How did the Scientific Revolution change the way people understood the world?

Once upon a time, most people believed they already knew how the universe worked. The answers were written in old books, taught by trusted authorities, and that was that. The Earth sat still in the center of everything, and the heavens were perfect and unchanging. Then, a few stubborn, curious people started asking a dangerous little question: "But how do we actually KNOW?"
For centuries, the rule was simple: if a clever ancient thinker said it, you believed it. Aristotle, who lived nearly two thousand years earlier, was treated almost like a referee whose call could never be questioned. Knowledge flowed downward, from old authorities to everyone else. Looking things up beat looking things up close.
