Good point. One nit though: >So there have only been rich travelers for the latest 0.15% of human history I would prefer the phrase "human existence" here bec

Good point. One nit though: >So there have only been rich travelers for the latest 0.15% of human history I would prefer the phrase "human existence" here because in the social sciences, prehistory ends and history begins when the society or region in question acquires people who know how to write, so for example the history of Scandinavia begins around 800 AD.