Algodoo

Somebody mentioned something about a "gray goo" consisting of nanobots that eventually eat the entire planet while manufacturing more of themselves.

Using the technology I used in my previous "Proliferation" scene, I have created a sort of goo that spreads out over the world and (rather quickly) destroys it by crashing your Algodoo.

Every 3-4 seconds, each box replaces itself with two boxes, with slightly different sizes, colors, and materialVelocities (meaning that they'll slide around on their own at slightly different velocities).

WARNING: This scene causes massive lag if left run too long, and you may have only a few seconds to click the "Undo" button between when you first notice the lag, and when Algodoo crashes.

Edit: Changed the name of this scene to match that of the previous scene.