Paul Callahan (he/him)
@paulcallahanmv.bsky.social
Computer scientist with a bunch of weird hobbies. I have mostly been linking news and making political comments. I plan to post more 3D print models and other math crafts when I can.
"When the world falls apart, some things stay in place."
"When the world falls apart, some things stay in place."
Pinned
Paul Callahan | Printables.com
I've had an interest in puzzles and tilings for many years and use 3D printing to try out ideas. – 3D models
www.printables.com
Sadly, I mostly post news and politics these days. I post a little AI art now and then as well.
But see my printables link for what really gets me going: tesselations and puzzles.
But see my printables link for what really gets me going: tesselations and puzzles.
PSA: If you don't regard Putin as a bad guy, then you are one yourself.
November 26, 2025 at 9:38 PM
PSA: If you don't regard Putin as a bad guy, then you are one yourself.
My only consistent Thanksgiving tradition. It starts with a scraggly thyme plant I have somehow kept alive for over 20 years. Then a tedious process of separating enough for stuffing... with Boy George singing in my head "But you and me we know they've got nothing but thyme."
A day early this year.
A day early this year.
November 26, 2025 at 5:57 PM
My only consistent Thanksgiving tradition. It starts with a scraggly thyme plant I have somehow kept alive for over 20 years. Then a tedious process of separating enough for stuffing... with Boy George singing in my head "But you and me we know they've got nothing but thyme."
A day early this year.
A day early this year.
Some say the glass of American democracy is 90% empty. I say it is 10% full.
November 26, 2025 at 4:31 PM
Some say the glass of American democracy is 90% empty. I say it is 10% full.
What do you call someone who shows up in a mask and combat gear to confront the most vulnerable, defenseless members of society?
I can think of a lot of names, but let's start with coward. Bully works too. Thug is good. That's without getting analytical or considering the politics. Shall I go on?
I can think of a lot of names, but let's start with coward. Bully works too. Thug is good. That's without getting analytical or considering the politics. Shall I go on?
November 26, 2025 at 6:44 AM
What do you call someone who shows up in a mask and combat gear to confront the most vulnerable, defenseless members of society?
I can think of a lot of names, but let's start with coward. Bully works too. Thug is good. That's without getting analytical or considering the politics. Shall I go on?
I can think of a lot of names, but let's start with coward. Bully works too. Thug is good. That's without getting analytical or considering the politics. Shall I go on?
"Indeed, such abductions have become so common that a major recent Bitcoin conference included a daylong “counter-kidnapping” workshop, in which participants learned, among other things, how to gnaw their way through zipties."
The Trump Trade is Unraveling
Tells from the crypto crash
paulkrugman.substack.com
November 25, 2025 at 2:28 AM
"Indeed, such abductions have become so common that a major recent Bitcoin conference included a daylong “counter-kidnapping” workshop, in which participants learned, among other things, how to gnaw their way through zipties."
I didn't even know Page was in the running. He's been so quiet for years.
Larry Page Passes Larry Ellison Becoming World’s Second-Richest
The Google parent’s stock has accelerated over the last week and is now valued more than Microsoft.
www.forbes.com
November 24, 2025 at 7:27 PM
I didn't even know Page was in the running. He's been so quiet for years.
Another commute from Mountain View Caltrain and I still haven't spotted the emu.🥁
November 24, 2025 at 4:36 PM
Another commute from Mountain View Caltrain and I still haven't spotted the emu.🥁
I am not religious but this is a great article on the rightwing perversion of Christianity from a very personal perspective.
They’re doing to America what they did to Christianity | Bill McKibben
Trump’s wrecking-ball approach to America has a precedent: the evangelical perversion of Jesus’s message of radical love to one of hate and aggression
www.theguardian.com
November 24, 2025 at 5:33 AM
I am not religious but this is a great article on the rightwing perversion of Christianity from a very personal perspective.
Without reading first, I'm going to bet it's because when you fly into Toronto, you don't run the risk of being handcuffed at customs and sent to prison in Louisiana. Am I on the right track here?
#ice #massdeportation
#ice #massdeportation
ANALYSIS | Canadians are shunning U.S. travel — and reaping the rewards | CBC News
U.S. President Donald Trump’s divisive politics, tariffs and heightened border security have helped drive a decline in international tourism spending in the U.S. Meanwhile, polls and industry experts ...
www.cbc.ca
November 21, 2025 at 4:55 PM
Without reading first, I'm going to bet it's because when you fly into Toronto, you don't run the risk of being handcuffed at customs and sent to prison in Louisiana. Am I on the right track here?
#ice #massdeportation
#ice #massdeportation
"Much of China’s foreign policy, rather than exporting its ideology abroad, is aimed at shoring up the power of the Communist Party at home. What outside observers take to be aggressive moves are often aimed at solving internal problems." (Gift article)
Opinion | The Thucydides Trap Is Coming for America
www.nytimes.com
November 21, 2025 at 3:19 PM
"Much of China’s foreign policy, rather than exporting its ideology abroad, is aimed at shoring up the power of the Communist Party at home. What outside observers take to be aggressive moves are often aimed at solving internal problems." (Gift article)
Penrose Voronoi diagram ink stamps by Paul Callahan | Download free STL model | Printables.com
www.printables.com
November 21, 2025 at 3:13 PM
This is interesting research though it confused me. The synthetic part is the growth medium. It is used to grow human brain cells. That part is real.
Scientists engineer first fully synthetic brain tissue model
UCR scientists create a fully synthetic model for growing brain cells that could allow for animal-free drug testing.
news.ucr.edu
November 20, 2025 at 3:49 PM
This is interesting research though it confused me. The synthetic part is the growth medium. It is used to grow human brain cells. That part is real.
