The science that studies the principles of valid reasoning and argument

Reference

Logic - Wikipedia, the free encyclopedia
"Logic, from Classical Greek ... logos, originally meaning the word, or what is spoken, (but coming to mean thought or reason) is most often said to be the study of criteria for the evaluation of arguments, although the exact definition of logic is a matter of controversy among philosophers. However the subject is grounded, the task of the logician is the same: to advance an account of valid and fallacious inference to allow one to distinguish good from bad arguments. Traditionally, logic is studied as a branch of philosophy. ..."

Articles

The Myth of the Rational Voter, by Bryan Caplan, Cato Unbound, 6 Nov 2006
Posits that voters mistaken beliefs, in particular about economics, do not "cancel each other out" but instead they compound
"... irrationality, like ignorance, is sensitive to price, and false beliefs about politics and religion are cheap. If you underestimate the costs of excessive drinking, you can ruin your life. ... if you underestimate the benefits of immigration ... what happens to you? In all probability, the same thing that would have happened to you if you knew the whole truth."

Cartoons and Comic Strips

What's the Secret to Success as a TV Pundit?, by Wiley Miller, Non Sequitur, 2 Aug 2008
You're Watching a News Discussion Program?, by Wiley Miller, Non Sequitur, 31 Jul 2008

Books

The Art of Reasoning
    by David Kelley, 1988