Center for Teaching and Learning, Yale University, New Haven, CT 06520
¶These authors contributed equally to the project and are listed alphabetically. @Kaneb Center for Teaching and Learning, University of Notre Dame, Notre Dame, IN 46556.
We thank all the GTAs and students who participated in this project and Jill Gomolka, Beatrice Frederique, Robert Polacheck, and Chenda Hong for research assistance. This work was supported by National Science Foundation Grant 1140428 to C.M.O. and L.E.H. and a grant from the Howard Hughes Medical Institute to Yale University.