A compass proves flat earth.

A few things to mention about this. Globeheads cannot replicate a compass working on a ball, however they sometimes will use a bar magnet to cheat. obviously the globe model claims there's a molten iron core, not a bar magnet. They claim the core is a dynamo which "acts like a bar magnet" lol and no, they can't replicate a molten iron dynamo because iron loses its magnetic properties when heated. The other thing to mention is that globeheads will claim the flat earth model has no south pole.... Why would they make such a ridiculous claim? Are they saying a disk magnet only has one pole?