Christopher Danielson
@triangleman.bsky.social
Kids, math, fruit, words
talkingmathwithkids.com
talkingmathwithkids.com
An important doctor in my father’s hospital care right now is named “Dr. John” and my father is not at all a music guy so this is completely lost on him.
www.youtube.com/watch?v=50yE...
www.youtube.com/watch?v=50yE...
Dr. John - Iko Iko (Live at Montreux 1995)
YouTube video by Montreux Jazz Festival
www.youtube.com
November 11, 2025 at 5:17 PM
An important doctor in my father’s hospital care right now is named “Dr. John” and my father is not at all a music guy so this is completely lost on him.
www.youtube.com/watch?v=50yE...
www.youtube.com/watch?v=50yE...
A triangle is nothing but a quadrilateral with exactly one straight angle so yes?
Are there more quadrilaterals than triangles?
November 11, 2025 at 4:21 PM
A triangle is nothing but a quadrilateral with exactly one straight angle so yes?
Outside the platonic realm there is no such thing as polygon so no?
Are there more quadrilaterals than triangles?
November 11, 2025 at 4:20 PM
Outside the platonic realm there is no such thing as polygon so no?
In topology quadrilaterals ARE triangles so no?
Are there more quadrilaterals than triangles?
November 11, 2025 at 4:20 PM
In topology quadrilaterals ARE triangles so no?
Well in children’s shape books there is only one triangle so yes?
Are there more quadrilaterals than triangles?
November 11, 2025 at 4:19 PM
Well in children’s shape books there is only one triangle so yes?
Guy from Alaska in this Hampton Inn breakfast lobby making sure everyone knows (1) that he is from Alaska, and therefore (2) this isn’t cold.
November 11, 2025 at 2:18 PM
Guy from Alaska in this Hampton Inn breakfast lobby making sure everyone knows (1) that he is from Alaska, and therefore (2) this isn’t cold.
Reposted by Christopher Danielson
BREAKING: The Supreme Court denied an attempt to challenge Obergefell v. Hodges, the case affirming marriage equality nationwide.
Our freedom to marry remains the law of the land.
Our freedom to marry remains the law of the land.
November 10, 2025 at 2:46 PM
BREAKING: The Supreme Court denied an attempt to challenge Obergefell v. Hodges, the case affirming marriage equality nationwide.
Our freedom to marry remains the law of the land.
Our freedom to marry remains the law of the land.
I just overheard the sentence, “That one’s full; there’s nothing in it” and it kind of actually made sense in the moment.
November 10, 2025 at 3:09 PM
I just overheard the sentence, “That one’s full; there’s nothing in it” and it kind of actually made sense in the moment.
Oh man the irony of a Sun Country flight between Minneapolis and Detroit in November.
November 10, 2025 at 12:57 PM
Oh man the irony of a Sun Country flight between Minneapolis and Detroit in November.
Reposted by Christopher Danielson
Wake up mtbos, new playdate just dropped!
Seattle-area folks, come play games with us on January 31st!
Learn more/register: bit.ly/UpcomingEven...
Learn more/register: bit.ly/UpcomingEven...
November 9, 2025 at 10:22 PM
Wake up mtbos, new playdate just dropped!
Reposted by Christopher Danielson
NOOO. DO NOT TOUCH IT. WHY WOULD YOU *EVER* TOUCH IT?
YOU *KNOW* WHAT IT IS. WHY WOULD YOU TOUCH IT?
WHY?
WHY WOULD YOU TOUCH THE HUGE SAC OF 111,000 SPIDERS?
YOU *KNOW* WHAT IT IS. WHY WOULD YOU TOUCH IT?
WHY?
WHY WOULD YOU TOUCH THE HUGE SAC OF 111,000 SPIDERS?
World's biggest spiderweb discovered inside 'Sulfur Cave' with 111,000 arachnids living in pitch black.
www.livescience.com/animals/spid...
www.livescience.com/animals/spid...
November 8, 2025 at 8:28 PM
NOOO. DO NOT TOUCH IT. WHY WOULD YOU *EVER* TOUCH IT?
YOU *KNOW* WHAT IT IS. WHY WOULD YOU TOUCH IT?
WHY?
WHY WOULD YOU TOUCH THE HUGE SAC OF 111,000 SPIDERS?
