this post was submitted on 16 Mar 2026
435 points (99.1% liked)

Today I Learned

28757 readers
1029 users here now

What did you learn today? Share it with us!

We learn something new every day. This is a community dedicated to informing each other and helping to spread knowledge.

The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:

Rules (interactive)


Rule 1- All posts must begin with TIL. Linking to a source of info is optional, but highly recommended as it helps to spark discussion.

** Posts must be about an actual fact that you have learned, but it doesn't matter if you learned it today. See Rule 6 for all exceptions.**



Rule 2- Your post subject cannot be illegal or NSFW material.

Your post subject cannot be illegal or NSFW material. You will be warned first, banned second.



Rule 3- Do not seek mental, medical and professional help here.

Do not seek mental, medical and professional help here. Breaking this rule will not get you or your post removed, but it will put you at risk, and possibly in danger.



Rule 4- No self promotion or upvote-farming of any kind.

That's it.



Rule 5- No baiting or sealioning or promoting an agenda.

Posts and comments which, instead of being of an innocuous nature, are specifically intended (based on reports and in the opinion of our crack moderation team) to bait users into ideological wars on charged political topics will be removed and the authors warned - or banned - depending on severity.



Rule 6- Regarding non-TIL posts.

Provided it is about the community itself, you may post non-TIL posts using the [META] tag on your post title.



Rule 7- You can't harass or disturb other members.

If you vocally harass or discriminate against any individual member, you will be removed.

Likewise, if you are a member, sympathiser or a resemblant of a movement that is known to largely hate, mock, discriminate against, and/or want to take lives of a group of people, and you were provably vocal about your hate, then you will be banned on sight.

For further explanation, clarification and feedback about this rule, you may follow this link.



Rule 8- All comments should try to stay relevant to their parent content.



Rule 9- Reposts from other platforms are not allowed.

Let everyone have their own content.



Rule 10- Majority of bots aren't allowed to participate here.

Unless included in our Whitelist for Bots, your bot will not be allowed to participate in this community. To have your bot whitelisted, please contact the moderators for a short review.



Partnered Communities

You can view our partnered communities list by following this link. To partner with our community and be included, you are free to message the moderators or comment on a pinned post.

Community Moderation

For inquiry on becoming a moderator of this community, you may comment on the pinned post of the time, or simply shoot a message to the current moderators.

founded 2 years ago
MODERATORS
top 50 comments
sorted by: hot top controversial new old
[–] No1@aussie.zone 9 points 7 hours ago* (last edited 7 hours ago)

Everything went well until they tried adding the dome to the Indiana Statehouse.

[–] NotASharkInAManSuit@lemmy.world 16 points 15 hours ago

Yeah, fuck maths!

[–] Ghostalmedia@lemmy.world 232 points 1 day ago (5 children)

They didn’t even round to the closet decimal. 3.1 is closer to pi than 3.2.

[–] MagicShel@lemmy.zip 118 points 1 day ago (1 children)

They had no idea they couldn't legislate math and force it to obey. You are crediting them with an overabundance of brain function in relation to what evidence suggests.

[–] UnderpantsWeevil@lemmy.world 43 points 1 day ago

they couldn’t legislate math and force it to obey

They can legislate education and enforce the curriculum through hiring of staff and purchasing of educational material. That said, this isn't what was at issue with the legislation.

You are crediting them with an overabundance of brain function

In my personal experience as a kid who took Calculus and Physics, we were never really expected to use more precision than 3.14 for grading purposes.

Unless you're getting into a professional degree of engineering or foundational mathematics, there's no notable utility in establishing Pi past the first decimal or three.

