Any moron can understand the idea of a round Earth and stuff orbiting around it. It takes a genius to comprehend the sublime intricacies of ether vortex theory which explains how a flat Earth can still permit satellites to stay airborne over the plane.

I've met an extremely intelligent person who was convinced we never landed on the Moon and that Stanley Kubrick faked the whole thing and left clues to this in his production of The Shining. I've also met one who thinks the Nazis invented anti-gravity and are hiding the technology to this day in underground bases in Antarctica and South America.