“What if you held a tree long enough for it to grow around your hand?” For a piece called It Will Continue to Grow Except at That Point, Giuseppe Penone fitted a cast of his hand to a growing tree and the tree grew around it for more than a decade. [kottke.org]

uh holy SHIT?

went back and grabbed the full video of her intro. absolutely incredible 🇮🇹🍝👩‍🍳🤌🇮🇹🍝👩‍🍳🤌🇮🇹🍝👩‍🍳🤌🇮🇹🍝👩‍🍳🤌

Anyone at #JMM2026 interested in starting the year with an #illustratingMath project? Don't worry, @mathgrrl.com has you covered, see information below and go create some #MathArt!

hello EVERYBODY remember to GENUARY !!! tomorrow starts DAY 1 of GENUARY, the generative art month -- we have prepared 31 unique code based daily prompts for you (specifically for you) (yes you) #generative #genartclub #genuary2026 #genuary

Excited to share the below announcement for our new app at pretext.plus -- author PreTeXt in your web browser, no GitHub required! Join the @mathtech.org Discord chat to grab an invite code: first come, first served! pretext.plus/projects/80f...

The review has finished but it seems like Play Store doesn't automatically invite testers. So here is the link for registered testers to join from Android: play.google.com/store/apps/d... or from web: play.google.com/apps/testing...

It's a new day for NYC. Happy new year, friends and comrades. Let's tax the rich, win childcare for everyone, and build even more organization and governing power for the Left in 2026.

It's pretty hard to follow up to cool number years like (20 + 25)² = 2025, but I hope you have a great start to 2¹¹ - 2·11 = 505 + 506 + 507 + 508 = 2026. Happy new year! 🥂🍾🎉 (Bonus fun fact: 2026 is the number of disconnected 4-regular graphs on 17 vertices, via oeis.org/A033483 🧐) #mathsky 🧮

Here's how the "Quantum Randomness Hitomezashi" embroidery is going so far. Finished the first 6 rows on the x axis, starting 0,1,1,1,0,0,etc. These positions were generated by the first two pulses from @colorado.edu's quantum randomness beacon. #generativedice

Digit Party just went over 1000 days! Robert Brignall and I celebrated by redesigning the whole thing. Place digits, match neighbors. 🟧🟧⬜⬜🟥 ⬜🟧🟧🟥🟪 ⬜⬜🟥🟪🟫 ⬛🟥🟫🟫🟫 ⬛⬛⬛🟫🟫 day 1001: 146 points 66% digit.party

Cool! The circles in an Apollonian Gasket can all have an equation of the form (n|x|-a)² + (n|y|-b)² = 1, where n is a positive integer, and a & b are non-negative integers < n. www.desmos.com/calculator/6... #MathSky #iTeachMath

EXCLUSIVE: @zohrankmamdani.bsky.social will be sworn in as mayor on midnight on January 1 inside the old abandoned City Hall subway station, saying that he sees the venue as a symbol for the aims of his upcoming administration.

When my father-in-law made another comment about $100k tuition, I made him look up tuition at his undergrad institution, Indiana State Evansville (~$15k before aid if you live at home like he did). And then told him that, like him, most college-goers attend within an hour of home.

It's Fractal Friday! This is "Billowing Vapor": "Perhaps the whispers could have been avoided. Were circumstances different, the red haze wouldn't fill the skies, wouldn't drown the stars." #fractal #fractalart #mathart #digitalart #art

If most people active in electoral campaigns thought about campaigns the way @greenbackbetter.bsky.social does here, we could run many more campaigns knowing that we would lose most of them in terms of immediate electoral outcomes but still keep building power so that, one day, we win most of them.

Traveling north late Friday? Might want to change plan. In addition to ice potential near here, zone of moderate to heavy snow northern Mid-Atlantic to parts of NY/New England. ❄️❄️❄️ Winter storm watch NYC -- half a foot or more forecast there. Details @ cwg.live.

BREAKING: Instacart is ending all price testing on its platform in the wake of this report.

The continued erasing of tenure goldengatexpress.org/114511/campu...

