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A massively-parallel computing device made from supersaturated solutions of sodium acetate? The basic idea is to use the wavefront of crystallization to perform calculations; the speed of the wavefront through the solution and the way it interacts with other wavefronts performs calculations.
A computer made entirely of sodium acetate, known as hot ice, solves mazes and other problems. It also occasionally hangs. If you've ever used a chemical hand warmer, you'll be familiar with sodium acetate. These bags of liquid are supersaturated solutions of sodium acetate that has supercooled to ambient temperature. Clicking a metal disc in the solution creates a nucleation center that causes the solution to rapidly crystallize, releasing heat. Heating the solid turns it back into a liquid, thereby recharging the hand warmer.