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This website is supported by National Science Foundation Grants, DUE-0535903, DUE-0815135, and DUE-0814373 to Morehouse College and Emory University, Atlanta, Georgia, USA. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessary reflect the views of the National Science Foundation, Emory University, or Morehouse College. Copyright © by Lawrence S. Blumer and Christopher W. Beck, 2008-2014. All rights reserved. The content of this site may be freely used for non-profit educational purposes, with proper acknowledgement of the source. All other uses are prohibited without prior written permission from the copyright holders.