Christopher Hanusa
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mathzorro.bsky.social
Christopher Hanusa
@mathzorro.bsky.social
1K followers 630 following 570 posts
Mathematician - Math Educator - Mathematical Artist - and loving it! Visit my @hanusadesign.com profile for #mathjewelry | #mtbos | #mathart | #plotter | #transit
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mathzorro.bsky.social
Christopher Hanusa @mathzorro.bsky.social · Nov 17
This talk was given on September 12 in the New York Combinatorics Seminar. Here's a link to the recording. youtu.be/BX6VkFHwn-g?...
Reposted by Christopher Hanusa
yrfatfriend.bsky.social
Even if Bovino gets fired, ICE has to go.
Even if Noem is out, ICE has to go.
Even when Trump leaves office, ICE has to go.

As protests grow and ICE's popularity drops, we may see concessions and leadership changes, like Bovino's departure. ICE still has to go.
www.cnn.com/us/live-news...
Live updates: Top Border Patrol official Bovino expected to leave Minneapolis as Trump sends Homan to the state | CNN
Tom Homan is headed to Minnesota after the fatal shooting of ICU nurse Alex Pretti in an encounter Saturday with federal agents deepened outrage over the Trump administration’s surge, part of its nati...
www.cnn.com
January 27, 2026 at 1:15 AM
Reposted by Christopher Hanusa
alextomlinson.com
Snowy Ptarmigans!
Flat illustration of a Willow Ptarmigan perched in wintry trees with 3 camouflaged in the snowy background. (From 2025)
January 26, 2026 at 2:45 PM
mathzorro.bsky.social
It was lovely to join the #illustratingmath community for two weeks, in Paris, no less. We added some fun to these important conversations about where and how this field fits in with and complements its adjacent fields.
msmathcomp.bsky.social Dr. Martin Skrodzki @msmathcomp.bsky.social · 2d
Friday was the final day of our "Rigorous Illustrations" conference at the Institut Henri Poincaré. First, we heard results from the working groups, some in the form of theater performances, some with hyperbolic mind maps; all concerning how to move #illustratingMath forward. (1/4)
A person stands at the front of a lecture hall speaking into a microphone. They are joined by four other people standing in front of a large chalkboard. A projector screen above displays a slide with a definition for "Illustration (approx.)." A close-up view of a white tabletop covered in various geometric paper models and templates. In the background, two people sit at the table, engaged in a conversation while working with the materials. Tim Reinhardt, wearing a scarf draped over their head, speaks into a microphone in a lecture hall. Behind them, a projector screen shows six circular diagrams containing various densities of purple dots, labeled $S_1$ through $S_{100}$. Six people stand and kneel in front of a chalkboard, smiling and holding up a large, complex white paper sculpture made of interconnected hexagonal shapes. The sculpture has various words written on its facets.
January 25, 2026 at 4:59 PM
Reposted by Christopher Hanusa
nyc.streetsblog.org
Snow is nature's urban planner: It can show us what parts of the roadway drivers don't use — and what can be reclaimed for pedestrians.

Post your photos and videos of all the #sneckdowns you see and tag us and @mayor.nyc.gov so today's winter wonderland can inspire better streets year-round!
January 25, 2026 at 2:23 PM
Reposted by Christopher Hanusa
billkristolbulwark.bsky.social
Yes, the GOP controls Congress. That's why it's key to show Congress COULD stop the madness. And it's not just the DHS bill. Congress could repeal the prior multi-year $75b for DHS; set up a special investigative committee (cf. Watergate); amend the Insurrection Act; etc.
January 25, 2026 at 1:08 PM
Reposted by Christopher Hanusa
msmathcomp.bsky.social
Before going into the group discussions, there is the second-to-last #art critique session of the conference. Today, we get to look at and discuss some art by @stevejtrettel.bsky.social, Elliot Kienzle, Jayadev Athreya, and Sam Fairchild. All beautiful examples of #illustratingMath. (3/3)
A photograph of Steve Trettel giving a presentation in a lecture hall. He is standing to the right of a large blackboard, wearing a black sweater and a cap, and holding a microphone. The projection screen behind him shows a high-quality 3D digital rendering of various colorful geometric shapes, including spheres, polyhedra, and a complex glass-like Klein bottle structure. On the blackboard, some mathematical equations like $A\vec{x} = \lambda\vec{x}$ are visible. A photograph of Elliot Kienzle presenting in a lecture hall. They are wearing a white coat with a bold red and yellow floral pattern and holding a microphone. The projection screen displays a stylized, hand-drawn scientific illustration of a purple, segmented anatomical or biological form with labels such as "Bun G," "Whittaker sheaf," and "cotangent fibers". A photograph of Jayadev Athreya speaking into a microphone in a lecture hall. He is wearing a dark hoodie and glasses, standing in profile. Above him, a wall-mounted monitor displays a bright, repeating geometric tessellation pattern in vibrant shades of green, yellow, purple, and blue. A photograph of Sam Fairchild giving a presentation. She is standing by a wooden desk, wearing a patterned dress and a grey cardigan, pointing toward a large projection screen. The screen shows a grid of six circular and square panels containing intricate, high-contrast mathematical patterns and blue-tinted visualizations. The blackboard behind her contains several hand-drawn diagrams and a numbered list of "Observations" and "Explanations".
January 22, 2026 at 9:15 PM
Reposted by Christopher Hanusa
kentremendous.bsky.social
Do it. I beg you. This madness ends a lot faster if billionaires lose money.
January 24, 2026 at 2:26 AM
Reposted by Christopher Hanusa
airlineflyer.net
American adding 3,000 seats on CLT-ORD tomorrow (Saturday) to help battle winter storm madness. The departure times are:

