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Unless otherwise noted, materials posted on this site can be used by others for non-commercial purposes under a

Creative Commons Attribution-Noncommercial 3.0 Unported License .

The materials posted on this website were developed by the Science Education Initiatives at the University of British Columbia (CWSEI) and the University of Colorado (CU-SEI). 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.