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There is no part of this world that is flat; even my driveway is not flat, it has curves and bumps all over it. Flatness only exists as a mathematical postulate, it is impossible to achieve flatness. Who told you the world was flat? Even Hellen Keller could see the world is not flat.

But yes of course I didn't mean hills and valleys. I ment on a infinatley long distance as in not a round ball.