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Curriculum materials on this site are licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License subject to the following additional terms. The CT-STEM website and curriculum materials are distributed free of charge for non-commercial educational use. For any other uses of this website and materials, in original or modified form, including but not limited to distribution in whole or in part, specific prior permission must be obtained from the CT-STEM Project Investigators. The website and curriculum materials shall not be used, rewritten, or adapted as the basis of a commercial software product or as part of course materials that are licensed or sold commercially without first obtaining appropriate licenses from Northwestern University. We make no representations about the suitability of this website for any purpose. It is provided "as is" without express or implied warranty.

This work is supported by the National Science Foundation under NSF Grants CNS-1138461 and CNS-1441041 and by the Spencer Foundation. However, any opinions, findings, conclusions, and/or recommendations are those of the investigators and do not necessarily reflect the views of the funders.