This collection of recent essays (arranged in order of composition) touches on questions of comparative syntax (including intralanguage comparative syntax), on questions of silent elements (relevant to both syntax and semantics), on questions concerning the relation (or competition) between syntax and morphology.
In some cases, it attempts to ask questions that are not usually asked, e.g., why is it that the human language faculty has a noun-verb distinction?
In all cases, more and more questions need to be asked, if we are to achieve depth of explanation.