On Sun, 17 Jun 2007, C.J. Croy wrote:
It does not say "If the article says the sky is blue, you need a source". Policy is that if something is challenged or likely to be challenged, THEN you need a source. Get that? Sourcing for non-controversial facts really is optional.
It's optional until someone comes along and challenges the non-controversial fact insincerely. It's often used as a way to kill an article, and sometimes as a tool of vandals who find they can cause disruption merely by forcing people to run around sourcing that the sky is blue.