# History Tracers

History Tracers is a free, open-source educational project that teaches mathematics, science, history, literature and genealogy through culture, games and primary sources. Content is available in English, Spanish and Brazilian Portuguese.

## Explore

- [First steps](https://www.historytracers.org/index.html?page=first_steps_menu): Introductory mathematics for children and beginners.
- [Universe](https://www.historytracers.org/index.html?page=physics): Physics and astronomy lessons.
- [The Origin of Matter](https://www.historytracers.org/index.html?page=chemistry): Chemistry lessons.
- [The Origin of Life](https://www.historytracers.org/index.html?page=biology): Biology lessons.
- [Atlas](https://www.historytracers.org/index.html?page=atlas): Geography, maps and human migration.
- [General History](https://www.historytracers.org/index.html?page=history): History lessons and primary sources.
- [Genealogical Trees](https://www.historytracers.org/index.html?page=families): Family history and genealogy.
- [Understanding texts](https://www.historytracers.org/index.html?page=literature): Literature and reading lessons.
- [Mathematical Games](https://www.historytracers.org/index.html?page=math_games): Free educational games and applications.
- [Gallery](https://www.historytracers.org/index.html?page=gallery): Images and museum collections used in the lessons.

## About

- [About the project](https://www.historytracers.org/index.html?page=class_content&arg=main)
- [Sources](https://www.historytracers.org/index.html?page=class_content&arg=sources)
- [Sitemap](https://www.historytracers.org/sitemap.xml)
- [llms.txt](https://www.historytracers.org/llms.txt)

## License

Software is licensed under GPL-3.0-or-later. Content is licensed under CC BY-NC 4.0 unless stated otherwise. See [Terms and license](https://www.historytracers.org/index.html?page=license).

## Contact

- Email: [contact@historytracers.org](mailto:contact@historytracers.org)
- Contact page: https://www.historytracers.org/index.html?page=contact
- GitHub: https://github.com/historytracers/historytracers