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Re: Flat earth, seriously?
If the earth was flat, then the shortest distance between two points would be a straight line.
Since the earth is not flat, the shortest distance on a globe is a curved line.
This may not make much of difference on a flight from Detroit to Chicago, but from Chicago to Seoul, it makes a huge difference (a flight I took some 16 years ago). We flew to California, then up the West Coast of North America to Alaska, then came down the East Coast of Asia.
No global navigation since before Columbus would work properly if the earth was flat. There's no massive retaining wall at the edges of the ocean.
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