diff --git a/client/html/index.html b/client/html/index.html
index 9dbcba9..0815e42 100644
--- a/client/html/index.html
+++ b/client/html/index.html
@@ -55,12 +55,6 @@
                             <div class="checkbox">
                                 <label><input type="checkbox" id="useRelativeScale" checked="checked">Use relative scale</label>
                             </div>
-                            <div id="history" class="form-group" style="display: none;">
-                                <label for="historyIndex">History</label>
-                                <div class="text-center">
-                                    <input id="historyIndex" style="width: 90%;" type="text" data-slider-reversed="true" data-slider-max="0">
-                                </div>
-                            </div>
                         </div>
                     </div>
                 </div>
diff --git a/client/scripts/application.js b/client/scripts/application.js
index 5ea0318..7941817 100644
--- a/client/scripts/application.js
+++ b/client/scripts/application.js
@@ -22,10 +22,11 @@
 (function(hscd) {
     'use strict';
 
-    var _ctx = { };
+    var _ctx = {};
 
     function onAdjust(name, value) {
         _ctx.query.features[name] = value;
+
         $.getJSON('/search', _ctx.query, function(results) {
             saveSnapshot(results);
             outputSnapshot(results, true);
@@ -34,37 +35,19 @@
 
     function onReady(geo) {
         _ctx = {
-            log: [],
-            geo: geo
+            log:   [],
+            geo:   geo,
+            query: {}
         };
 
-        $('#historyIndex').slider({
-            formatter: function(value) {
-                var delta = _ctx.log.length - (value + 1);
-                switch (delta) {
-                    case 0:
-                        return 'Most recent query';
-                    case 1:
-                        return 'Previous query';
-                    default:
-                        return String(delta) + ' queries back';
-                }
-            }
-        });
+        $('#minScore,#hintSteps,#walkingDist,#maxResults').change(onSearch);
 
-        $.getJSON('/get_parameters', function(parameters) {
-            _ctx.parameters = parameters;
-
-            onSearch();
-
-            $('#minScore,#hintSteps,#walkingDist,#maxResults').change(function() { onSearch(getFeaturesGrapher); });
-            $('#historyIndex').on('slideStop', onSelectSnapshot);
-        });
+        onSearch();
     }
 
-    function onSearch(provider) {
+    function onSearch() {
         _ctx.query = {
-            features:    _clone(_ctx.query.features),
+            features:    _ctx.query.features || {},
             range:       { min: -1.0, max: 1.0 },
             walkingDist: parseFloat($('#walkingDist').val()),
             minScore:    parseFloat($('#minScore').val()),
@@ -79,58 +62,47 @@
             };
         }
 
-        if (!_.has(_ctx, 'grapher')) {
-            _ctx.grapher = new grapher.Grapher({
-                canvas:           new Snap('#svg'),
-                steps:            _ctx.query.hintSteps,
-                range:            _ctx.query.range,
-                onValueChanged:   onAdjust,
-                useLocalScale:    true,
-                useRelativeScale: true
-            });
+        $.getJSON('/search', _ctx.query, function(results) {
+            if (!_.has(_ctx, 'grapher')) {
+                _ctx.grapher = new grapher.Grapher({
+                    canvas:           new Snap('#svg'),
+                    steps:            _ctx.query.hintSteps,
+                    range:            _ctx.query.range,
+                    onValueChanged:   onAdjust,
+                    useLocalScale:    true,
+                    useRelativeScale: true
+                });
 
-            $('#useLocalScale').click(function() {
-                var useLocalScale = $('#useLocalScale').is(':checked');
-                _ctx.grapher.setUseLocalScale(useLocalScale);
-            });
-            $('#useRelativeScale').click(function() {
-                var useRelativeScale = $('#useRelativeScale').is(':checked');
-                _ctx.grapher.setUseRelativeScale(useRelativeScale);
-            });
+                $('#useLocalScale').click(function() {
+                    var useLocalScale = $('#useLocalScale').is(':checked');
+                    _ctx.grapher.setUseLocalScale(useLocalScale);
+                });
 
