Hello everybody.
I have been perusing for a while now and I'm extremely curious about this entire movement. I have been trying to keep my mind as open as possible as I always do towards new and interesting things but this particular argument, although I've tried to repeatedly understand it, I cannot comprehend.
I throw this challenge to you, hoping that someone will take their time to reply: convince me that the Earth is indeed flat. I'd like to see evidence, whether scientific, mathematical, physical or simply observational, that we are indeed living on a flat surface.
I would also like to play the role of the devil's advocate and attempt to view the counter arguments and see which one provides the most logical answer.
I will start with a very simple mathematical fact (please correct me if I have interpreted the flat earth theory incorrectly): if indeed the Earth is flat and the edges are a tall ice wall, one has to ask why nobody has ever documented it before, via drone or helicopter or simply going there on a ship and taking photographs. A counter argument here would be that NASA or the UN patrol the seas regularly to intercept anybody who attempts to cross too far, so let's try and prove that there are actual ships out there patrolling

1 - The distance between the North Pole and South America is about 16'200 km. Let's very generously round that to 16'000 km for simplicity's sake. That gives us a circumference of about 100'000 km. That means that whoever patrols the borders would have to patrol one hundred thousand kilometers of freezing cold ocean regularly and never let even a small drone or a tiny boat get past.
2 - Let's assume that it took 1 boat every kilometer to accomplish such a task. We'd be then looking at about 10'000 boats. So whoever is patrolling the borders has ten thousand ships regularly patrolling, which means ten thousand ships with crews on board.
2.5 - Each of these ships would have, say, 20 crew members (again, very generously rounding it). That's 200'000 people. Two hundred thousand people who regularly man these ships. Who are they? Where are they from? Do none of them ever defect?
3 - These ships would require constant maintenance because, as we all know, freezing cold temperatures take a big toll on ships. They would also require an insane amount of fuel for heating and for regular activity. Also all the food the crew members need to eat.
4 - These ships and these people could never possibly work 24/7 every day of the week. At some point, ships need to come and go for repairs. People would have to come home for holidays or simply to see their families. That means another ship has to immediately replace the ones returning, which means more people on these new ships. With what resources and/or shipyards could we ever build so, so, so many ships?
I hope I didn't come off as ironic or arrogant or condescending. I meant none of the sort. I am very genuinely attempting to connect with you all and to understand your view of our Universe. After all, I live here too
