  This paper is the written version of our talk (presented by the second
author) at the IWOTA in Chemnitz in August 2017.
  The meta theorem of the paper is that Halmos' two projections theorem is
something like Robert Sheckley's Answerer: no question about the W*- and
C*-algebras generated by two orthogonal projections will go unanswered,
provided the question is not foolish. An alternative approach to questions
about two orthogonal projections makes use of the supersymmetry equality
introduced by Avron, Seiler, and Simon. A noteworthy insight of the paper
reveals that the supersymmetric approach is nothing but Halmos in different
language and hence an equivalent Answerer.
