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MnemoScience

Science texts, in your memory.

The name is provisional: the trademark search has not been done yet.

MnemoScience is a cartridge for Mnemosyne OS. You choose a field, then a source, then one entry or a whole list. MnemoScience downloads the texts, keeps a copy in your knowledge folder, and writes them into one memory pack per field. Then you ask the chat in your own words: "what is the difference between speed and velocity?", "who was Emmy Noether?". The chat quotes the texts and names their source.

MnemoScience copies texts. It does not check them or rewrite them.

What is in it

Field	Sources
Physics	OpenStax University Physics (3 volumes) and College Physics 2e in English, Física universitaria (3 volumes) in Spanish · Wikipedia · arXiv physics.pop-ph
Chemistry	OpenStax Chemistry 2e and Chemistry: Atoms First 2e, Química 2ed and Química: Comenzando con los átomos 2ed · Wikipedia · arXiv physics.chem-ph
Biology	OpenStax Biology 2e and Concepts of Biology · Wikipedia · arXiv q-bio.PE
Mathematics	OpenStax Calculus (3 volumes) and Cálculo (3 volumes) · Wikipedia · PlanetMath · OEIS · arXiv math.HO
Astronomy	OpenStax Astronomy 2e · Wikipedia · arXiv astro-ph.EP
History of science	Wikipedia · MacTutor biographies · arXiv physics.hist-ph

Wikipedia is offered in English, French and Spanish. It starts on the app's language when it is one of the three. Each field starts on one root category (Category:Physics, Catégorie:Physique, Categoría:Física…); its sub-categories are one click away.

How an entry enters memory

1. MnemoScience reads the entry at its source: an OpenStax module, a Wikipedia page, a PlanetMath entry, a MacTutor biography, an OEIS sequence, an arXiv abstract.
2. The entry becomes one memory, or several parts when it is long (18,000 characters each). Each memory is titled with the source and the entry: OpenStax · Astronomy 2e › Orbits and Gravity · The Laws of Planetary Motion.
3. A source line closes every memory: where the text comes from, its date when the source gives one, its licence in the source's own words, and the address where it can be checked. A date the source does not give is left out. The cartridge never writes today's date in its place.
4. A JSON copy of each entry is written in MnemoScience's folder inside your knowledge folder, filed by field and source, next to an ATTRIBUTION.md. You choose the knowledge folder once, in the Memory Packs tab of the Hub. If it is not chosen yet, the Hub opens on that tab at the first import.

"Put all in memory" resumes where it stopped after a stop, a closed window or a restart. A list that gained entries since (a Wikipedia category, the newest arXiv abstracts) reads only the new ones and keeps its count.

Nothing is written before the saved library is read. If it cannot be read, the screen says so, offers a retry, and no import is possible: writing then would erase every resume point.

Each field is one memory pack: Physics, Chemistry, Biology, Mathematics, Astronomy, History of science. The chat reads a pack when you tick it under Knowledge in the chat's scope.

How the text is read

• Wikipedia is read as HTML (action=parse on the exact revision), never as explaintext, which erases every formula. Each formula is kept as its LaTeX between $…$.
• MacTutor formulas are kept once, as their LaTeX.
• OpenStax MathML becomes one line of linear notation ((Δv)/(Δt)).
• PlanetMath is LaTeX: its structure (bold, links, proofs, lists, sections) becomes text, and every formula stays LaTeX, untouched. An unknown command is left as written.

Where each date comes from

Source	Date in the source line
OpenStax	the repository's last push (GitHub API). Absent when GitHub refuses the call.
Wikipedia	the revision id and timestamp of the page's last revision
PlanetMath	the entry's own \pmmodified
MacTutor	the page's own "Last Update" line (month and year). The host's fetch returns no headers, so Last-Modified cannot be read.
OEIS	the sequence's revision number and time
arXiv	<published> and <updated>

Limits measured on 2026-10-04

• The OEIS shows at most 110 results of a search without an account: start=100 still answers 200, start=110 answers 403. The cartridge stops at 110. Some searches answer null with a 200: no result.
• PlanetMath is no longer updated: most repositories were last pushed in 2018. Opening a class costs one GitHub API request, out of 60 an hour without an account.
• arXiv asks for one request every 3 seconds. The cartridge waits between calls. The arXiv API gives no licence: each article sets its own.
• MacTutor, the OEIS and arXiv send no CORS header. They are read through the host (social.fetch, permission vault:read).
• OpenStax: the repository date costs one GitHub API request per book, out of the same 60 an hour as PlanetMath.

Install

In Mnemosyne OS, open MnemoHub, choose to add an external cartridge, and paste this repository's address.

Develop

This folder is outside the pnpm workspace. Install it on its own:

npm install
npx vite           # serves the cartridge on port 5228
npx vite build     # writes dist/
npx vitest run
npx tsc --noEmit -p tsconfig.eslint.json

The OpenStax module titles ship in src/catalogue/openstax-titles.json, so a book's list can be filtered before anything is read. Rebuild them with node scripts/build-openstax-titles.mjs. The texts themselves are always read live.

Sources and attribution

Each memory names its source and its licence. The attribution of every source is written into the ATTRIBUTION.md of MnemoScience's folder.

• OpenStax (Rice University): licence per book, copied from each collection's md:license. The English 2e books read « Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International ». Física universitaria reads « Creative Commons Attribution License ». The two Química books give only the address http://creativecommons.org/licenses/by/4.0/.
• Wikipedia: « Creative Commons Attribution-Share Alike 4.0 ».
• PlanetMath: « Creative Commons Attribution-ShareAlike 3.0 Unported ».
• MacTutor: « Except where otherwise noted, the text of MacTutor by JOC/EFR is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. »
• OEIS: « Creative Commons Attribution Share-Alike 4.0 license (CC-BY-SA-4.0) ».
• arXiv: licence per article, not given by the API.

Licence

The cartridge's code is under the MIT licence. The texts keep the terms of their sources, listed above.

Where Mnemosyne OS lives

This cartridge runs inside Mnemosyne OS, the sovereign, local-first memory operating system published by XPACEGEMS LLC. Its official addresses:

• Product site: https://mnemosyne-os.io
• Organizations: https://mnemosyne-os.com
• Documentation: https://docs.mnemosyne-os.io
• Host source: https://github.com/Mnemosyne-OS/Mnemosyne-Neural-OS
• Packages: the npm scope @mnemosyne_os

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_{Mnemosyne OS — the sovereign, local-first memory OS this cartridge runs in. Get it at mnemosyne-os.io/download, install cartridges from the built-in MnemoHub store, or build your own.}