A ball striking device, such as a golf club head, has a head that includes a face configured for striking a ball and a body connected to the face, the body being adapted for connection of a shaft proximate a heel thereof. For each zone, a target current density is determined, and is modeled after a mathematical series, at least two of which are different. A stabilization of the vertebrae is then achieved using either translaminar facet screw fixation or transfacet pedicle screw fixation. A first notch opens outwardly proximate the first end and a second notch opens inwardly proximate the second end. In the event of a partial or complete failure of data center resources, the standby resources are activated and used to service user requests. Also, a digital projector interface having a switched outlet interface for receiving a signal indicating a condition a switched power outlet and a processor coupled to the switched outlet interface.