Terms of use
A directory, not a shop. Nothing on this domain takes a payment, and every purchase link hands you to somebody else.
Where the money happens
Books go to Amazon. Kits go to StealthFyre. Tea goes to Black Timber Apothecary's storefront. Software goes to its own site or to GitHub. Each of those runs its own checkout under its own terms, and any order, payment, delivery or refund is governed there rather than here. There are no affiliate links on this site.
The writing and the work
The text, the photography and the design on this domain are mine. Quote it with attribution and link back. Don't republish a page wholesale or pass the work off as your own. The published books are under their own copyright at their publisher, and the research papers under whatever licence each one names.
Project descriptions
Every project card describes what the thing does today, and some of those things are half-built and say so. A description here isn't a warranty, a specification, or a promise that something ships. Status labels change without notice, because the projects do.
The notify list
One email per volume, nothing else, unsubscribe in one click. That's the whole promise and it's deliberately narrow so it can be kept.
No warranty
The site is offered as it is. Where the law permits limiting liability, mine for anything arising from your use of it is limited to what you paid for access, which is nothing. This doesn't affect your statutory rights, or liability for death or personal injury caused by negligence.
Changes and law
These terms change as the projects do, and the date below moves with them. Montana law governs. ryan@ryan-heltemes.com.
Last updated 13 September 2026. See also the privacy page.