Lee, Andrew G.
Article History
Received: 13 January 2021
Revised: 14 January 2021
Accepted: 14 January 2021
First Online: 29 January 2021
Compliance with ethical standards
:
: AGL works as a consultant for the United States National Aeronautics and Space Administration (NASA) but the views expressed here are solely those of the author and do not necessarily reflect the views of NASA or the United States government. No conflicts of interest to declare and no funding sources.
Free to read: This content has been made available to all.