Broken Indigenous Technological Succession

This is actually a very personal one, because I know that even before the British colonized my nation, Nigeria, people figured out how to survive. People knew that when dangerous snakes bite people, there were locals, indigenous people, who knew the right leaves, herbs, to use to cure the snake bites. There were women who could deliver babies right in the farm. There was no hospital, they were not trained in any clinic. But they have figured, after years and centuries, they knew the right herbs to give the woman upon delivery.