I've seen a lot of people fail at trying to prove the earth is round... and others fail at proving it flat.
I grew up believing the round thing and it's hard to imagine that idea being wrong, but anything's possible.
I think radio waves shoot out straight into space and dont bend (much). So, reaching places on the other side of the earth is difficult due to it's round nature.
But I havent tried it.
I guess airplanes dont fly straight over long distances, but instead adjust to the curvature of earth to maximize efficiency. But again, I just take this as truth, I'm not a pilot.
Sometimes I wonder if it matters to me at all.
@mar is going to charter a boat the see the great ice wall one day. Maybe that will tell us something.