Random Turing machine simulator

This is really cool (the link goes to a configuration I like a lot, but you can randomly generate your own as well).

Here are some more I like: this, this, this, this, this, this, this!, this, this.  This.  This, this, this.

There's a thin range between excessive order and sheer chaos that makes the best patterns.

Econophysics

Did you know econophysics existed? I didn't, but now I want to be an econophysicist when I grow up. It involves the study of large populations of (simulated) actors in an economic framework, like this: cartels are an epiphenomenon.

So cool!