Without electronics carrying out computational tasks, our daily lives would look very different. Devices such as elevators, vending machines, turnstiles, washing machines and even traffic lights use a simple form of electronic computing to switch from state to state. But, what if a power supply is not available to operate these devices?Without electronics carrying out computational tasks, our daily lives would look very different. Devices such as elevators, vending machines, turnstiles, washing machines and even traffic lights use a simple form of electronic computing to switch from state to state. But, what if a power supply is not available to operate these devices?[#item_full_content]