Imagine thinking you're smart for 2,000 years because nobody bothered to drop two different weights from a tower. Aristotle really said "heavier objects fall faster" and everyone was like "sounds legit" until Galileo finally thought "maybe I should actually check?"
This is why the scientific method exists, folks. Without it, we'd still be believing whatever some bearded dude in a toga declared while munching on grapes. Next time someone tells you something "obvious," remember it took humanity two millennia to figure out gravity doesn't play favorites.