A method and an apparatus are provided for unlocking an electronic device. An aggregator component can individually control transitioning respective EVs of a set of EVs between a charging state and a not-charging state. An example can include an array of such resonators co-integrated with the interface circuit and configured to detect a mass change associated with one or more of a specified protein binding, a specified antibody-antigen coupling, a specified hybridization of a DNA oligomer, or an adsorption of specified gas molecules. The motor has a rotary member that drives the worm shaft on which a worm and a cam are mounted. Exclusive access of the cache slots is implemented using an atomic compare and swap instruction. The preferred embodiment of this invention is one in which the nail body optionally includes a flat bottom section which includes one or more detachable ringed or recessed sections, said ring sections or recessed sections capable of holding rounded and optionally recessed files andor pumice stones andemery files andor foot scarpers useful in grooming feet.