Tootfinder

On the best constant in the finitary Vitali covering lemma for high dimensional cubes
Gian Maria Dall'Ara
https://arxiv.org/abs/2510.06817 https://arxi…

On the best constant in the finitary Vitali covering lemma for high dimensional cubes
Let $Γ_d$ be the largest constant such that every finite collection of cubes in $\mathbb{R}^d$ whose sides are parallel to the coordinate axes admits a disjoint sub-collection occupying a fraction $Γ_d$ of its volume. Vitali's greedy algorithm shows that $Γ_d\geq 3^{-d}$, and cutting a cube into its $2^d$ dyadic sub-cubes gives $Γ_d\leq 2^{-d}$. The question of determining the value of $Γ_d$ was first raised by T.~Radó in a 1927 letter to Sierpinski. In this paper we investigate the asy…

Spotify says founder Daniel Ek will become Executive Chairman effective January 1, 2026, replaced by CPTO Gustav Söderström and CBO Alex Norström as co-CEOs (Spotify)
https://newsroom.spotify.com/2025-09-30/spotify-announcement-daniel-ek-executive-c…

Spotify Announces Leadership Evolution: Daniel Ek to Become Executive Chairman, Alex Norström and Gustav Söderström to Become Co-CEOs in January 2026 — Spotify
The following press release went live on Business Wire earlier today. You can also find more detail here in Founder & CEO Daniel Ek’s letter to employees. Stockholm and New York — 30 September, 2025 Today, Spotify (NYSE: SPOT) announced that Founder and Chief Executive Officer Daniel Ek will transition to the role of Executive...

Derk Sauer, a Dutch media entrepreneur who founded The Moscow Times and later supported Russian journalists in exile, died at 72 from sailing accident injuries (The Moscow Times)
https://www.themoscowtimes.com/2025/07/31/

Derk Sauer, Moscow Times Founder and Dutch Media Entrepreneur, Dies at 72
Derk Sauer, the Dutch media entrepreneur who founded The Moscow Times, died on Thursday at age 72, his family said in a statement.

As the Trump administration cracks down on both environmental policies and progressive activism,
the Sunrise Movement,
the youth-led climate justice organization that popularized calls for a Green New Deal,
is widening its mission to fight authoritarianism.
“Every day, Donald Trump is seizing power and shredding the Constitution,”
Sunrise’s executive director, Aru Shiney-Ajay,
wrote in an open letter to Sunrise members, funders and allies.
“What ordi…

Here’s what the “just let tech bros run everything” crowd fundamentally misunderstands about how innovation actually works: It requires exactly the kind of chaotic, unpredictable, open ecosystem that authoritarianism systematically destroys.
Real innovation happens when companies have to compete on merit, not on who can kiss the leader’s ass most effectively. In a functioning democracy with actual rule of law, the best products have the opportunity to win. In an authoritari…

Fascism For First Time Founders
Over the last year or so I’ve seen a disturbing tendency in tech/startup/VC worlds to buy into the neoreactionary view that for startups to be successful they need to get on board the Trump t…

Uber acquihires Belgian data labeling startup Segments.ai to expand its lidar data labeling capabilities; its founders and staff will join Uber AI Solutions (Natalie Lung/Bloomberg)
https://www.bloomberg.com/news/articles/2025-10…

Spotify says founder Daniel Ek will become Executive Chairman effective January 1, 2026, replaced by CPTO Gustav Söderström and CBO Alex Norström as co-CEOs (Spotify)
https://newsroom.spotify.com/2025-09-30/spotify-announcement-daniel-ek-executive-c…

Spotify Announces Leadership Evolution: Daniel Ek to Become Executive Chairman, Alex Norström and Gustav Söderström to Become Co-CEOs in January 2026 — Spotify
The following press release went live on Business Wire earlier today. You can also find more detail here in Founder & CEO Daniel Ek’s letter to employees. Stockholm and New York — 30 September, 2025 Today, Spotify (NYSE: SPOT) announced that Founder and Chief Executive Officer Daniel Ek will transition to the role of Executive...

The fundraising letter I got from #NYPL (New York Public Library) this week has some fantastic news:
They are raising money because of “book checkouts doubling and tripling at some branches”.
People are READING!
People are continuing to read, despite the popular narrative that everyone just wants to sit scrolling video feeds and chatting with bots all day. People want books, people have the attention span to read them, and at the very least some libraries are thriving.
Have hope in people!
#libraries #books #bookstodon #GoodNews #positivity #NYC

@… Regarding the Republicans upset at being reported as unknown senders https://daringfireball.net/linked/2025/07/28/nrsc-letter-ios-26…

Republican Election Group Is Attempting to Organize Against Text Message Filtering in iOS 26
Link to: https://politicalwire.com/2025/07/28/republicans-say-apple-update-will-hurt-fundraising/

Ben & Jerry’s co-founder Jerry Greenfield is leaving the ice cream brand after 47 years, saying that
the independence it once had to speak up on social issues has been stifled by parent company Unilever
https://apnews.com/article/ben-jerrys-

Why Jerry Greenfield is leaving Ben & Jerry's after 47 years
Ben & Jerry’s co-founder Jerry Greenfield is leaving the ice cream brand after 47 years, saying the freedom the company used to have to speak up on social issues has been stifled by corporate parent Unilever. Co-founder Ben Cohen posted Greenfield's letter on social media platform X on Greenfield’s behalf. Greenfield said that he felt the independence the brand had to speak on social issues and events was lost to Unilever.