omg, defcon, you can end this once and for all! Well, if the pictures haven't proven anything. I am quite sure that if you take two compasses, take them to a flat-ish area where there isn't a lot of metal stuff to screw with them, and you place them far enough away from eachother so their magnetic fields don't interfere with eachother, and you take very careful measurements, you should find, if the earth is round, that the north needles point away from eachother, and if it is a flat earth, they will point towards eachother. Of course it might only be, like, a couple degrees, but maybe you're super good at measuring stuff.
oh yeah, you have to make sure they are each directly east and west of eachother, and I mean exactly.
btw, someone said Einsteins gravity was the whole things fall to the earth stuff, and Newton was the whole all mass is attracted. I thought they both believed in the same theory or, if anything, it would be Einstein who believes in the attraction of all mass, what with him having all those thoughts about the universe and Newton doing all that stuff with more localized physics.