Acknowledgments
This paper is dedicated to the memory of David L. G. Noakes (1942 – 2020), scientist, scholar, educator, mentor, collaborator, and friend. We thank Tom Stahl for a review of an earlier draft of this paper. This paper benefitted from discussions with Marc Johnson. Brian Sidlauskas provided recommendations for key literature to use. This paper benefitted from the constructive and critical reviews of two anonymous reviewers.