Pythagoras, Plato, Aristotle, completely different constellations on each side of the globe. Fuck just saying. I literally cant believe how stupid people are. Look at it like this. I think I'm pretty dumb. I have two engineering degrees, one postgrad. So I am not in lower percentile and am still not too sharp really. Minimally, over 50% of the population (the below average proportion - actually considering a gaussian distribution it is gonna be more like 32%) are literally barely capable of complex analytical thought (calculus, for example), so the observational aspect of a flat earth phenomenon combined with a complete lack of objective experimental experience just kind of rolls them into the gutter of human potential.