[lukan]

I recently learned, that the pythagorans were more of a cult (who liked secrecy?). I totally can believe that some ancient math nerds solved lots of things already, but with the people around them not understanding. One war could have been enough, to eradicate lots of (semi) isolated thinkers.

[bluGill]

Every book had to be copied by hand so if it wasn't seen as useful the paper rotted in a few hundred years.