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Also, it feels like global infrastructure has diverged except for some aspects of mobile phone use (global apps like uber or google maps). This adds to the space-travel like feeling of foreign travel. ATMs, public transport UX, coffee machines... everything has diverged more.
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Jet lag has gotten gradually worse for me with age. Pro: international travel increasingly feels like I think space travel would. Strong sense of the earth as a planet spinning around. Con: It really sucks to be chronobiologically out of sorts for days.