Christopher Danielson
LightNews LightNews
banner
triangleman.bsky.social
Christopher Danielson
@triangleman.bsky.social
1.6K followers 330 following 2.6K posts
Kids, math, fruit, words

talkingmathwithkids.com
Posts Replies Media Videos
triangleman.bsky.social
Haha those cool things did not involve the November weather!

Fresh pressed cider game is strong though!
A half gallon of cider from the Franklin cider mill (ingredients: fresh Michigan apples) rests on a wooden bench on front of a stream full of ducks
November 12, 2025 at 11:59 AM
triangleman.bsky.social
Hey @phonisha.bsky.social ! What flavor should I pick up on your behalf tonight?
A display of Faygo glass bottle six-packs. Grape, Redpop, Orange, and Creme Soda are visible
November 12, 2025 at 2:18 AM
triangleman.bsky.social
Greetings from Sun Country y’all!
A grey morning sky above a suburban concrete and asphalt landscape. There is a small leafless tree in the foreground
November 11, 2025 at 1:28 PM
triangleman.bsky.social
Oh man the irony of a Sun Country flight between Minneapolis and Detroit in November.
A screen announcing Sun Country Flight 1981 to Detroit, departing at 7:12 am
November 10, 2025 at 12:57 PM
triangleman.bsky.social
Argh! The headline is not what the data says. What are we even doing here?!?
Slide with this headline: “Supplemental Secondary Math Spending Projected to Fall; Slight Decrease Foreseen in ELA” Survey Question: When it comes to the following types of middle and high school curricula, how do you anticipate your spending for NEXT YEAR'S budget (2026-27) will compare to the spending in the current (2025-26) budget? Graphs show that somewhat fewer respondents said they expect spending to increase (versus stay the same or decrease) compared to a year ago.
November 5, 2025 at 4:51 PM
triangleman.bsky.social
Shout out to whoever writes copy for Little Owl Coffee on Denver.
A paper sign hangs in a quirky coffee shop next to the menu. “ DRINK DU SPOOKY JOUR DIRT AND WORMS Dad tip of the day: for your next grown up potluck party, ignore the requests of the host to bring gross things like salad or whatever, and just bring a giant bowl of pudding, oreos, and gummy worms. 100% chance of success. Anyway this is that but a latte. House-made (duh) oreo milk and chocolate with gummy worm garnish. Boo!”
November 4, 2025 at 3:52 PM
triangleman.bsky.social
I would very much like to read a psycho-linguistic analysis of the use of "my" and "your" in digital interfaces, and how those decisions get made.
screenshot of an email subject line that reads in part "Your myCigna account"
November 3, 2025 at 8:09 PM
triangleman.bsky.social
deep group inquiry here
Triangleman and four children all looking and pointing at the page of a picture book. One child slid out of her seat at the far end of the table and sprawled across it to get within reach of the book.
October 31, 2025 at 9:38 PM
triangleman.bsky.social
HEXAGONS T-SHIRTS!

talkingmathwithyourkids.myspreadshop.com/all

Sized for the young ones in your life.

Colors and sleeve lengths vary a bit from the prototype this young mathematician is wearing, but the joy is the same!
A toddler grins outside on a sunny day, wearing a long-sleeved black t-shirt with a variety of googly-eyed, mostly irregular hexagons and the word HEXAGONS at the top.
October 31, 2025 at 8:43 PM
triangleman.bsky.social
Is it apples?
Email header screenshot. From Better Homes and Gardens. Subject line: The No. 1 Ingredient for the Best Apple Pie. Preview text says “It may be hiding in your fridge.”
October 21, 2025 at 1:18 AM
triangleman.bsky.social
Hey Twin Cities!

