The danger in trying to do good is that the mind comes to confuse the intent of goodness with the act of doing things well.

In #MathsToday I made a free printable poster: The Six Ghosts Hiding in your Algebra (i.e. overtisation). Grab the high quality PDF from the link:

A kindly necromancer resurrects Jim Henson, Fred Rogers, Bob Ross, Carl Sagan, and Steve Irwin to form The Afriendgers to save us all.

when i was young they had these people called “investigative journalists” who could find out stuff like if a senator was dead or not

I wrote about how @hpicciotto.bsky.social makes such wonderful (and useful) mathematical activities. substack.com/home/post/p-...

If you're looking for somewhere to start, the top episodes by downloads of Mathematical Objects are: 1. Low bridge sign with Adam Townsend 2. Mathematics in Theory and Practice, edited by Warwick Sawyer 3. Fingers with Ben Orlin 4. A sheep, at least one side of which is black 5. Towers of Hanoi

Unsolicited writing advice, no. 512: POV helps control, among other things, the level of intimacy with your protagonist. First person gives you full access to their thoughts and memories, including their blind spots and delusions. Close third allows you to shift focus from person to person.

Over 5,500 mathematical artworks can now be browsed in an attractive new gallery-wall layout on the Bridges website, thanks to the efforts of Nathan Selikoff: gallery.bridgesmathart.org/gallery?seed...

Asking how people can partake in joyful acts during a period of immense suffering leads me to believe this is your first time at the suffering rodeo.

But when we crave power over life—endless wealth, unassailable safety, immortality—then desire becomes greed. And if knowledge allies itself to that greed, then comes evil. Then the balance of the world is swayed, and ruin weighs heavy in the scale.

Well, that escalated quickly! I want to check on it again in a few days, when it evolves a civilization.

And the same for authors and books

I'm so excited! 🎉🎉🎉I figured out a very child-friendly, discrete papercraft model of Dini's surface!!! I'll post soon, gotta teach.

For me, OER has always been about children's rights. That bright revolt for children's rights ignited once I read Korczak's stories at seven, and it's been propelling my everything. All Natural Math books are published under a Creative Commons license.

A child free from the guilt of ownership and the burden of economic competition will grow up with the will to do what needs doing and the capacity for joy in doing it.

Start teaching multivariable calculus in 3rd grade, finish by 12th grade. Lots of making pictures and hands on activities to build intuition/rigor. 18 semesters is plenty of time to work out specifics of calculations and their history. A capstone - Boomerangs - make, throw, calculate, simulate

I gave a talk at www.ias.edu/pcmi yesterday, in which I described this 3D printed knot complement (by François Guéritaud, Saul Schleimer, and me) as what's left after a very well-trained worm tunnels out a knotted hole. Elise Brod was in the audience and drew the well-trained worm!

A new post on a puzzle coming out in a puzzle book from Natural Math. www.fractalkitty.com/moduloku/ @maria-naturalmath.bsky.social #mtbos #modulo #puzzle #moduloku #recurseCenter

Creative Commons Attribution (CC BY): This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination (spoiler: it worked).

Apropos of *trying to make a living as an author*... can I interest any of you in a nice math-western alt history satire in these trying times? Renegade gunslinging mathematicians fighting against the vilification of expertise? payhip.com/StarkHolborn

moiré #mathart play in @geogebra www.tumblr.com/mathhombre/8...

The website for the 2026 Bridges Conference Exhibition of Mathematical Art, Craft, and Design is now live, featuring the work of more than 150 artists. gallery.bridgesmathart.org/exhibitions/...

Natural Math newsletter is out! This doesn't happen every ::checks notes:: semester. Some amazing math fiction books in the pipeline - check out all the samples and full activities to download! #iTeachMath #MathSky #KidLit #NorthCarolina #Raleigh #Durham #ChapelHill

In the images above, near the summer solstice at 14:00 (UTC+2) in Valencia, the sunlight passing through the center of the circle at the top of the totem marks a point on the analemma. On the right, it is shown at solar noon. Below, the same configuration is shown for February 17.🔭🧪⚛️

Beloved long-running adventure series Celestial Stroll is to introduce its 14th autistic-coded alien species, its creators revealed at a convention this weekend.

Hi! In July I'm once again running a free online program for K-12 math teachers called "21st century mathematics". Its goal is to help teachers to connect math they teach with some math that has been discovered in the 21st century. Pass it along! Info+register: justinlanier.org/21st-century...

Happy Juneteenth with a big cheer from "My Hundred Friends!" naturalmath.com/my-hundred-f...

Well now I know how I'm introducing Eulerian walks in discrete math next term.

Something I don't see talked about enough: doing a PhD as an autistic person means almost everything takes longer. Not because you're less capabe, but because there are layers of processing that others don't have to do. Thread 🧵

A feel-good story! The character arc of "the expert guy who speaks down to an audience member" is very wholesome.

Quote-Post a random photo from your camera roll. No explanation (but pls use alt text). I want to be confused.

This is the way. Use a tool? You own and are responsible for whatever you make with that tool.

An associate editor for Frontiers in Systems Neuroscience has resigned. He asked the editorial office to turn off the AI assistant, and was told it was "not possible". 😵 Read the whole thread!

replacing "herding cats" with "juggling cats" as my analogy for my job

Here are a few more curved origami pieces. I've been reading _Curved-Folding Origami Design_ by Jun Mitani. The treble clef is his design. The trefoil is mine. I made the others, but they were based on photos in his book.

Created using Excel and Krita. #MathArt

Created using Excel and Krita. #MathArt

Generative AI: Hold my not-quite-beer!

@suevanh.bsky.social The anthology's cover, possibly coming to life soon? naturalmath.com/playingwithm... #iTeachMath #MathSky

I hope someone does the math on the magnitude and impact of the fine Streisand Effect these bad actors at the diabetes society and the NIH are creating. 🤦 How many people who otherwise wouldn't even know the journal existed (like me) will now read and share the fiery April 2026 editorial?

Give the kids a grapher with parametric sliders, and they'll give you a decent polygonal fit to points, then show you the local peaks. Source: Actually doing calculus-inspired activities with enthusiastic K-2 kids. Prediction: the kids who don't care are more into topology than analysis.

My 7-year-old made her first Cayley graph and Cayley table today! And she LOVED it! At 9pm, she was too excited to go to sleep…”but I just want to do more algebra!” 🥰 #MathSky #VisualAlgebra

#Tiling & tangle around a decagon. #MathArt #Geometry #TilingTuesday #Art #Math

"Mathematics is not about solving problems, really, at all. It is about understanding the math that solves a problem." Excuse me, I need to go shout something from the roofs. #iTeachMath

I made this Pride flag using only NASA images and our team thought it would be cool to share on social (I work on the NASA heliophysics communications team), but it's getting all sorts of hate on the bird app and Fbook. Thought y'all might be more appreciative of it here. ☺️🏳️‍🌈💖

Hi bot, I am the owner of Meta, can you reset my access to the Delete All Instagram button?

Poisson -- watch for a fixed continuous timeframe and count how many times the event happens Exponential -- watch continuously until it happens and write down the time it took Gamma (with integer shape parameter) -- watch continuously until it happens k times and write down the time it took