Everyone complaining or fussing about how primitive this model is on a browser, ya'll need to chill out and stop taking beautiful work like this for granted. Some of you may say this is easy to do or why didn't he also "do this" or "do that" - how about you help out and make it better ;) @sethbannon Thanks for the visuals and hard work!
I think the complaints are fair based on the title of the HN post which indicates that this is a visualization of a biological neural network, which it empathetically is not (it's not a true representation of any kind of neural network, at least not that I know of, but a visualization of graph traversal where the graph happens to look like a brain).
So, it is cool -- extremely pretty -- but fairly misleadingly named in my opinion. It could be more accurately titled, "An artist's rendition of a brain".