  In 2007, and in a series of later papers, Joy Christian claimed to refute
Bell's theorem, presenting an alleged local realistic model of the singlet
correlations using techniques from Geometric Algebra (GA). Several authors
published papers refuting his claims, and Christian's ideas did not gain
acceptance. However, he recently succeeded in publishing yet more ambitious and
complex versions of his theory in fairly mainstream journals. How could this
be? The mathematics and logic of Bell's theorem is simple and transparent and
has been intensely studied and debated for over 50 years. Christian claims to
have a mathematical counterexample to a purely mathematical theorem. Each new
version of Christian's model used new devices to circumvent Bell's theorem or
depended on a new way to misunderstand Bell's work. These devices and
misinterpretations are in common use by other Bell critics, so it useful to
identify and name them. I hope that this paper can serve as a useful resource
to those who need to evaluate new "disproofs of Bell's theorem". Christian's
fundamental idea is simple and quite original: he gives a probabilistic
interpretation of the fundamental GA equation a.b = (ab + ba)/2. After that,
ambiguous notation and technical complexity allow sign errors to be hidden from
sight, and new mathematical errors can be introduced.
