Nonfiction today falls into two broad categories--descriptive and interpretive. There are overlaps and crossovers. Few works are strictly one or the other. The type I have the least problem with are descriptive--long treatises of taxonomy (but not phylogeny), or guidebooks to minerals, rocks, shells, sands, dust, dust mites, 14th century clothes fastening devices--all of these are filled with rich and fascinating information and not really subject to much debate. You might not agree with such and such a taxon or taxonomic division, but it's based in something measurable and debatable. On the interpretive side, however, I find that whenever I finish a book that purports to give me the "history" of anything, I find myself dubious. For example, on the issue of Pope Pius XII, I find it extremely difficult to believe any of the detractors or many of the supporters. I get the sense that the truth, slippery though it may be falls into the cracks between th...