A computer implemented method and apparatus for managing a selection list include accessing previous entries in the history log for a particular field and displaying such entries in a selection list pull-down menu. Such thermoelectric materials and devices may be used to convert thermal energy into electrical energy, or use electrical energy to produce heat or refrigeration. In an embodiment, the electrodes are provided as portions of a removable cartridge cell. A biopsy needle and a method for obtaining a tissue biopsy specimen with the system, are also provided. The infrastructure can self-heal by placing excess static nodes in a hibernating state, and activating those in response to the failure of a nearby static node. The insulative housing defines a longitudinal main body with an inserted groove extending along a longitudinal direction, a pair of latching arms extending forwards from two opposite ends of the main body and a pair of sidewalls respectively positioned outside of the latching arms, each sidewall defines a slot therein.