-            var columns = {};
-            for (var feature in _ctx.query.features) {
-                columns[feature] = {
-                    value: 0.0,
-                    hints: []
-                };
+                $('#useRelativeScale').click(function() {
+                    var useRelativeScale = $('#useRelativeScale').is(':checked');
+                    _ctx.grapher.setUseRelativeScale(useRelativeScale);
+                });
+
+                var columns = {};
+                for (var feature in results.columns) {
+                    var column = results.columns[feature];
+                    _ctx.query.features[feature] = column.value;
+                    columns[feature] = {
+                        value: column.value,
+                        hints: column.hints
+                    };
+                }
+
+                _ctx.grapher.setColumns(columns);
             }
 
-            _ctx.grapher.setColumns(columns);
-        }
-
-        $.getJSON('/search', _ctx.query, function(results) {
             saveSnapshot(results);
             outputSnapshot(results, false);
         });
     }
 
-    function onSelectSnapshot() {
-        var index = $('#historyIndex').slider('getValue');
-        outputSnapshot(_ctx.log[index], false);
-    }
-
     function saveSnapshot(results) {
         _ctx.log.push(results);
-
-        var count = _ctx.log.length;
-        var history = $('#historyIndex').slider();
-        history.slider('setAttribute', 'max', count - 1);
-        history.slider('setValue', count - 1);
-
-        if (count > 1) {
-            $('#history').show();
-        }
     }
 
     function outputSnapshot(results, omitValues) {
@@ -150,24 +122,29 @@
         if (results.length < count) {
             searchResultCnt += ' of ' + count;
         }
-
         $('#resultCount').text(searchResultCnt);
-        $('#resultPanel').slideDown();
 
         var template = Handlebars.compile($('#template').html());
         $('#results').empty();
-        $('#results').append(template({results: results}));
+        $('#results').append(
+            template({ results: results })
+        );
+
+        if (results.length === 0) {
+            $('#resultPanel').slideUp();
+        }
+        else {
+            $('#resultPanel').slideDown();
+        }
     }
 
     $(document).on({
         ajaxStart: function() {
             $('#spinner').show();
         },
-
         ajaxStop: function() {
             $('#spinner').hide();
         },
-
         ready: function() {
             if (navigator.geolocation) {
                 navigator.geolocation.getCurrentPosition(
diff --git a/server/search.js b/server/search.js
index 2dcf006..9ada68c 100644
--- a/server/search.js
+++ b/server/search.js
@@ -32,17 +32,18 @@ var pool   = null;
 function innerProduct(values1, values2) {
     var result = 0.0;
 
-    console.assert(_.keys(values1).length == _.keys(values2).length);
     for (var feature in values1) {
-        result += values1[feature] * values2[feature];
+        if (feature in values2) {
+            result += values1[feature] * values2[feature];
+        }
     }
 
     return result;
 }
 
 function walkMatches(data, features, minScore, callback) {
-    for (var i = 0, count = data.records.length; i < count; ++i) {
-        var record = data.records[i];
+    for (var i = 0, count = data.length; i < count; ++i) {
+        var record = data[i];
         var score  = innerProduct(features, record.features);
 
         if (score >= minScore) {
@@ -62,6 +63,7 @@ function countRecords(data, features, minScore) {
 
 function findRecords(data, features, minScore) {
     var results = [];
+
     walkMatches(data, features, minScore, function(record, score) {
         results.push({
             name:           record.name,
@@ -189,7 +191,27 @@ function computeRecordGeo(records, context) {
     });
 }
 
+function sanitizeQuery(query) {
+    var keys = [
+        'delicious',
+        'accomodating',
+        'affordable',
+        'atmospheric',
+        'nearby',
+        'accessible'
+    ];
+
+    var features = {};
+    _.each(keys, function(key) {
+        features[key] = _.has(query.features, key) ? query.features[key] : 0.0;
+    });
+
+    query.features = features;
+}
+
 function execQuery(query, callback) {
+    sanitizeQuery(query);
+
     var context = {
         geo:         query.geo,
         walkingDist: query.walkingDist * 1000.0