (VAB) at the agency’s Kennedy Space Center in Florida after overnight Feb. 21 observing interrupted flow of helium to the SLS (Space Launch System) rocket’s interim cryogenic propulsion stage: https://www.nasa.gov/blogs/missions/2026/02/21/nasa-troubleshooting-artemis-ii-rocket-upper-stage-issue-preparing-to-roll-back/ - the upper stage uses helium to maintain the proper environmental conditions for the stage’s engine and to pressurize liquid hydrogen and liquid oxygen propellant tanks; the systems worked during NASA’s Artemis II wet dress rehearsals, but teams were not able to properly flow helium during normal operations and reconfigurations following the wet dress rehearsal that concluded Feb. 19.

Start of the Dutch hydrogen backbone: Shell's 200 MW Holland Hydrogen 1 electrolyser (to be commissioned end of this year) now connected to 32 km of regional hydrogen pipeline of Hynetwork through the Port of Rotterdam.

https://www.

February 19, 2026 -- In the United Kingdom this morning, Thames Valley Police arrested ... (Heather Cox Richardson/Letters from an American)
https://heathercoxrichardson.substack.com/p/february-19-2026
http://www.memeorandum.com/260220/p44#a260220p44

March 19, 2026 -- After yesterday's revelation that the Department of Justice (DOJ) ... (Heather Cox Richardson/Letters from an American)
https://heathercoxrichardson.substack.com/p/march-19-2026
http://www.memeorandum.com/260320/p52#a260320p52