The one you've been using. The story handed down about the
   innateness of the scientific method, part of the natural
   processes of animals, which began to crystalize in its current
   form when humans began to develop linguistic systems, allowing
   them to pass on knowledge from one generation to the next,
   eventually developing writing systems which allowed knowledge to
   pass on cross multiple generations, and we developed history.
   With history, we no longer had to repeat the errors of the past
   and progressed an inevitable progression into an evolved human
   state of intellect, except for a period of darkness between the
   Ancient Greeks and the Renaissance, culminated in the Age of
   Reason, the dissolution of the religious dominance over society
   and the technicological triumphs of the 20th century.