1 Kip V. Hodges, Foundation Professor, School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA. Hodges is a deputy editor of Science Advances covering earth, space, and environmental science and engineering. Email: [email protected].
2 Harrison H. Schmitt, Associate Fellow, Department of Engineering, University of Wisconsin-Madison, Albuquerque, NM 87199, USA. Schmitt, an Apollo 17 crew member, is the only scientist to date who has performed field work on the Moon. Email: [email protected].