PhET under CC-BY PhET Interactive Simulations, University of Colorado Boulder. PhET® is a registered trademark owned by the Regents of the University of Colorado, a body corporate, and is being used under license. The University is not affiliated with and does not endorse Kiwix or any of its sponsors.
José Porras (2)
Simon Goodall (2)
Taipei Medical University FLYoung International Service
A. Kauffeld from USAID (public domain)
North Korea photo © Jung Kwang-Il, courtesy of NKSC
Homepage key visual by StockSnap (CC0 license)