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http://www.lhup.edu/~dsimanek/quack.htm

In this article, I will first list some of these evidential flaws and then
discuss errors in relating evidence to theory. Of necessity, this is a short
list that omits most such problems. It is largely biased by what I have seen
in newsgroup discussions. (A true survey would require a book, of the order
that David Fischer wrote for historians.) Finally, I will discuss when mere
mistakes (which plague every research direction) turn into quackery.

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/arcana