This material is based upon work supported by the National Science Foundation under Grant Number 9653194. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. Click the icon for more information about the NSF.   We would also like to express our gratitude for the help and support of Carnegie Mellon's Office of Technology for Education. The OTE provided much-needed technical support, as well as the ongoing use of the Technology Enhanced Learning Laboratory (TELab). For more information on the OTE, go to http://www.cmu.edu/teaching/.   Many thanks to Steve Bajzek of the Bajzek Group, Inc. for his work on the creation of graphics for this site. His time, input, and expertise were much needed and are greatly appreciated. http://bajzek.com   A special thanks to Stephanie Flom for permission to use her Mayfly artwork throughout the site. Please visit http://www.persephoneproject.org to learn more.

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This material is based upon work supported by the National Science Foundation under Grant Number 9653194. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.