 As discussed already in  Section 5.2  and  Section 5.3,  it is the addition of quantum field theory to general relativity that definitively settles the issue of the thermodynamical character of black holes. There are, however, many other fascinating phenomena that arise when one adds quantum field theory to the mix of black holes and singularities, and general relativity in general, than just that, and a concomitant broadening and deepening of the philosophical issues and puzzles that confront us. 