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So....there's a panel that comes off fairly easily with minimal effort, you say? For no particular reason, which one?

submitted 8 days ago • 0 comments

I've been learning how to use @jaapsch.net's PolySolver more effectively lately. I previously tried manually to get symmetrical markings on a tiling with the 12 internal-edge-marked pentiamonds, but had to give up just short. This time I had PolySolver's help. #TilingTuesday

submitted 10 days ago • 0 comments

holy shit. in a world of Schumers be a McGee.

submitted 12 days ago • 695 comments

Yesterday was the 57th anniversary of the My Lai massacre. I don't think there has been a time where Hugh Thompson Jnr's behaviour, and his actions that day, have been more relevant to US history than they are right now.

submitted 11 days ago • 24 comments

7 sets Venn Diagram 128 color combinations from mixing 7 colors by Santiago Ortiz #🧮 moebio.com/research/sev...

submitted 11 days ago • 0 comments

#MathArtMarch day 17, “symmetry”. Here are the 11 symmetries of regular dodecagons you can make with classic pattern blocks (D12, D6, C6, D4, C4, D3, C3, D2, C2, D1, C1). #TileFarm #Dodecagon #PatternBlocks #iTeachMath #Symmetry

submitted 11 days ago • 0 comments

you know how i keep harping on the mayor's comp plan limiting density to arterials? this is the filter on a passivhaus over a block off MLK. the dirty one was replaced 24 february. 20 days. the white one is what it looks like brand new. due to road particulates, needs to be changed monthly.

submitted 12 days ago • 17 comments

THIS IS HUGE! Researchers at Cornell University have developed a new thermostable, MULTI-TARGET vaccine platform that offers stronger, longer-lasting protection against SARS-CoV-2 AND influenza while providing broader immunity against VARIOUS flu strains. 🧪🧵⬇️

submitted 15 days ago • 83 comments

Joe O’Rourke—Venusian parabolas tend to face west due to the prevaling winds, but older parabolas are misaligned. Perhaps Venus itself reoriented! #LPSC2025

submitted 14 days ago • 6 comments

Random hitomezashi patch. It has two mistakes, at least. But it’s doing its job as a patch perfectly. #mathart #embroidery #sashiko

submitted 14 days ago • 1 comment

Portland folk — come to Reed this Thursday for math, democracy, and civil rights!

submitted 18 days ago • 1 comment

The 16 one-stripe tetrominoes have area 64; we'd like to put them in an 8×8 square. But the stripe length doesn't come out to a multiple of 8, so we can't make it work. Unless we cheat. Here, there are a few positions where stripe continuity is broken to let another stripe pass. #TilingTuesday

submitted 17 days ago • 0 comments

New blog post on polyforms with a single stripe: puzzlezapper.com/blog/2025/03...

submitted 18 days ago • 0 comments

#MathArtMarch #maps? I might have a few of those. Tea for Eight, 2010. My first solo #mathart exhibition piece. Eight countries all border each other, which requires two handles. The linked page connects to my 2014 Bridges paper on the design process. faculty.smcm.edu/sgoldstine/g...

submitted 18 days ago • 1 comment

We’ve looked at snails with one shell and slugs with no shells. Now let’s have a look at a snail with two shells, because Nature laughs at our puny attempts to pigeonhole. In today’s #AtoZ – J is for Julia (Juliidae) (1/9) Pic: © uwkwaj CC BY-NC

submitted 19 days ago • 20 comments

A few days ago it was pancreatic cancer. There are some incredible immunotherapies in the pipeline right now. Kind of a shame that my country voted for a war on medical research.

submitted 26 days ago • 0 comments

There are 13 ways to put a bump on one hex of a dihex and a divot on the other. One of them (in red) can't be on a path. The other 12 can make a loop on this figure in exactly one way, up to symmetry/reversal. After I drew this I saw that Alexander Magyarics used the same result in a recent puzzle.

submitted 31 days ago • 1 comment

The 16 single stripe tetrominoes don't make anything very elegant by themselves, but if you throw in a pair of unstriped trominoes, you can make a rectangle. #TilingTuesday

submitted 31 days ago • 0 comments

Pausing my doomscroll to post some more #mathart. This jewelry set exhibits a theorem that Ellie Baker and I proved about what symmetries are compatible with bead crochet. Biggest WIP now: the second edition of our bead crochet book. #beadcrochet #crochetsky 🧶 faculty.smcm.edu/sgoldstine/g...

submitted 35 days ago • 1 comment

Dear manager: 1: I had a piña colada 2: I got caught in the rain 3: I tried yoga (was not into it) 4: I tried champagne (was) 5: Um, this one is not really work appropriate, but it turns out it's true what they say about the sand getting everywhere, it was incredibly hot, but would not try again.

submitted 33 days ago • 0 comments

youtube just reminded me of one of the most bizarre videos i've ever seen, where a guy says "i can sense moles underground" and then shoves his hand into the dirt and pulls out a mole

submitted 44 days ago • 65 comments

A puzzle for #TilingTuesday: These pieces are all of the ways you can put one stripe bisecting opposite hex sides on a trihex. The challenge is to put the pieces in the frame so that the stripes make continuous lines from one edge of the frame to the other.

submitted 45 days ago • 1 comment

NEW: A group known as the 'puppygirl hacker polycule' has leaked thousands of police training & policy manuals from departments across the country www.dailydot.com/debug/lexipo...

submitted 45 days ago • 257 comments

Gotta share this incredible photo of two Bald Eagles perched on the Seattle Post-Intelligencer globe. 📸Karyn Abercrombie

submitted 51 days ago • 20 comments

Okay, got it fast enough to create Video! Februar Theme is Hyperbolic Fractal! Here I render a chunk of a Hyperbolic honeycomb and then color the pixels depending on how many faces we pass through in that direction. I think there is something wrong on the right, not sure... #hyperbolic #mathart

submitted 52 days ago • 1 comment

The Nerdabteilung is really getting out of hand.

submitted 54 days ago • 0 comments

For no particular reason, here is Diego Rivera's "The Temptation of Saint Anthony". National Museum of Art, Mexico City.

submitted 54 days ago • 1 comment

It's kind of fun that the three main varieties of kale represent the three types of surface geometry (negatively curved, positively curved, and flat).

submitted 54 days ago • 0 comments

They should let Jared Keeso announce the retaliatory tariffs in character as Shoresy youtu.be/qBWEOSyAktU?...

submitted 55 days ago • 7 comments

The answer (in part) = “Dutch drivers pay far more tax if they have a heavier car. The idea is to penalise those vehicles which most contribute to causing the potholes to help pay for the roads.”

submitted 59 days ago • 15 comments

I'm giving a colloquium talk on Thursday at 1PM AKST to my department on some recent joint work. partSummary: an important class of geometric (n_4) configurations turn out to be movable! and have fascinating conic connections! It's an amazing result! email/DM me if you want a zoom link. #mathsky

submitted 59 days ago • 3 comments

Let's recap the timeline for those of you who haven't been following. Friday: a deportation flight containing 88 Brazilians takes off from American soil. The deportees are handcuffed and bound in leg irons, as is standard practice on such flights. The Americans are flying into a trap.

submitted 61 days ago • 42 comments

You know what is, to me, a modern cathedral? A flagship science mission spacecraft. 100% hand built, utterly unique, labored on by thousands, made with precious materials, lodged in people’s hearts forever even if they never see it again, producing awe and inspiration.

submitted 61 days ago • 12 comments

Clear-eyed, evidence-based, historically inspired hope is my favorite kind.

submitted 66 days ago • 0 comments