Summer blues are nothing to weep about.  The low bush blueberries are ripening on Burnt Hill. Anthony, Drew and I went picking over at the Benson Place. You can see forever on that hill, even the spires of the University of Massachusetts in Amherst. We picked and picked. For about 15 minutes.  That's as long as it takes two energetic boys with the efficiently designed blueberry rake to pick about 20 pounds of berries, along with a few…