Unless otherwise noted, materials posted on this site can be used by others for non-commercial purposes under a
The materials posted on this website were developed by the Physics and Astronomy Outreach Program at the University of British Columbia. A small amount of material from other sources may be included; in some cases the sources may be unknown. If you believe that a portion of the material is not appropriately attributed or infringes another's copyright, please contact us and we will promptly work to resolve the problem.
Please make attribution as follows:
"C21 Physics Teaching for the 21st Century, University of British Columbia http://c21.phas.ubc.ca"