How the "Noah's Ark" Story Started (Score 0, Flamebait)

A long time ago, in a country far far away... (if you live in the U.S. anyway :).

Some young kid asked his Father or Grandfather the story-teller (or Keeper of the Truth) what a Rainbow was. Of course, the teller had no idea, so they started a story. Perhaps it was a story about a flood they heard about or remembered; or perhaps they were very spiritual (or perhaps just mental as many religious figures have been thru the ages) and they said it was some kind of promise from GOD.

Anyway, as stories always do, it grew and grew (and probably merged with other "great flood" myths) and eventually became the story of Noah's Ark.

btw, you can use the same logic to figure out where many of the stories / rules came from in the Bible / Qur'an / whatever particular ancient religious text you care to name.