Unfortunately, all software engineers already know the answer to the useful theorems though (except perhaps notably for cryptography), e.g. all programmers obviously know that iehter P != NP or that this is unprovable or some other "for all practical purposes practice P != NP", even though they don't have proof.
And 99% of their time, software engineers are not dealing with mathematically formulatable problems anyways, which is sad.
The only useful "computer science" subset every programmer ever needs to know is:
- for arrays: dynamic array vs linked list
- for associative array: binary search tree vs hash table. See also Heap vs Binary Search Tree (BST). No need to understand the algorithmic details of the hash function, the NSA has already done that for you.
- don't use Bubble sort for sorting
- you can't parse HTML with regular expressions: stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454 because of formal language theory
Funnily, due to the formalization of mathematics, mathematics can be seen as a branch of computer science, just like computer science can be seen as a branch of Mathematics!
Best busy beaver machine known since 1989 as of 2023, before a full proof of all 5 state machines had been carried out.
Paper extracted to HTML by Heiner Marxen: turbotm.de/~heiner/BB/mabu90.html
Cool data embedded in the Bitcoin blockchain Technically interesting ordinal by 
Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01This section is about ordinals that are interesting primarily due to technical reasons linked to edge cases of the protocol.
Interesting MIME types:
- ordinals.com/inscription/dad86d722156b8c384c1f3243e40aa7a0f6f5be496bc24e19485831584f9803fi0: mime type is an UTF-8 orange emoji "🟠"
- ordinals.com/inscription/bc7b86245159cdf8bc63489687909f766a0a0e08279d23fb077cdd60ab1e9f22i0: mime type is an XSS attempt:
<script>alert('xss in content type')</script> tx=bc7b86245159cdf8bc63489687909f766a0a0e08279d23fb077cdd60ab1e9f22 - ordinals.com/inscription/bc7b86245159cdf8bc63489687909f766a0a0e08279d23fb077cdd60ab1e9f22i0: mime type is "FuckYou"
- ordinals.com/inscription/00b0ece72217ce49b637b3f9bf5335bc245e588568aa0676581b40c1bedc521di0: the mime is a long JSON. However, it does appear to be a valid feature as it rendered specially on ordinals.com.
Different
ord markers:- 71e85885522047240a9e70542145dbf2385e1bd468e6ac6002aa755422ea10f5 uses
takingnames. Decode with:gives the PNG of the wireframe draing of a washing machine with transparent background.bitcoin-core.cli decodescript "$(bitcoin-core.cli getrawtransaction 71e85885522047240a9e70542145dbf2385e1bd468e6ac6002aa755422ea10f5 true | jq -r '.vin[0].txinwitness[1]')" | jq -r .asm | sed 's/.* 0 //;s/ OP_ENDIF//;s/ //g' | xxd -r -p > 71e85885522047240a9e70542145dbf2385e1bd468e6ac6002aa755422ea10f5.png
Cool data embedded in the Bitcoin blockchain Largest ordinal inscription by Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01We can get a list of the ordinals at: archive.org/details/bitcoin-ordinal-inscriptions.csv and then sort them by payload size with:
sort -k6 -n -t, ordinals.csv -o ordinals-sort-size.csvThis shows to us that as of block ~831k, there are 4 ordinals which are far far larger than any other between 3 MiB and 4 MiB, at about 10x larger than then 5th one d115a6e689086fd587e5032f24ba2a8c01f2f87cba758c9d5eb8cf7f6e9a816a
In those cases, a single inscription takes almost the entire block, and the inscribers must have had direct dealings with their mining pool:
- ordinals.com/inscription/4af9047d8b4b6ffffaa5c74ee36d0506a6741ba6fc6b39fe20e4e08df799cf99i0: 3,946,469 bytes (image/jpeg). Bitcoin Magazine cover showing the face of Julian Assange. tx 4af9047d8b4b6ffffaa5c74ee36d0506a6741ba6fc6b39fe20e4e08df799cf99 block 786501 (2023-04-22). Mined by Terra Pool.
