- Known Source: all the knowledge has a known source, that can be freely referred to in order to trust or not the knowledge
  - Easy to trust: all supernatural claims have to be subjected to independent scrutiny. [[http://www.randi.org/site/index.php/1m-challenge.html|The 1M JREF challenge]] seems to have acceptable criteria for supernatural.
  - Free (as in free beer): All knowledge is available to the world at no charge.
  - Rationalistic: All knowledge must be subjected to the rules of logic and the burden of proof.