Tootfinder

Substack raised $100M from the Chernin Group, a16z, and others, sources say at a $1.1B valuation, as it builds a social network and focuses on advertising (New York Times)
https://www.nytimes.com/2025/07/17/business/substack-fundraising-social-network.htm…

Substack Raises $100 Million, Betting on Subscriptions but Coming Around to Ads
Substack, originally a newsletter service, says its app now has millions of users interacting with its creators.

Substack raised $100M from the Chernin Group, a16z, and others, sources say at a $1.1B valuation, as it builds a social network and focuses on advertising (New York Times)
https://www.nytimes.com/2025/07/17/business/substack-fundraising-social-network.htm…

Substack Raises $100 Million, Betting on Subscriptions but Coming Around to Ads
Substack, originally a newsletter service, says its app now has millions of users interacting with its creators.

Ferrexpo's Ukrainian mining subsidiary executive charged with $41 million tax evasion scheme: https://benborges.xyz/2025/07/18/ferrexpos-ukrainian-mining-subsidiary-executive.html

@… https://robynhitchcock.substack.com/

Robyn Hitchcock | Substack
Surrealist rock ‘n’ roller, troubadour, guitarist, poet, painter, and performer. 1967: How I Got There And Why I Never Left is out now on Little, Brown (UK) and Akashic Books (USA)

On connected graphs with finite spectral redundancy index and Pythagorean triplets
Pawan Kumar, S. Pirzada, S. Merajuddin
https://arxiv.org/abs/2507.11555 …

On connected graphs with finite spectral redundancy index and Pythagorean triplets
This article investigates spectral redundancy, a concept initially introduced by Alberto Seeger. Spectral redundancy arises when different connected induced subgraphs of a graph share the same spectral radius in their adjacency spectrum. Let \(b(G)\) denote the total number of non-isomorphic induced subgraphs of \(G\), and \(c(G)\) represents the cardinality of the set of spectral radius of all connected induced subgraphs of \(G\). The spectral redundancy of a graph \( G \) is defined as the ra…

Self-Adaptive and Robust Federated Spectrum Sensing without Benign Majority for Cellular Networks
Ngoc Duy Pham, Thusitha Dayaratne, Viet Vo, Shangqi Lai, Sharif Abuadbba, Hajime Suzuki, Xingliang Yuan, Carsten Rudolph
https://arxiv.org/abs/2507.12127

Self-Adaptive and Robust Federated Spectrum Sensing without Benign Majority for Cellular Networks
Advancements in wireless and mobile technologies, including 5G advanced and the envisioned 6G, are driving exponential growth in wireless devices. However, this rapid expansion exacerbates spectrum scarcity, posing a critical challenge. Dynamic spectrum allocation (DSA)--which relies on sensing and dynamically sharing spectrum--has emerged as an essential solution to address this issue. While machine learning (ML) models hold significant potential for improving spectrum sensing, their adoption …

Sources: Substack is pitching investors on a round between $50M and $100M that would value it above its ~$700M last round price, and is generating ~$45M in ARR (Eric Newcomer/Newcomer)
https://www.newcomer.co/p/scoop-substack-in-talks-to-raise

SCOOP: Substack in Talks to Raise Financing as It Taps Into the Zeitgeist of Trump II
Substack is generating about $45 million in annual recurring revenue: sources

An Atlas of Spectroheliograms from 3641 to 6600 \AA
P. V\'aradi Nagy, A. G. M. Pietrow
https://arxiv.org/abs/2507.13025 https://a…

An Atlas of Spectroheliograms from 3641 to 6600 Å
We present a spectral atlas of solar spectroheliograms covering the wavelength range from 3641 to 6600 Å, with continuous coverage between 3711 and 5300 Å, and sparser coverage beyond this range. The spectral resolution varies between R $\sim$ 20 000 and 40 000, with a spectral step size between 60 and 90 mÅ, while the spatial resolution averages around 2.5 arcseconds. These observations were acquired over three months during the 2025 solar maximum, using amateur spectroheliographs (Sol'Ex a…

Sources: Substack is pitching investors on a round between $50M and $100M that would value it above its ~$700M last round price, and is generating ~$45M in ARR (Eric Newcomer/Newcomer)
https://www.newcomer.co/p/scoop-substack-in-talks-to-raise

SCOOP: Substack in Talks to Raise Financing as It Taps Into the Zeitgeist of Trump II
Substack is generating about $45 million in annual recurring revenue: sources

Location sharing apps like Find My, Snap Map, and Life360 remain popular among Gen Z users, despite concerns about their impact on real-world relationships (Summer Maxwell/SFGATE)
https://www.sfgate.com/tech/article/gen-z-spying-on-each-other-20764888.php…