Erratum to: J Sci Educ Technol

DOI 10.1007/s10956-016-9637-1

The original version of this article unfortunately contained a mistake.

Acknowledgments should read:

This material is based upon work supported in part by the National Science Foundation under Grant No. DRL-1031398. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.