Physics textbook: modern perspective, historical approach, algebra based, designed for high school. A preview version is available as a PDF in the release section.
The World is written using the ConTeXt typesetting system, found at:
https://wiki.contextgarden.net/Main_Page
Use the newer LMTX version of ConTeXt.
Contact me if you would like to pilot the text at your school or if you would like to participate in development. I would love to have more collaborators!