Simulation by PhET Interactive Simulations, University of Colorado Boulder, licensed under CC BY 4.0 (https://phet.colorado.edu)

The simulations in sims/ are PhET Interactive Simulations' own files,
unchanged, each in the version published before 2026-03-29, which PhET's
agreement for its historical collection of HTML simulations publishes
under the Creative Commons Attribution 4.0 International licence:
https://creativecommons.org/licenses/by/4.0/
https://phet.colorado.edu/en/licensing/html

PhET is a trademark of the Regents of the University of Colorado. Kidux
is not connected with PhET Interactive Simulations. Each simulation's own
About dialog names its authors and the libraries inside it, each under
its own licence.