2:25p
2:46p
3:00p
3:40p
3:43p
4:21p
4:36p
5:00p
5:25p
5:48p
6:03p
6:10p
6:20p
7:00p
7:15p
7:30p
8:00p

Wow
January 24, 2026 at 4:42 AM
Reposted by Christopher Hanusa
joshuajfriedman.com
Do you appreciate @nws.noaa.gov's posts on Bluesky?

Did you know that this account is a pilot program that may or may not be continued and even expanded to NWS field offices?

NWS is soliciting comments here! www.surveymonkey.com/r/PrototypeN...
Press release:
www.weather.gov/media/notifi...
nws.noaa.gov National Weather Service @nws.noaa.gov · 5d
⚠️~132 million: Number of people under alerts for snow, sleet, & freezing rain.

A large, long-duration winter storm is expected to bring widespread heavy snow, sleet, & freezing rain from the Southern Rockies & Plains beginning Friday (Jan. 23), spreading eastward toward New England this weekend.
🧵
Map of the U.S. showing the watches, warnings, and advisories in effect across over 20 states.
January 22, 2026 at 7:53 PM
Reposted by Christopher Hanusa
msmathcomp.bsky.social
Some talks from our #illustratingMath graduate school at @cirm-math.bsky.social are now online and available to watch! 🤩 They're all wonderful so go check them out!

(Featuring @gavagesylvie.bsky.social and @stevejtrettel.bsky.social among others.)
biblicirm.bsky.social biblicirm.bsky.social @biblicirm.bsky.social · 6d
🆕🎬Illustration as a Mathematical Research Technique
Watch the talks of S. Benzoni, C. Goodman-Strauss, T. Einhardt, M. M. Katzenberger, D. Bachman , S. Trettel & S.Schleimer @cirm-math.bsky.social #math #conference #geometry
www.carmin.tv/fr/c/1718
urlr.me/2BW7UE
January 21, 2026 at 11:05 AM
Reposted by Christopher Hanusa
tienchihmath.bsky.social
As the semester picks up, if there are elements in your courses you would like to be free/accessible/interactive, then #PreTeXtGang may be your answer! Please join me, @chrissysafranski.bsky.social @clontz.org and @oscarlevin.com 12-1 Eastern each ThF for drop-in office hours! mathtech.org/events/
Events
Showcasing open-source technologies that innovate mathematics education and communication.
mathtech.org
January 21, 2026 at 5:48 PM
Reposted by Christopher Hanusa
samjshah.bsky.social
Day 1 (of 7) of the math art class I’m leading is in the books. We have 15 kids (9th and 10th graders). It’s exhausting! But I think it went well!

Kids built a George Hart Sculpture (actually we made two of them!) and we learned about V-E+F=2.

