So far, the most interesting thing I've read in it (which is not to say that the meat of the essay isn't interesting) is that J.P. Sousa testified in Congress (in 1927 or '28, as it turns out) and used the idea that man evolved from apes as an unquestioned fact and expected his audience to agree with him. Keep in mind that the State (of Tennessee) v. Scopes decided against evolution in 1925. (Sort of.)