> A walk in the woods, a pithy tweet, an encouter (a dialog 
  >  -- a communiation -- a discussion -- an interaction --
  > an intercourse) with another human (fucking) being can
  > also provide that eureka moment.

Eureka moments are when the new bridge has been built in your brain. Reading is one (and one of the most potent) of the things what creates columns on which this bridge lays.