#MathArt #mtbos
January 21, 2026 at 11:16 PM
Reposted by Christopher Hanusa
molly.wiki
the knitters too. this is the top pattern on ravelry right now
A red knitted cap with a pointed crown with a braided tassel. It's titled "Melt the ICE Hat" and it's by YarnCultMN n the 1940’s, Norwegians made and wore red pointed hats with a tassel as a form of visual protest against Nazi occupation of their country. Within two years, the Nazis made these protest hats illegal and punishable by law to wear, make, or distribute. As purveyors of traditional craft, we felt it appropriate to revisit this design. The sample shown was knit in Blue Sky Fibers Skyland for the DK version. All proceeds from the sale of this pattern go to the LynLake community of businesses who will distribute the funds to those impacted by the actions of ICE.
January 19, 2026 at 4:40 AM
Reposted by Christopher Hanusa
helenalb.bsky.social
And everyone was worried about machines taking over.
slowbikeiain.bsky.social Iain Roberts @slowbikeiain.bsky.social · 7d
Yesterday it was cows using tools, today its penguins using satellite imagery.
Headline: "Scientists discover emperor penguin colony in Antarctica using satellite images"
January 21, 2026 at 7:42 AM
Reposted by Christopher Hanusa
bdlimm.bsky.social
Whether you live within Minnesota or without, Friday will be National Day of Solidarity with Minnesota.

✨ iceoutforgood.org ✨
Screenshot of the top part the "ICE Out for Good" website's homepage. Occupying the entire space of the screenshot is a photo of people lined up in a march that has filled up a city street; tall buildings surround the march in the background. Many people are holding signs; the words of some of these signs are visible/legible:"Education not deportation!" • "Freedom / Free Dylan" • "Good trouble / John Lewis" • "Justice / Eric Garner" • "Free Delmy / Free Them All." Overlaying the photo, front and center, in bold white font, is the title of the event: "JANUARY 23: National day of solidarity with Minnesota." In the upper-left corner is the "ICE Out for Good" logo, which has "ICE OUT" in black font with a white negative-space background that looks like a piece of tape ripped off and "FOR GOOD" underlined in red. In the upper-right corner is a "Take Action" button.
January 21, 2026 at 4:03 AM
Reposted by Christopher Hanusa
msmathcomp.bsky.social
In the afternoon, we continue with the second "Art Critique" session of the week. This time, @henryseg.bsky.social, Stepan Paul, and @mathzorro.bsky.social present their #illustratingMath works and let the audience critique them. Finally, we round things off with more group discussions. (2/2)
A person, Henry Segerman, with gray, curly hair and glasses, stands in front of a large chalkboard in a lecture hall. They are wearing a black zip-up jacket and black pants, gesturing with their hands while speaking into a microphone. Above them, a projector screen shows a close-up video of hands manipulating a 3D-printed sphere with colorful sections. On the chalkboard, handwritten notes include the words "Observations," "Artist Poses Questions," and "Opinions." A person, Stepan Paul, wearing a green checkered shirt and khaki pants, is presenting in a lecture hall. They are holding a microphone and gesturing toward a large projector screen. The screen displays a mathematical visualization from Desmos, featuring a large shaded circle with several points labeled $a_1$ through $a_9$ plotted around and inside it. A person, Christopher Hanusa, who is bald and wearing a dark shirt, stands at a wooden desk pointing toward a small wooden box with a glowing blue light inside. A group of four other people are gathered around the desk, leaning in to look closely at the device. The desk also holds a computer monitor, a keyboard, and audio-visual equipment. A person with gray hair stands at a long chalkboard, writing notes under the heading "Which samples?". Several other people are gathered around them, some sitting on the edge of a desk and others standing, participating in a brainstorming session. The chalkboard is filled with diagrams and handwritten questions, such as "How to encourage people to join?" and "Proof of Picture."
January 20, 2026 at 9:02 PM
Reposted by Christopher Hanusa
msmathcomp.bsky.social
2nd day of our #illustratingMath workshop on "Rigorous Illustrations" at the Institut Henri Poincaré. We heard from Shadab Tabatabaeian on cognitive effects of proofs, Elliot Kienzle on big vs. small #math, and Frédéric Brechenmacher on model history. Also, jewelry from @mathzorro.bsky.social. (1/2)
A person, Shadab Tabatabaeian, stands at the front of a lecture hall next to a large chalkboard. They are wearing a brown checkered blazer and a black turtleneck, gesturing with their hands while speaking. Behind them, a projector screen displays the title slide of their presentation: "The Body of Proof: How Inscriptions Shape Mathematical Discovery," identifying them as being from Georgetown University in Winter 2026. A person, Elliot Kienzle, is giving a presentation in a lecture hall. They are wearing a long green and yellow gradient cardigan over a white shirt and a green skirt. They are holding a slide clicker and gesturing toward the projector screen, which reads "Is Math BIG OR small?" with whimsical illustrations of the words and a character with a magnifying glass. A person, Christopher Hanusa, who is bald and wearing a black button-down shirt, leans over a white table covered in geometric jewelry and mathematical models. They are interacting with three other people who are looking closely at the items. The table is filled with small white cards displaying various 3D-printed shapes and intricate designs. A person, Frédéric Brechenmacher, stands at a podium in a lecture hall, wearing a black and white patterned jacket over a black shirt. They are gesturing toward a projector screen that displays a complex geometric diagram consisting of intersecting lines and circles. The slide title reads, "A non-textual form of geometric knowledge..."
January 20, 2026 at 9:02 PM
Reposted by Christopher Hanusa
sarahjeong.bsky.social
i feel like the viral bus thread resonates because at every step of the way you're like "ok surely this will be resolved shortly, any second now," which seems like what all the passengers are also thinking. then the fact that the situation doesn't resolve and the bus just keeps going is an Allegory
January 20, 2026 at 5:02 PM
Reposted by Christopher Hanusa
rude1.blacksky.team
Sometimes the most radical thing you can do is educate normal people on complex subjects in ways that are engaging and digestible.
January 20, 2026 at 2:08 PM
Reposted by Christopher Hanusa
elliesleightholm.bsky.social
Look 🥹🥹
January 19, 2026 at 8:21 PM
Reposted by Christopher Hanusa
elkement.art
This is how a customer of my store is using my Lissajous Figures pillows 💛 🧡

