I came across this site in my quest for learning more about quantum mechanics. That lead me to a bunch of on-line videos. Somewhere a long the way I came up with a link to this site. The thinking here is interesting. It has made me take a look at some of my old math and physics books that are still in my bookcase. All I can say is that I will never be able to 'prove' anything to a biased jury. I would never be able to prove to my wife, with just words, that I went to the grocery store. If I produce that quart of milk and a receipt, that's the 'game changer'. The game changer for the round earth folks is the engineering, products, and services that are in everyday use that were developed using the theories of the round earth. If the flat earth folks want to make a real impression, then just use that theory to better what's being done using the round earth model. There are things out there that are limited by the 'curvature of the earth'. If that theory is actually false, don't try to prove that it's false, just develop a product or service that is demonstratively better because of it. Put your theory into action and produce something of value. Then you will get the attention of everyone and most of the arguments will go away and the believers will be flocking towards FET.