diff --git a/panoramix/data/__init__.py b/panoramix/data/__init__.py
index 1c1eb3cf0e96d..a6090e2c4693e 100644
--- a/panoramix/data/__init__.py
+++ b/panoramix/data/__init__.py
@@ -75,7 +75,7 @@ def load_world_bank_health_n_pop():
     obj = db.session.query(TBL).filter_by(table_name=tbl).first()
     if not obj:
         obj = TBL(table_name='wb_health_population')
-    obj.main_dttm_col = 'ds'
+    obj.main_dttm_col = 'year'
     obj.database = get_or_create_db(db.session)
     models.Table
     db.session.add(obj)
diff --git a/panoramix/static/widgets/viz_nvd3.js b/panoramix/static/widgets/viz_nvd3.js
index d6a3cf7502fb7..ce7f3db2e3a7e 100644
--- a/panoramix/static/widgets/viz_nvd3.js
+++ b/panoramix/static/widgets/viz_nvd3.js
@@ -28,6 +28,8 @@ function viz_nvd3(slice) {
       var data = payload.data;
       var viz = payload;
       var viz_type = viz.form_data.viz_type;
+      var fd = viz.form_data;
+      var f = d3.format('.4s');
       nv.addGraph(function() {
         if (viz_type === 'line') {
           if (viz.form_data.show_brush) {
@@ -106,10 +108,25 @@ function viz_nvd3(slice) {
           chart.yAxis.tickFormat(d3.format('.3p'));
 
         } else if (viz_type === 'bubble') {
+          var row = function(col1, col2){
+            return "<tr><td>" + col1 + "</td><td>" + col2 + "</td></r>"
+          }
           chart = nv.models.scatterChart();
+          chart.showDistX(true);
+          chart.showDistY(true);
           chart.xAxis.tickFormat(d3.format('.3s'));
           chart.yAxis.tickFormat(d3.format('.3s'));
-          chart.showLegend(viz.form_data.show_legend);
+          chart.showLegend(fd.show_legend);
+          chart.tooltip.contentGenerator(function (obj) {
+            p = obj.point;
+            var s = "<table>"
+            s += '<tr><td style="color:' + p.color + ';"><strong>' + p[fd.entity] + '</strong> (' + p.group + ')</td></tr>';
+            s += row(fd.x, f(p.x));
+            s += row(fd.y, f(p.y));
+            s += row(fd.size, f(p.size));
+            s += "</table>";
+            return s;
+          });
           chart.pointRange([5, 5000]);
 
         } else if (viz_type === 'area') {
diff --git a/panoramix/viz.py b/panoramix/viz.py
index 27f5b5c1901a8..1c25b01618f97 100644
--- a/panoramix/viz.py
+++ b/panoramix/viz.py
@@ -472,8 +472,8 @@ class BubbleViz(NVD3Viz):
         'fields': (
             ('since', 'until'),
             ('series', 'entity'),
-            ('x', 'y'),
-            ('size', 'limit'),
+            'x', 'y', 'size',
+            'limit',
             ('x_log_scale', 'y_log_scale'),
             ('show_legend', None),
         )