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

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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:

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