- ordinals.com/inscription/0301e0480b374b32851a9462db29dc19fe830a7f7d7a88b81612b9d42099c0aei0: 3,915,537 bytes (image/jpeg). Taproot Wizards ad. This was apparently the largest block ever mined at the time: www.reddit.com/r/Bitcoin/comments/10r6t1l/the_first_4_mb_block_in_bitcoin_history_mined_by/ and received some notice. tx 0301e0480b374b32851a9462db29dc19fe830a7f7d7a88b81612b9d42099c0ae block 774628 (2023-02-01). Mined by Luxor pool.
- ordinals.com/inscription/79b91e594c03c8f06d70c44a288a88a413c540abca007829ca119686a7f979dai0: 3,878,842 bytes (image/webp). "Bitcoin War Bonds". A spoof of something. No time to understand now. tx 79b91e594c03c8f06d70c44a288a88a413c540abca007829ca119686a7f979da block 777945 (2023-02-23). Mined by Terra Pool.
- ordinals.com/inscription/b5a7e05f28d00e4a791759ad7b6bd6799d856693293ceeaad9b0bb93c8851f7fi0: 3,379,682 bytes (video/mp4). Short looping video of a "purple frog drinking from a glass with a straw". Yes you heard that right. TODO context? tx b5a7e05f28d00e4a791759ad7b6bd6799d856693293ceeaad9b0bb93c8851f7f block 776884 (2023-02-16 ) Despite being huge, this received very little attention, the only Google mention is at An overview of recent non-standard Bitcoin transactions by 0xB10C. Mined by Terra Pool.
This is notably what the United States emerged to be after World War II. But it was likely what Nazi Germany also was, and many other superpowers.
Ciro Santilli feels that much more relevant would be to also include academia as in "military-industrial-academic" complex, the Wikipedia page actually mentions precedents to this idea.
The addition of congress/politicians is also relevant.
It is basically in this context that American science and technology flourished after World War II, including notably the development of quantum electrodynamics, Richard Feynman being a prototypical example, having previously worked on the Manhattan Project.
For a commented initial example, see: e. Coli K-12 MG1655 gene thrA.
But BioCyc is generally better otherwise.
Cool data embedded in the Bitcoin blockchain Largest text ordinal inscription by Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01
Ciro Santilli 35 Updated 2025-04-24 +Created 1970-01-01Text is the only reasonbly interesting content that Ciro Santilli has seen in the ordinals, as opposed to images which are boring. They haven'g found a way to commercialize it yet it seems, thank God. Glad to have researcehd this a bit!
The largest inscriptions with mime
text/* are:- ordinals.com/inscription/e15e19c587985e7dbb0554a6b51df976fdc8d95f4350b759c10b07399d34a7bbi0: 395,253 bytes (2023-02-23): an English translation of Mein Kampf by Adolf Hitler starting from the "Author's preface" section to the end of Chapter V. This seems to be the text: gutenberg.net.au/ebooks02/0200601.txt gutenberg.net.au/ebooks02/0200601.txt. Likely someone trying to be naughty, on the same vein as the "Hitler did nothing wrong" meme from previous eras
- ordinals.com/inscription/daed32652a82fa809be265a9a082d31e186b2b3c0cec80b52dc30e3c1c856c66i0: 394,346 bytes (2023-02-21): Mein Kempt just like ordinals.com/inscription/e15e19c587985e7dbb0554a6b51df976fdc8d95f4350b759c10b07399d34a7bbi0 but with the HTML in a single line, so it is slightly smaller
- ordinals.com/inscription/95f6909988dba38f1140d536c9cc2fdcf635c1522f93834045b093f0d4c2fdd7i0: 394,053 bytes (2023-02-21): HTML heart shaped index of the "Insignia Art" ordinal collection: ordinalswallet.com/collection/insignia-art. That one is kind of cool actually.
- ordinals.com/inscription/8af62aed75fdd9262d36d428a209a162394f0f463bf261ea253d0fb009f2277fi0: 392,866 bytes (2023-09-29) Majjhima Nikāya (Collection of Middle-length Discourses), Buddhist text that is part of the Pali Canon, the most original Buddhist scriptures. EMBII's inscription of the Bhagavad Gita comes to mind. Both Pali transliteration and English translation are present side-by-side.
