Initial funding for the SGM program was provided by HHMI grants (52005202 and 52006315) to Swarthmore College. We thank E. Nichols and P. Borkowski-Valentin for crucial assistance with data analysis; M. Powell for help with figures; and A. Vollmer, B. Davidson, V. Formica, S. Hiebert Burch, N. Kaplinsky, and R. Merz for sharing their challenge questions. We are grateful to C. Hungerford and T. Stephenson and all faculty and laboratory instructors in the Swarthmore College Biology Department for their consistent support for the development, implementation, and assessment of the SGM program.