It's not a takedown!

We were invited to read from our books, which I did of course. But first I had some opening words, which I thought I'd share with you here. I'll share video too, once that's available.

The next episode of the Mathematical Objects podcast, in which we chat to the lovely @nhoskee.bsky.social about what objects we consider mathematical, and why, is out now!: aperiodical.com/2026/01/math...

New podcast episode! @steckl.es and I have an interesting chat about maths, what it is, and how to communicate that, with @nhoskee.bsky.social inspired by the Public Math 'certified mathematical object' stickers. aperiodical.com/2026/01/math...

As pointed out by @paulakrieg.bsky.social and noted by @mpershan.bsky.social, longtime #mtbos partner and collaborator Malke Rosenfeld passed away last year. She investigated and taught the mind-body math connection, engaging hundreds of teachers and learners in #mathart - dance! RIP great friend!

2:30 PM PT / 4:30 PM CT

Doing some preparation for #vehiclechat LIVE (with special guest @triangleman.bsky.social) and wondering why we have not domesticated giraffes... SEE YOU FRIDAY 2 PM PT / 4 PM CT www.instagram.com/nhoskee?upco...

This one is especially for the teachers who are teaching the week of Thanksgiving. #VehicleChat for Google Slides. A seriously silly conversation, perfect before a holiday. docs.google.com/presentation...

New Blog Post: Culture & Identity in the Math Classroom How do elements of the culture students bring into the classroom interact with the classroom culture we create? What does it mean to shift or honor them?

I say we rename it the Fibonacciii sequence

Wait hold up, a square is a rhombus but not all rhombi are squares

yeah... we have to revolt www.washingtonpost.com/technology/i...

Was very excited to enjoy this pint of ice cream while watching Frankenstein. Unfortunately it's not a movie that really gets the appetite going...

❤️ Love this ❤️ @mathforge.org has done what I’ve never been organised enough to do myself, and catalogued every #geometrypuzzle I’ve ever posted on social media. It looks amazing!

Okay, so I’m currently in a fourth grade class starting a new unit. The teacher asked them to brainstorm measurement tools. Usually we just get things like “ruler.” This class is going in totally different directions!

S/O to my friend’s dad for Day 17 of #vehiclechat

Excerpt from Living a Fruitful Life by Frank Oppenheimer. "In thinking about my life, I arrived at some ideas about what was necessary for a fruitful life.

Imagine 4 randomly placed points. Is it more likely that the quadrilateral formed by these points is concave or convex? Or is the probability of either outcome the same?

Are there more quadrilaterals than triangles?

I had fun joining @peterrowlett.net and @steckl.es recently on their mathematical objects podcast, talking about my wood puzzle collection. Most of the time was spent struggling desperately to describe a highly visual topic in an audio-only context. open.spotify.com/episode/0rRM...

If you are on the Gram, make sure you’re following @nhoskee.bsky.social over there so you can play #vehiclechat with the big goofy community he’s been building over there.

NCTM is next week and if you pay me a cool $20 I'll get those slides nice and fixed up for you

Graph Time with Sara and Sean is here! On today's episode we try to recreate the vibe of one of the first graphs that ever inspired Sean in Desmos. Watch us play with math and maybe learn a thing or two about graphing along the way! www.youtube.com/watch?v=KQiM... #desmos #iteachmath #graphart

new viral math

remember when google images was so good?

Holy crap this is such good math art youtu.be/rdSgqHuI-mw?...

The regular TSA line is moving faster than the TSA pre check line, and I now know what the French Revolution felt like

I have been posting a series of approximately equal statements on instagram…

Minnesota's Largest Pattern Block Mosaic! talkingmathwithkids.com/blog/minneso...

Would you pay for a service where I look at your upcoming conference slides and give them a glow up?

Hey check this out!!

Nude Descending a Staircase (No. 3) www.desmos.com/calculator/q...

www.youtube.com/watch?v=-PdY... #artmath

This death metal inspired MATHEMATICS design would go incredibly hard on a shirt

PROOF and POOF are just one letter apart

Would you rather be super useful or super useless?

I’m grateful to be able to help teachers and districts through coaching and other support. I still have some room for other districts. It can be local or national, in person or remote. I support K-8 with math instruction and/or curriculum materials. 😍 www.foresteducationconsulting.com

I really hope people enjoy reading this as much as I enjoyed writing it. It's a retellilng of the battle between Tartaglia and Cardano over the cubic. pershmail.substack.com/p/who-gets-c...

To whittle a spoon you must keep whittling

n H O

This week’s #MathPhoto25 prompt is #even. Where do you see things that come in pairs? Where do even numbers show up in your world—on signs, in patterns, or in nature? #ITeachMath

I approve of referring to @triangleman.bsky.social and I as "the Chris's"

Today at a party I claimed to be able to do magic and baffled everyone by miraculously naming someone’s selected card. I just randomly guessed. This is the closest I have felt to the power of mathematics.

Ok official pi days are: 1/3 2/6 3/9 4/13 (controversial) 5/16 6/19 7/22 (a very good pi day) 8/25 9/28 10/31 (new Halloween treat unlocked)

Pi day(s) should be celebrated on days where the ratio between the month and date are close to pi. So mark your calendars! Next pi day is 7/22

Not just any math zines… RISO printed math zines!

Making bracelets at Kickoff to Summer at the MN State Fairgrounds this evening! Come play with us! Here through Sunday. All the usual @mathhappens.bsky.social faves are here with us too!