I'm guessing it comes from people who have never been in an airplane, on a very ...

grawprog on March 15, 2019 | parent | context | favorite | on: Reddit Has Become a Battleground of Alleged Chines...

I'm guessing it comes from people who have never been in an airplane, on a very tall mountain or in open prairies. Ya know...all those places you can actually see the Earth curve at the horizon...