- ordinals.com/inscription/6352b23c10ef20321d59735d8597af9be96db1bab4b50d728e618a1c5a21a991i0: 391,053 bytes (2023-03-03) "Satoshi Wars" Star Wars-themed browser game. It is a mouse-controlled Pong clone
- ordinals.com/inscription/ab420f90306948937432379dc3f768ef5f826714f53e0cea4e641debef460173i0: 389,001 bytes (2023-02-19) "The Anarchist Cookbook by William Powell". People trying to be semi-naughty as usual.
- ordinals.com/inscription/d8ef417a8575e0fa3da7ab11f9e91ef7582c7275f54f8b9dc587c98c676bd41ci0: 388,196 bytes (2023-02-12)
This fully on-chain document contains all of Satoshi Nakamoto's posts on Bitcointalk.
- ordinals.com/inscription/2a260692fd8aca7fc5f825fe7965c914615fe1d62f7d3e5b078228d43fd93243i0: 387,818 bytes (2023-04-06) an HTML page, title:It seems t oallow you to upload images and reads metadata from the image. Didn't work too well on ordinals.com possibly due to narrow display port. Also it has a funny background music :-)
Welcome to the on-chain Pixogette Metadata Reader
- ordinals.com/inscription/a31b8e3e279a6e28ef49fa4dca54f820abf266223976b778833e8c47991ad403i0: 386,913 bytes (2023-02-19) a cute Bitcoin Cash ad:It appears to contain the entire first fork block of Bitcoi Cash from mainline bitcoin.
#!/bin/bash # # ____ _ _ _ ____ _ # | __ ) (_) | |_ ___ ___ (_) _ __ / ___| __ _ ___ | |__ # | _ \ | | | __| / __| / _ \ | | | '_ \ | | / _` | / __| | '_ \ # | |_) | | | | |_ | (__ | (_) | | | | | | | | |___ | (_| | \__ \ | | | | # |____/ |_| \__| \___| \___/ |_| |_| |_| \____| \__,_| |___/ |_| |_| # # ___ _ _ # |_ _| _ __ __| | ___ _ __ ___ _ __ __| | ___ _ __ ___ ___ # | | | '_ \ / _` | / _ \ | '_ \ / _ \ | '_ \ / _` | / _ \ | '_ \ / __| / _ \ # | | | | | | | (_| | | __/ | |_) | | __/ | | | | | (_| | | __/ | | | | | (__ | __/ # |___| |_| |_| \__,_| \___| | .__/ \___| |_| |_| \__,_| \___| |_| |_| \___| \___| # |_| # ____ _ _ # | __ ) | | ___ ___ | | __ # | _ \ | | / _ \ / __| | |/ / # | |_) | | | | (_) | | (__ | < # |____/ |_| \___/ \___| |_|\_\ - ordinals.com/inscription/f7ece21e1dc74874d7a6e5e11b77941be2db6f383d053242a40b63e0a28445ffi0: 386,819 bytes (2023-02-18) The Illiad Books I-XII
- ordinals.com/inscription/4f5e52115ef0fb4fc2a18cfc7f4caccfb712792c8bc318e71699a86ba4541719i0: 386,655 bytes (2023-08-09) Frogger browser clone
- ordinals.com/inscription/f04c0e94023e51fb995e48235773c77a471289baf44c1a3248d800a0a550c520i0: 385,743 bytes (2023-03-25) A Roguelike browser game
- ordinals.com/inscription/cd432a3e16c4a01db1df6a59b5941a69bd0cf130b24a61248643005f22a939d9i0: 383,098 (2023-02-18) Brave New World
Wikipedia defines Mind uploading as a synonym for whole brain emulation. This sounds really weird, as "mind uploading" suggests much more simply brain dumping, or perhaps reuploading a brain dump to a brain.
Superintelligence by Nick Bostrom (2014) section "Whole brain emulation" provides a reasonable setup: post mortem, take a brain, freeze it, then cut it into fine slices with a Microtome, and then inspect slices with an electron microscope after some kind of staining to determine all the synapses.
Likely implies AGI.
Pinned article: ourbigbook/introduction-to-the-ourbigbook-project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact