Hello,
While reading this forum, I noticed that many of troll claim always the same thing : we don't have "proofs" that the earth is flat. Therefore, I thought that one solution would be to make a real travel to the edge of the Earth and take picture and other "scientific proofs" that this edge is real. However, many people today will just say that the earth is not flat because of social pressure and would feel ashamed to say it's not rounded. Crowdfunding (like Kickstarter) allow them to give money in anonymously. Some projects are given many billions of dollars, so it's totally possible.
Of course, such an expedition would be very hard to prepare, so for now it's just an idea. What do you think about it?