Carl Sagan was lucky to work in the sciences, where everything was black or white, true or false, or existing or not existing. Establishing fact is boring, and practically irrelevant in the real world. I would like to see how good Sagan would be at being a defense lawyer or politician for example. I would like to see how well he moves from mere fact to action, consensus, justice, emotional soundness, and understanding.
QUOTE (DrivinWest @ Jul 28 2006, 1:48 pm)

There is no evidence that leprechauns exists, but saying that they might due to no evidence that they do not exist is an argument that appeals to ignorance.
I think you misinterpreted this statement:
QUOTE (DrivinWest @ Jul 28 2006, 11:03 am)

Appeal to ignorance (absence of evidence is not evidence of absence).
Surely as far as the leprechaun goes, the appeal to ignorance is trying to claim that leprechauns definitivly dont exist simply because there is no evidence they dont exist.
If as you say, the appeal to ignorance was trying to claim leprechauns MIGHT exist because no evidence exists that they dont, then the phrase above would read "absense of evidence IS evidence of absence" which is clearly absurd. As it is, claiming leprechauns MAY exist despite there being no evidence is a sound argument.