YOU *KNOW* WHAT IT IS. WHY WOULD YOU TOUCH IT?
WHY?
WHY WOULD YOU TOUCH THE HUGE SAC OF 111,000 SPIDERS?
Also a trillion is a million millions.
I don't think people realize how much a trillion dollars is.
Let's say you get paid a million dollars per day. That's a lot, right?
If you spend none of it and pay no taxes, you'll have a trillion dollars in approximately two thousand seven hundred (2700) YEARS.
No one should have that much.
Let's say you get paid a million dollars per day. That's a lot, right?
If you spend none of it and pay no taxes, you'll have a trillion dollars in approximately two thousand seven hundred (2700) YEARS.
No one should have that much.
November 7, 2025 at 2:28 AM
Also a trillion is a million millions.
New project alert!
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong, 2nd Edition
Hi! I'm Christopher, and I'm working on a second edition of the Teacher Guide for my Stenhouse/Routledge book Which One Doesn't Belong? This book celebrates its tenth anniversary in 2026. I have learn...
docs.google.com
November 6, 2025 at 5:23 PM
Reposted by Christopher Danielson
Are you ready to serve? More information is available here docs.google.com/document/d/1...
November 6, 2025 at 5:14 PM
Are you ready to serve? More information is available here docs.google.com/document/d/1...
Reposted by Christopher Danielson
#mtbos gang, assemble!
New project alert!
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong, 2nd Edition
Hi! I'm Christopher, and I'm working on a second edition of the Teacher Guide for my Stenhouse/Routledge book Which One Doesn't Belong? This book celebrates its tenth anniversary in 2026. I have learn...
docs.google.com
November 5, 2025 at 5:49 PM
#mtbos gang, assemble!
Argh! The headline is not what the data says. What are we even doing here?!?
November 5, 2025 at 4:51 PM
Argh! The headline is not what the data says. What are we even doing here?!?
Reposted by Christopher Danielson
It's going to be a great event! Join us! www.mctm.org/event-6284136
November 5, 2025 at 4:18 PM
It's going to be a great event! Join us! www.mctm.org/event-6284136
New project alert!
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong, 2nd Edition
Hi! I'm Christopher, and I'm working on a second edition of the Teacher Guide for my Stenhouse/Routledge book Which One Doesn't Belong? This book celebrates its tenth anniversary in 2026. I have learn...
docs.google.com
November 5, 2025 at 2:51 PM
New project alert!
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Which One Doesn't Belong? Second Edition.
I am deep in the middle of writing and would love input from folks who have used the routine in their classrooms.
Short Google form here—one page, eight questions, most of them optional: docs.google.com/forms/d/e/1F...
Update: Initial instinct of the CEO was to confirm that the numbers were true and tell me about how many phone calls they make every year with districts to keep their fingers on the pulse
I’ll let you know how receptive they are to the feedback
November 4, 2025 at 5:46 PM
Update: Initial instinct of the CEO was to confirm that the numbers were true and tell me about how many phone calls they make every year with districts to keep their fingers on the pulse
At an education market thing today (long story and it’s going just about how you would imagine it would for Triangleman)
November 4, 2025 at 5:04 PM
At an education market thing today (long story and it’s going just about how you would imagine it would for Triangleman)
Shout out to whoever writes copy for Little Owl Coffee on Denver.
November 4, 2025 at 3:52 PM
Shout out to whoever writes copy for Little Owl Coffee on Denver.
Wait. You’re telling me Dick Cheney was alive as recently as yesterday? I’m not buying it.
November 4, 2025 at 1:32 PM
Wait. You’re telling me Dick Cheney was alive as recently as yesterday? I’m not buying it.
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.
November 3, 2025 at 8:09 PM
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.
How say you, Internet friends? Is a Fruit Roll-Up flat? Even when it’s rolled up?
If there are children in your life, I would be especially interested in hearing their thoughts!
If there are children in your life, I would be especially interested in hearing their thoughts!
November 3, 2025 at 3:56 PM
How say you, Internet friends? Is a Fruit Roll-Up flat? Even when it’s rolled up?
If there are children in your life, I would be especially interested in hearing their thoughts!
If there are children in your life, I would be especially interested in hearing their thoughts!