Tootfinder

Related to understanding firearms, "rifles" and hand guns tend to be rifled. Rifling is grooving that runs in a helical pattern down the barrel. When purchasing a firearm, it's important to check the rifling.
First check that the firearm is unloaded. Empty or remove the magazine, cycle the weapon. Next, check again that it's unloaded by looking both down the barrel and into the magazine. Now, shine a light down the barrel and look down it. In the absence of a light, you may be able to reflect light off your thumbnail.
Rifling should look as though it's drawn on with a sharp pencil, and the barrel should look otherwise completely smooth and clean. If the rifling looks like bumpy mountains, then the owner probably used corrosive ammo and didn't clean it enough. It will probably still shoot, but not at all accurately.
Both the rifling and the pin can be used in forensic analysis to match a bullet to a gun. I don't honestly know how accurate this is because a lot of forensic "science" is just made up stuff that relies on the CSI effect and doesn't actually work as advertised.
However, not all firearms are not all rifled. Shotguns are "smoothbore" firearms, meaning they lack rifling. It is not possible to perform forensic analysis of a smoothbore firearm. It *is* possible to check for powder on the hands of someone who has used a firearm within the last few days, but it's not possible to distinguish between firing inside and outside a range.
I've been gathering all kinds of tidbits like this, partially just out of curiosity and partially because I've been wanting to write a story about a revolutionary group fighting a modern authoritarian society. I'm always happy to learn other bits, if anyone has anything else I could throw in my narrative (whenever I finally get back to writing it).

Google launches its AI-powered ad tools in India; the country repealing its so-called "Google Tax" boosts its appeal to global tech companies selling online ads (Jagmeet Singh/TechCrunch)
https://techcrunch.com/2025/07/09/goog

Google brings its AI-powered marketing tools to India after 'Google tax' repeal | TechCrunch
Google has launched a suite of its AI-powered advertising tools in India, which debuted in the U.S. in May, as the repeal of the so-called "Google tax"

Google launches its AI-powered ad tools in India; the country repealing its so-called "Google Tax" boosts its appeal to global tech companies selling online ads (Jagmeet Singh/TechCrunch)
https://techcrunch.com/2025/07/09/goog

Google brings its AI-powered marketing tools to India after 'Google tax' repeal | TechCrunch
Google has launched a suite of its AI-powered advertising tools in India, which debuted in the U.S. in May, as the repeal of the so-called "Google tax"

So yes, BlueSky finally has bookmarks.
Before this feature came out, people had simply been replying to posts with a 📌 emoji and there was a dedicated feed where you could view your 📌’ed posts.
In an example of how to roll stuff out, someone made an importing tool that either moved OR copied your 📌 posts to bookmarks (saved posts)
VERY well done.

Bluesky (@bsky.app)
v1.108 is rolling out today 🚚 Now live, at long last: Bookmarks, aka Saved Posts. For all those posts you'll definitely plan to come back to! Update the app and give it a try. The button is right down there 👇

Asymptotic Normality of Infinite Centered Random Forests -Application to Imbalanced Classification
Moria Mayala (LPSM), Erwan Scornet (LPSM), Charles Tillier (LMV), Olivier Wintenberger (LPSM)
https://arxiv.org/abs/2506.08548

Asymptotic Normality of Infinite Centered Random Forests -Application to Imbalanced Classification
Many classification tasks involve imbalanced data, in which a class is largely underrepresented. Several techniques consists in creating a rebalanced dataset on which a classifier is trained. In this paper, we study theoretically such a procedure, when the classifier is a Centered Random Forests (CRF). We establish a Central Limit Theorem (CLT) on the infinite CRF with explicit rates and exact constant. We then prove that the CRF trained on the rebalanced dataset exhibits a bias, which can be r…

Balancing Fixed Number of Nodes Among Multiple Fixed Clusters
Paritosh Ranjan, Surajit Majumder, Prodip Roy, Bhuban Padhan
https://arxiv.org/abs/2506.08715

Balancing Fixed Number of Nodes Among Multiple Fixed Clusters
Cloud infrastructure users often allocate a fixed number of nodes to individual container clusters (e.g., Kubernetes, OpenShift), resulting in underutilization of computing resources due to asynchronous and variable workload peaks across clusters. This research proposes a novel system and method for dynamic rebalancing of a fixed total number of nodes among multiple fixed clusters based on real-time resource utilization thresholds. By introducing a Node Balancing Cluster Group (NBCG), clusters …

First-principles approach to ultrafast pump-probe spectroscopy in solids
Lu Qiao, Ronaldo Rodrigues Pela, Claudia Draxl
https://arxiv.org/abs/2509.07612 https://

First-principles approach to ultrafast pump-probe spectroscopy in solids
Pump-probe spectroscopy is a powerful tool to study ultrafast exciton dynamics, revealing the underlying complex interactions on the electronic scale. Despite significant advances in experimental techniques, developing a comprehensive and rigorous theoretical framework for modeling and interpreting the transient response in photoexcited materials remains a challenge. Here, we present a first-principles approach to simulating pump-probe spectroscopy and disentangling the electronic and thermal c…

The GSA says Oracle is giving the US government a 75% discount on its license-based software and a "substantial" discount on its cloud service through November (Belle Lin/Wall Street Journal)
https://www.w…

OpenAI is providing its tools and computing resources for an AI-made animated feature film called Critterz, which is set to hit theaters globally in 2026 (Jessica Toonkel/Wall Street Journal)
https://www.wsj.com/tech/ai/openai-backs-a

OpenAI is providing its tools and computing resources for an AI-made animated feature film called Critterz, which is set to hit theaters globally in 2026 (Jessica Toonkel/Wall Street Journal)
https://www.wsj.com/tech/ai/openai-backs-a