The first piece is Lovett’s somewhat facetiously titled "How to Write Something You Don’t Know Anything About."   His concern here is how a writer should present speculative science and technology in their story.  In brief, Lovett suggests that a writer do their homework; figure out how much they and their readers need to know (not always the same thing); and then present that material as concisely as possible.  This is, of course, the kind of thing you would be advised to do in any writing course, but Lovett has a good eye for the application of these general principles to the problems involved in writing hard science fiction.