I marked this video to Watch Later. I can't remember who suggested it, and can't find the comment. If anyone knows who originated this video, please let me know; I want to give that person attribution.
Pat recommended The Man From Earth to me in another conversation on here. It. Is. EXCELLENT.
@Loren, thanks for identifying Pat as the original poster of "The Man from Earth".
@Pat, I watched the film and it is an excellent thought experiment, one that set my imagination soaring. Thanks for the lead.
Thank you Joan. Quite a brain teaser to watch at 4:00 AM!