How can I smooth my meshes? I'm working on smoothing this mesh of a neuron from our lab. I've done Quadratic Edge Collapse Decimation; however, the surface still does not look smooth. Any ideas for how I could fix this? You can download the original mesh here in case it's helpful. It is from research that is not published yet so please don' share it outside this thread. Appreciate any help!
I suggest the Subdivision Surface modifier alongside smooth shading. 

Using the subdivision surface modifier creates additional polygons, which is bad for games.