I recently dove into such a book, In Search of Now: The Science of the Present Moment. That’s when you’re deeply engaged in some challenging activity, so single-mindedly focused, in fact, that time seems to stop. Our brains construct a version of when “now” is, of when exactly the present moment exists. In a way, you’re stretching out your experience of “now,” which is really the only place anything real can happen. We probably would have had fewer arguments if we had understood on a gut level that such varied ways of understanding “now” are equally valid.