Anybody need an aloe plant? I have two like this that were offshoots from a much MUCH larger one a year ago. And now that big one is putting up more shoots. The little ones are free to a good home. Let me know and we’ll work out the details.
A small aloe plant in a square brown plastic pot on a ceramic circular coaster rests on a table where it casts shadows in two directions. A brick wall is in the background.
October 2, 2025 at 10:34 PM
triangleman.bsky.social
Oh haha yeah. Example from current work...
Chapter 2: The Math of Which One Doesn’t Belong? INTRODUCTORY TEXT Sets In math, a “set” is a collection of things.
September 17, 2025 at 10:29 PM
triangleman.bsky.social
An example from How Did You Count? (published by Stenhouse this spring, and available at all the places you order books from)
Chapter 1: What Counts as Counting? MAYBE A TMWYK EXAMPLE HERE Counting is how you know how many. OK. That’s not quite true. If you know at a glance how many dots...
September 17, 2025 at 10:27 PM
triangleman.bsky.social
An apple the size of a melon or a melon the size of an apple?
A small melon sits next to a large apple on a wooden table top. They are just about the same size.
September 15, 2025 at 3:58 PM
triangleman.bsky.social
like...

there is no box; there are no checkmarks
"If there are only two jobs total, you may check this box" This is just to right of a selectable radio button.
September 12, 2025 at 3:38 PM
triangleman.bsky.social
wait...

...if it's NEGATIVE four days overdue, doesn't that mean...
screenshot with a pencil and clipboard icon, and "Withholding Forms Wizard. Incomplete." In red type it reads, "-4 days overdue"
September 12, 2025 at 3:32 PM
triangleman.bsky.social
Here it is! The blue pentagon under the red cylinder.
A wooden shapes puzzle labeled “PENTAGONS” which has, near its center, the shape as described
September 2, 2025 at 11:06 PM
triangleman.bsky.social
Enjoying a quiet moment with Trianglespouse amid the chaos of the fair
Selfie with my wife. She is wearing a black and white shirt covered in tiny equilateral triangles. A piece of hexagon art hangs in the background
August 30, 2025 at 8:28 PM
triangleman.bsky.social
The Shape Puzzle Theorem: All isosceles triangles are truncated degenerate hyperbolas.
A green obtuse isosceles triangle (in the style of a chunky toddler toy) rests atop a “Conic Sections” puzzle which has green painted spaces for hyperbola pieces. It looks as though the triangle could adjust about fit into the hyperbola hole.
August 28, 2025 at 12:27 AM
triangleman.bsky.social
Update: I have been successful!

Several more ripening out back. It’s melonpalooza over here for the next week!
A small melon; bigger that a softball but smaller than a soccer ball in a hand on a sunny morning in front of a flower garden The melon is cut in half; the two very juicy halves are cut side up on a wooden cutting board. The cross section reveals triangular seed compartments (which is surely not the right word)
August 27, 2025 at 1:04 PM
triangleman.bsky.social
Hey @kassiaowedekind.bsky.social and @tracyzager.bsky.social !!

How many? How did you count them?
Overhead shot of a grocery store melon display. A 3 by 3 grid of small smooth melons plus two more on top are at upper right. Surrounding those are three loose groups of three musk melons
August 24, 2025 at 8:54 PM
triangleman.bsky.social
Meanwhile, back in Minnesota…

(photo credit: J Ostlund, who joined the leadership team in order to kick things off this morning)
A happy pleasant scene at math on a stick. There are people at tables and standing chatting. There are colorful umbrellas and flowers and wood chips. It is a beautiful late summer day.
August 21, 2025 at 9:07 PM
triangleman.bsky.social
In a stunning twist, we come across a convergence of #vehiclechat and #sandwichchat while seeking lunch
Selfie with wiener mobile on the streets of Chicago
August 21, 2025 at 7:20 PM
triangleman.bsky.social
#pairedtexts
Young woman yelling into young man’s ear meme Trump yelling into Putins ear on the tarmac in Alaska
August 16, 2025 at 1:27 AM
triangleman.bsky.social
On my own this evening, this was about a half hour of work. We're gonna crush this thing!
Nine large hexagons, made of colorful pattern blocks with various and interesting symmetries, tiled together to make a larger mosaic, roughly 12 inches square.
August 11, 2025 at 11:26 PM