The thing I always come back to is Aristotle's belief that if you release an object being circled about your head by rope, it will move perpendicular to the tangent line of the circle. This is trivial to disconfirm by experiment. It moves parallel to the tangent. It's just that science of his school of thought was rationalist. They believed in the power of thought more than the power of experiment. You can surely observe the lifecycle of women and men and see they develop and shed teeth in exactly the same ways and same number, but why bother doing that if you earnestly believe you can just intuit laws of nature purely by thinking really hard?

To be clear, I'm a huge Aristotle fan. He's a towering intellect I will never come close to equaling. His ideas set the stage for very nearly all western thought. It just goes to show that everyone everywhere has deficiencies and blind spots. The smartest person who ever lived can still be wrong in extremely obvious ways in retrospect. Intelligence is no guarantee you're going to actually be right about very much.