Well I was always just taught that Australia was near the bottom of the Earths sphere, but hey, all those thousands of scientists and physisists must be wrong. Have you ever flown in a plane? The curvature of the Earth is clearly visible... but perhaps this is just an illusion? Or a government consipracy?
Also, do you believe that every other planet is as flat as a pancake too? Do you believe the moon is made of cheese and clouds are made of cotton wool?