Sources & credits.

Each discovery links to the passage supporting it. Our October 2026 catalogue includes excerpts and adaptations from OpenStax textbooks, published by OpenStax at Rice University. These materials come from the editions listed below, released under the Creative Commons Attribution 4.0 International licence.

We selected passages, supplied new titles, shortened some text, and rewrote some explanations for clear, independent reading. OpenStax and the original authors do not endorse Breakfact. The licence applies to the attributed textbook material; it does not imply a licence to unrelated illustrations or trademarks.

Astronomy 2e

OpenStax, Rice University and the authors and contributors identified in the original publication. CC BY 4.0 licence for the source edition.
Source edition: 63157f370b09. Each fact links to its specific publisher paragraph.

Biology 2e

OpenStax, Rice University and the authors and contributors identified in the original publication. CC BY 4.0 licence for the source edition.
Source edition: d2779c2edfb4. Each fact links to its specific publisher paragraph.

World History

OpenStax, Rice University and the authors and contributors identified in the original publication. CC BY 4.0 licence for the source edition.
Source edition: 3e17beda9130. Each fact links to its specific publisher paragraph.

Introduction to Anthropology

OpenStax, Rice University and the authors and contributors identified in the original publication. CC BY 4.0 licence for the source edition.
Source edition: f0f11fc382e1. Each fact links to its specific publisher paragraph.

Psychology 2e

OpenStax, Rice University and the authors and contributors identified in the original publication. CC BY 4.0 licence for the source edition.
Source edition: e061043bf2f9. Each fact links to its specific publisher paragraph.

The original starter collection

The first fourteen discoveries cite Webster’s Unabridged Dictionary and Lewis Carroll’s original text through Project Gutenberg/GITenberg transcriptions, plus the official CPython FAQ. Their individual source links identify the relevant publications. Those materials retain their respective original licences.