If you get into the actual meat of the article

In 1894 physician and mathematical dabbler Edward J. Goodwin believed he had found one. He felt so proud of his discovery that, in 1897, he drew up a bill for his home state of Indiana to enshrine what he thought was a mathematical proof into law. In exchange, he would allow the state to use his proof without paying royalties. At least three major red flags should have prompted lawmakers to regard Goodwin with skepticism. Math research has no norm about charging royalties or precedent for legally ratifying theorems, and the supposed proof was nonsense. Among other errors, it claimed that pi, the ratio of a circle’s circumference to its diameter, is 3.2 rather than the well-established 3.14159.... Yet, in a bizarre legislative oversight, the Indiana House of Representatives passed the bill in a unanimous vote.

This is incredibly dated news and largely a commentary on how easily a state legislature will rubber stamp a bill without reading the fine print.

[–] LSNLDN@slrpnk.net 13 points 20 hours ago (1 children)

All the numbers after the 3.1 I bet they thought it made it bigger

[–] prex@aussie.zone 4 points 17 hours ago* (last edited 17 hours ago) (1 children)

Well, there are a lot of them...
...uh oh

[–] glitch1985@lemmy.world 2 points 13 hours ago

Was a lot of them

[–] Nurse_Robot@lemmy.world 25 points 1 day ago

My first thought as well

[–] porcoesphino@mander.xyz 9 points 1 day ago

Because it was a mistake in a proof, not legislation aimed to change pi

load more comments (1 replies)
[–] unemployedclaquer@sopuli.xyz 17 points 17 hours ago

I need a shower after that headline

[–] sylver_dragon@lemmy.world 8 points 15 hours ago
[–] sundray@lemmus.org 47 points 21 hours ago (1 children)

Reject π! Embrace τ! The superior constant!

[–] crystalmerchant@lemmy.world 8 points 20 hours ago (3 children)

How the hell you make that

[–] WindyRebel@lemmy.world 68 points 20 hours ago (1 children)

Probably with their pie cutter.

[–] SCmSTR@lemmy.blahaj.zone 8 points 16 hours ago

Upsetting...

[–] brian@lemmy.ca 11 points 20 hours ago

if you make a π but then don't do the | then you get τ

[–] sundray@lemmus.org 6 points 18 hours ago (2 children)
[–] ScoffingLizard@lemmy.dbzer0.com 2 points 8 hours ago

If you use heliboard it's in alternative symbols.

[–] NotASharkInAManSuit@lemmy.world 7 points 14 hours ago

I was expecting mechs and fish people.

My disappointment is immeasurable and my day is ruined.

[–] MolochHorridus@piefed.social 79 points 1 day ago (4 children)

This kind of anti-scientific bullshit could only happen in the U.S.A.

[–] Ghostalmedia@lemmy.world 52 points 1 day ago (3 children)

It was the late 1800’s. Dumb shit wasn’t in short supply in the world.

Problem is, I could also see Trump’s WWE education secretary pushing for this in 2026.

[–] Zos_Kia@jlai.lu 2 points 7 hours ago

Honestly in terms of late 1800s engineering, pi = 3.2 is accurate within 2% it's not that scandalous

[–] Marthirial@lemmy.world 16 points 22 hours ago

The fact that it is 100% plausible today is the worrying part.

[–] orlyowl@piefed.ca 5 points 23 hours ago

Yes I was fully expecting the details to be "It was a Republican-sponsored bill in 1992" or similar. It's just too damn believable.

load more comments (3 replies)
[–] mech@feddit.org 41 points 23 hours ago* (last edited 23 hours ago) (1 children)

Godless heathens!
Pi is exactly 3, God said so in the Bible (1 Kings 7:23)

[–] victorz@lemmy.world 18 points 22 hours ago (1 children)

Pretty close though eh, one or two cubits off, ~96% accurate. Just like the rest of the bible, right?

[–] deacon@lemmy.world 6 points 21 hours ago (2 children)

Assuming we are talking about historical accuracy and not theological accuracy (whatever that is), I’m not sure how low the number is, but it’s certainly less than half of 96%, especially the Old Testament

[–] victorz@lemmy.world 1 points 12 hours ago

we are talking about historical accuracy and not theological accuracy

I was mostly just making a joke 😅

[–] chaogomu@lemmy.world 5 points 20 hours ago (1 children)

I can sort of answer this for you. The process of writing the old testament started in 537BCE and the end of the Babylonnian exile.

