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				@@ -321,6 +321,11 @@ 
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				         Node.prototype.onUpdate = function(){ 
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				           // this.p.velocity.multiplyScalar(0.99); 
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				+          if(this.hover || this.opened){ 
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				+            this.p.fixed = true; 
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				+          }else{ 
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				+            this.p.fixed = false; 
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				+          } 
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				           if(this.center) 
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				             this.slowDownNearCenter(); 
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				@@ -530,14 +535,11 @@ 
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				         for (var q = n+1; q < _nodes.length; q++) { 
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				           if(q===n) continue; 
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				- 
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				           // avoid impact between center and aside particules 
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				           if((_nodes[n].center && _nodes[q].aside) || (_nodes[n].aside && _nodes[q].center)) 
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				             continue; 
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				-          // TODO: what if centered nodes are repulsing each other ?? 
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				- 
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				-          margin = _nodes[n].center ? 1 : 1; 
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				+          margin = _nodes[n].center ? 0 : 0; // in px 
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				           // avoid impact between two centered particulses that comes to the center 
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				           if(_nodes[n].center && _nodes[q].center){ 
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				@@ -548,7 +550,7 @@ 
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				           d = _nodes[n].p.distanceTo(_nodes[q].p); 
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				-          full_rad = _nodes[n].r*margin + _nodes[q].r*margin; 
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				+          full_rad = _nodes[n].r + _nodes[q].r + margin; 
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				           // if not colliding skip following 
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				           if(d > full_rad) continue; 
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