Credit to the people behind the lessons.
The original simulations were created by Tongjiang Lab . Tài Nguyên Số translates the content, builds the library and adapts the user experience.
Content licence
The original lessons, covers and catalogue are licensed under Creative Commons Attribution–NonCommercial 4.0 International (CC BY-NC 4.0). The translations are shared under the same licence. When redistributing, credit the source, link the licence, identify changes and keep the use noncommercial.
What has changed
The interface and lessons were translated into Vietnamese; a library, search and saved lessons were added; mobile controls were adapted; lighter graphics and a shared Tài Nguyên Số account connection were introduced. Terminology was reviewed and some wording and answers corrected; model-specific values are distinguished from experimental measurements.
Software libraries
Three.js embedded in the simulation files retains its MIT licence. Accompanying licence notices are available in the third-party notices. The library's MIT licence does not replace the CC BY-NC licence of the lesson content.
References
The original source draws on China's upper-secondary curriculum and PEP textbooks. This website is neither part of nor a representative of PEP. Teachers should check learning objectives and scope before using a lesson in class.