This is when Monotheism entered the story as well.

Anything before Cyrus the Great conquered Babylon is suspicious, and anything before Solomon is fully made up.

[–] deacon@lemmy.world 5 points 20 hours ago (1 children)

Agreed re: Solomon. My sense is that a lot of it was compiled during Josiah’s reign but my knowledge of the topic is sparse. Are you familiar with the theory that the David story is post hoc propaganda after David Coup’d Saul, and the David & Bathsheba story was fabricated as propaganda to legitimize Solomon after he coup’d David?

I’m certainly over simplifying.

[–] chaogomu@lemmy.world 3 points 18 hours ago (1 children)

I mostly came across it all from studying Cyrus the Great, the King of Kings, and then focused on the exile, or captivity or however you want to call it.

The Neo-Babylonians started conquering Judah in about 600BCE, they burned Jerusalem, and destroyed Solomon's Temple in 587.

The Babylonians were pretty thorough in destroying any religious icons or texts of their new slaves, which included priests and nobles who knew how to read, which was useful to the Babylonians.

This is how Babylonian creation myths ended up making cameos in the new Hebrew bible written from scraps and invention after Cyrus freed the slaves of Babylon as a kind of last fuck you to the city as he declared himself King of Babylon. (or a way to make said slaves love him)

[–] deacon@lemmy.world 2 points 17 hours ago (1 children)

I’m really interested in studying Cyrus the Great, I just got distracted by biblical history as a fixation.

Random Cyrus-related fact: David Koresh of the Waco Branch Davidians changed his last name from Howell to Koresh which is the biblical name for Cyrus.

[–] chaogomu@lemmy.world 2 points 16 hours ago (4 children)

A good intro to Cyrus the Great might be Dan Carlin's Hardcore History. The King of Kings series. It's only, what, 16 hours or so long.

The guy can talk, but he also lists his sources, which are also good jumping off points.

load more comments (4 replies)
[–] Sanguine@lemmy.dbzer0.com 30 points 22 hours ago

This is perfectly on brand

[–] electric_nan@lemmy.ml 12 points 20 hours ago
[–] porcoesphino@mander.xyz 25 points 1 day ago* (last edited 1 day ago)

Its an interesting story but a bit misrepresented. Here's how the post title is misrepresenting the story but it misses lots of the details:

Here’s the problem that has consumed ancient Greek mathematicians and countless others: given a circle, construct a square with the same area as it using only a compass and straightedge.

In 1894 physician and mathematical dabbler Edward J. Goodwin believed he had found [a proof]

he would allow the state to use his proof without paying royalties

The proof made a mistake that set the value of pi to 3.2

The article points out it was an odd piece of legislation because royalties aren't charged for proofs but doesn't really make clear what this proof was going to be used for. Just:

they seemed confused about the bill’s contents and played hot potato with it, tossing it to the Committee on Canals, which flung it over to the Committee on Education. They held three formal readings of the bill before voting

[–] expatriado@lemmy.world 28 points 1 day ago

if they repeal the laws of gravity i would consider visiting

[–] Treczoks@lemmy.world 8 points 22 hours ago

On the same scientific level as the age verification inside the OS...

[–] lena@gregtech.eu 11 points 1 day ago (2 children)

This kind of people are making laws about technology, something they don't understand at all, just like π.

load more comments (2 replies)
[–] _haha_oh_wow_@sh.itjust.works 7 points 23 hours ago (1 children)

This is why you don't gut the educational system.

[–] wizardbeard@lemmy.dbzer0.com 6 points 23 hours ago (1 children)

Because people miss that this happened over 100 years ago, right?

load more comments (1 replies)
[–] BallShapedMan@lemmy.world 7 points 1 day ago

Math is math...

load more comments
view more: next ›