You've officially made it to the end of the Fall 2025 semester. ☑ Congratulations! 👏 🥳 Time for a well-earned break. 💤

The New York City Transit system has thousands upon thousands of informational signs installed across the city! Step inside our sign shop for an inside look at how these signs are designed, fabricated, and put into place.

a lot of people are aware that you can factor 2025 = 45² i'm honored to announce the factorization 2026 = (45-i)(45+i)

Aurora Borealis or something, I don't know, I'm not a Meteorologist. #creativecoding

Russia could attack Estonia through rapid invasion to capture Narva or a hybrid Crimea-style annexation with disinformation and special forces, European Council on Foreign Relations reports. Both scenarios would end in strategic disaster for Moscow. ecfr.eu/publication/...

Final call for Christmas orders. If you order today select UPS 2nd day or next day service. I will ship it Monday morning n-e-r-v-o-u-s.com/shop/

Amazon is helping fund a $300 million build of a ballroom for the White House. Independent bookstores are donating to food banks and organizations that help with food insecurity. They are not the same.

Blows my mind it hasn't even been a full year of congestion pricing in NYC yet. Years of cranks whining about it and then you just DO IT and everything is instantly better and everyone gets used to it and moves on. We should do good things more often! PS - T-minus 12 days to Streets Mayor Mamdani!

This looks interesting. "The Incubator is intended to help start in-person, not-for-profit summer programs (residential or non-residential), at which participants do intensive mathematics with a focus on enrichment rather than remediation or acceleration" summermathprograms.org/incubator#in...

Honestly great news, but shame on the Senate + Assembly for letting it get this far.

We should figure out how to create a similar type of assignment for math students. What would that look like?

Evidence points me toward a main culprit - and it's not what's being discussed in many of the stories about UCSD. Read my latest Math Values post: Students are Struggling. Why? 2/2 maa.org/math-values/...

thank you. A more dev oriented version of it, is already online: meodai.github.io/poline/

Here is a nice pattern

I was just saying last night to my mate Andy Parry that we'd have had to get out our bendy bits of rubber back in those days to prepare an image like this from his new paper.

This graph.

*slams fists on table* there was a two for one sale at the fist store

The points attack is actually unstoppable as far as I can tell. If someone gets your credit card details and adds it to an Amazon account it gives them direct access to the points. They made dozens of Amazon purchases (gift cards?) using my points balance. Not even an email from the bank about it.

This is incredible (good news too): “After a 40% fall in 2024 in battery equipment costs, it’s clear we’re on track for another major fall in 2025…The economics for batteries are unrecognizable, & the industry is only just getting to grips with this new paradigm” www.pv-magazine.com/2025/12/12/b...

Tax the Rich Field Team Forest Hills! Neither freezing temp nor bus delays stopped us from fulfilling our mission to do field to fund childcare. For this inaugural field weekend, the campaign knocked ~15k doors and collected 1k constituent letters citywide. Join the effort: act.ourtime.nyc/sign-up

Inspired by a zoom talk on Escher-like Spiral Tiling yesterday by @isohedral.ca, wrote some code that's probably not quite working right but it's still pretty fun... Here, the starting tile is a small symmetric Turing Pattern with a little color added. #mathart

An aperiodic tessellation of the hyperbolic plane, found by Toimine in the #tessellations channel in the HyperRogue discord. These tiles have edge length of 0.56358, less than the previous record for a equilateral convex tile (0.56626, achieved by the regular {7,3} tiling).

My pizza game was strong tonight!

Morning chat: Kiddo: 1 2 3 4 5 6 7 8 10 Me: Wait, where's 9? Kiddo: 9 is causing some DRAMA

"Gamma is a blight, a curse, and utterly annoying. [...] Gamma does to digital colour what kerning does to typography" .. I wrote some notes (and hints) on Gamma: poniesandlight.co.uk/reflect/gamma/

Indiana’s Senate has voted AGAINST the GOP gerrymander that’d have locked in a 9-0 map. This keeps the 7-2 map in place, saving two Democratic seats heading into 2026. The vote failed big, 19/31. The MAJORITY of the GOP senators opposed it!

New #MathArt drop for anyone that cannot see the exhibit at JMM (spoilers for those who go).

Heading to the #MSCHE Conference in Philadelphia. Provost Patricia Price, Associate Provost Rebekah Chow, and I will be presenting "Accreditation for the Rest of Us" Thu 12/11 9am, where we share lessons learned over the past 2.5 years. @queenscollegecuny.bsky.social represent! Feel free to say hi.

Chad Hagen's nonsensical infographics more: chadhagen.com/nonsensical-...

It's not just that Colorado have decided to go to the moon. It's also striking how the other teams have spread out so much less than you'd expect.