Weird computers have included neurons (a few brain cells from a lamprey, a primitive eel-like vertebrate can be used to control a robot), “gloopware” (interfering waves of propagating ions in a chemical goo behave like a logic gate), slime mold (can work out the shortest route through a maze), and logic circuits that use cascades of atoms bouncing off each other like billiard balls to pass information along their length.