This months series is just excellent. Bryan Caplan another of the economists I follow puts a couple challenging questions to Steve Horwitz who wrote the lead essay.
A great read.
From the Introduction to September 2012's essays:
"Ludwig von Mises's Human Action is still the key summation of the Austrian school of economics. In it, Mises describes certain conclusions, those of praxeology, as having a special epistemological status: They are deductive conclusions that are not subject to falsification. In plain language, they cannot fail to be true: While the findings of history may always be subject to revision—if new evidence is discovered, say, or if old evidence is found to be unreliable—the conclusions of praxeology will always be valid."