I used to think flat-earth is also a viable theory and gave it the benefit of the doubt, but after reading/watching a lot about it and seeing scientists debate over the matter, I think it's safe to say that spherical earth is pretty much proven already, all the scientific facts about it align and compliment each other, while flat earth theory only tries to refute these facts instead of being its own form of science, you can't study it without studying spherical earth in the first place, not to mention it requires you to believe in a convoluted conspiracy.