Does your argument make sense? We'll map out common errors like “post hoc ergo propter hoc.” "Truth isn't truth!" Rudy Giuliani recently asserted in defense of his client Donald Trump. In an era when so many people are insisting the anything they believe or say is just as valid as anything anyone else might say, society sometimes seems to have lost track of basic rules of logic. Our presentation tonight will offer a refresher course, mapping out common logical errors from the law of non-contradiction (which Giuliani lost track of) to old favorites like “post hoc ergo propter hoc.”