"We always knew that President “Piggy” despised women and admired tyrants, seeing nothing wrong with hacking up your critics with a bone saw. But even a few months ago I think he would have been self-controlled enough to be less obvious about it."
Reminder: Crypto Is a Trump Trade
The industry bought a president. Bad investment?
paulkrugman.substack.com
November 19, 2025 at 3:57 PM
"We always knew that President “Piggy” despised women and admired tyrants, seeing nothing wrong with hacking up your critics with a bone saw. But even a few months ago I think he would have been self-controlled enough to be less obvious about it."
November 19, 2025 at 4:14 AM
"While many political analysts on the center and center left today suggest the Democrats need to publicly take more moderate positions to appeal more to independents, the evidence suggests the weak party brand is actually coming from disaffection the left."
New poll: Democrats lead the 2026 House generic ballot, and their edge widens when voters are reminded Republicans control Congress
Plus: Voters see both parties as out of touch, but for different reasons; Trump hits new low on pocketbook issues; Large majorities oppose ending ACA subsidies and SNAP, support taxing high earners
www.gelliottmorris.com
November 18, 2025 at 5:06 PM
"While many political analysts on the center and center left today suggest the Democrats need to publicly take more moderate positions to appeal more to independents, the evidence suggests the weak party brand is actually coming from disaffection the left."
Some inspiring Bible verses that all our self-proclaimed "Christians" ought to be aware of. Sometimes I think many are not. For some reason I can't quite put my finger one.
November 18, 2025 at 4:51 PM
Some inspiring Bible verses that all our self-proclaimed "Christians" ought to be aware of. Sometimes I think many are not. For some reason I can't quite put my finger one.
It only harms us.
Stop ‘stigmatising’ Chinese students and researchers, ambassador to US says
‘People with vision’ should speak up against unfair attacks and ‘smears’, top envoy Xie Feng says.
www.scmp.com
November 17, 2025 at 5:01 PM
It only harms us.
Reposted by Paul Callahan (he/him)
Jeffrey Epstein’s emails reveal a disdain for morality among the elite | Moira Donegan
Jeffrey Epstein’s emails reveal a disdain for morality among the elite | Moira Donegan
Epstein paints Trump as someone he knew intimately. But the documents also reveal how many powerful men confided in him
www.theguardian.com
November 17, 2025 at 2:59 PM
Jeffrey Epstein’s emails reveal a disdain for morality among the elite | Moira Donegan
"The big money always responds to threats of tax hikes, or even mere verbal criticism, by threatening to go all Ayn Rand and move to Galt’s Gulch. In reality, they won’t even move to Florida."
The Plutocrats Who Cried “Commie”
About that “fleeing New York” claim
paulkrugman.substack.com
November 17, 2025 at 3:48 PM
"The big money always responds to threats of tax hikes, or even mere verbal criticism, by threatening to go all Ayn Rand and move to Galt’s Gulch. In reality, they won’t even move to Florida."
I have been playing around with QWEN for AI art. It started out a little finicky, but it gets the narrative best in these pictures. My idea is a "careful what you wish for" cautionary tale. In each image, a portal opens up to an eldritch but not actually hostile world. #ai-art #qwen #fantasyart
November 16, 2025 at 7:07 PM
I have been playing around with QWEN for AI art. It started out a little finicky, but it gets the narrative best in these pictures. My idea is a "careful what you wish for" cautionary tale. In each image, a portal opens up to an eldritch but not actually hostile world. #ai-art #qwen #fantasyart
I have no trouble seeing myself as an animal. We're made out of the same kinds of cells, and our anatomy is like every other tetrapod, just in different proportions. Our power structures resemble chimp hierarchies at a larger scale. What's the puzzle?
The last frontier of empathy: why we still struggle to see ourselves as animals | Megan Mayhew Bergman
Champions of exceptionalism say humans hold a unique moral status. Yet there’s only one species recklessly destroying the planet it needs to survive
www.theguardian.com
November 16, 2025 at 4:33 PM
I have no trouble seeing myself as an animal. We're made out of the same kinds of cells, and our anatomy is like every other tetrapod, just in different proportions. Our power structures resemble chimp hierarchies at a larger scale. What's the puzzle?
More 3D-printing polymer clay fun. You can see that mine did not come out perfect, but I'm a rank amateur at polymer clay. If you want to make a stocking-stuffer puzzle, the clay is more personal and can be varied e.g. with marbling.
#3d-printing #polymerclay #pentominoes #puzzles
#3d-printing #polymerclay #pentominoes #puzzles
Polymer clay cutter for complete pentomino set (5mm squares) by Paul Callahan | Download free STL model | Printables.com
www.printables.com
November 16, 2025 at 12:32 AM
More 3D-printing polymer clay fun. You can see that mine did not come out perfect, but I'm a rank amateur at polymer clay. If you want to make a stocking-stuffer puzzle, the clay is more personal and can be varied e.g. with marbling.
#3d-printing #polymerclay #pentominoes #puzzles
#3d-printing #polymerclay #pentominoes #puzzles
“Why do people see little horns and leap to ‘devil’ instead of ‘juvenile gazelle?’”
‘Lucifer Bee’ With Devil-Like Horns Discovered In Australia
Australian researchers identified a new species of native bee with tiny horn-like projections on the female’s face, prompting comparisons to a Satanic figure. What do you think?
theonion.com
November 15, 2025 at 9:47 PM
“Why do people see little horns and leap to ‘devil’ instead of ‘juvenile gazelle?’”
"The Times can make an issue salient, and its choice not to make an issue salient is tremendous."
Talking With Margaret Sullivan
The state of the media in Trump Two Year One
paulkrugman.substack.com
November 15, 2025 at 4:42 PM
"The Times can make an issue salient, and its choice not to make an issue salient is tremendous."