Next Monday is Labor Day. We think of this annual national holiday mostly as a "last hurrah" for summertime.  Gatherings centered on barbecue-and-beer, a final weekend at the beach, the day before school starts, etc.  The brief pause of Labor Day signals a segue' in tempo: from long, lazy vacay-days to shorter, stricter school-days; a syncopated downbeat before the pace picks up double-quick.