Computronium refers to material engineered to maximize its use as a computing substrate. It can refer both to advanced hypothetical materials engineered by nanotechnology on the molecular, atomic, or subatomic level, or to contemporary computing materials. Currently our computational devices are relatively large, power-hungry, complex individual devices — microchips. This is a problem, because they are not flexible enough, they are expensive to design and manufacture (a new chip fab plant costs almost $10 billion).