This is for my Australians and New Zealanders [astronomy lulz]

"Even those who could accept the sphericity of the Earth [in late antiquity and the early Middle Ages] often had problems with the existence of people at the antipodes. Frequently, those who grudgingly admitted this last possibility were inclined to add that such beings would not be descended from Adam, would be beyond redemption, and by walking with their heads below their feet would be incapable of rational thought."

- my cosmology textbook.