== Upanishad dates == 

 The section "in the upanishads" seems to state that the Upanishads were composed in 5000 BC. This contradicts the Upanishad article, and every other dating I have ever seen for the Upanishads. While I would be happy to learn that the Upanishads are of such a grand antiquity, I am quite dubious of the claim. Citations needed!