var skip = (page * show) - show;
  var limit = skip + show;
  db.collection('blog').aggregate([
       {$project: {things: 1, date: 1}},
       {$sort:{"date": -1}},
       {$limit: limit},
       {$skip: skip}
  ],function(err, result) {
       if (err) throw err;
       res.send(result)
  });