#SciArt #MathArt
Photo of an orange couch in front of a yellow wall, framed with orange curtains. Above the couch is an art print. The pillows show mathematcal art - Lissajous Figures in yellow, blue, white, red, black.
January 19, 2026 at 8:27 PM
mathzorro.bsky.social
Excited to be part of this creative community of mathematicians and artists. It plans to be a wonderful and inspiring week at the Institut Henri Poincaré! #illustratingmath
Four people standing at the front of a lecture hall. On the screen is an introduction slide for "Rigorous Illustration - Their Creation and Evaluation for Mathematical Research".
January 19, 2026 at 8:39 AM
Reposted by Christopher Hanusa
johannamath.bsky.social
#MathSky It is now only 2 weeks until the AWM/MfA Essay Contest deadline! If a student knows someone with a gender that's underrepresented in a mathematical career who's willing to do an interview with them in the coming week, they should enter! Categories: Grades 6-8, Grades 9-12, & Undergraduate.
johannamath.bsky.social Johanna Franklin @johannamath.bsky.social · 23d
#MathSky #JMM2026 It is 4 weeks until Feb. 1, better known as the AWM/MfA Essay Contest deadline! That's plenty of time for a student to interview a mathematician whose gender is underrepresented in math and write an essay about them. Contest rules below:
Student Essay Contest
Student Essay Contest Sponsored by AWM and Math for America To increase awareness of the ongoing contributions to the mathematical sciences by women and to promote gender inclusivity, the Associatio...
awm-math.org
January 18, 2026 at 5:45 PM
mathzorro.bsky.social
Ponder with me: What would we put in a mathematical fused-glass panel?

#MathSky #brainstorm #mathglass #glassmath
creativitysilver.bsky.social PJE @creativitysilver.bsky.social · 9d
A fused glass panel based on my father's fossil collection from holidays on the wonderful Dorset Jurassic Coast in the 1960s &70s. It missed #Artadventcalendar as it was a present!
#Stainedglass
#Fusedglass
#Kilncarving
#Glasspainting
A blue square fused glass panel with 3 kiln carved ammonites, a black glass paint seashell and seaweed, a copper shell and copper wavy seaweed inclusions. The panel has bubbles from the fusing process in the kiln and a hole where a big bubble popped which people have been kind enough to say could have been deliberate (but it wasn't).
January 18, 2026 at 8:34 PM
Reposted by Christopher Hanusa
gro-tsen.bsky.social
And in mathematics:

”A leader in the theory of pseudo-parabolic partial differential equations in quasi-convex domains will not stoop to being understood by specialists in quasi-parabolic partial differential equations in pseudo-convex domains.” (Giancarlo Rota, ‘Indiscrete Thoughts’)
January 18, 2026 at 2:03 PM