Some lovely little cartoons by the Australian Education people, outlining various aspects of critical thinking and pitfalls therof. I think if everyone on the planet watched and understood these, Alex could shut down the site and go fishing.
http://www.youtube.com/watch?feature=player_embedded&v=iSZ3BUru59A
for the first in the series.
1: Extraordinary claims require extraordinary proof. If it does what it says, you should have no problem with this. 2: What proof will you accept that you are wrong? You ask us to change our mind, but we cannot change yours? 3: It is not our responsibility to disprove your claims, but rather your responsibility to prove them. 4. Personal testamonials are not proof.
What part of ‘meow’ don’t you understand?