>>18062247Humans have been intelligent for a very long time and used sharp sticks for a very long time. Arrowheads are upwards of 70,000 years old, with spears even older than that. Trial and error alone would allow the knowledge of how to fletch an arrow to spread and refine to the feather-ended design most settled with.
Humans can figure out new shit through logic even if they don't know anything to begin with, we're cool like that